如何下载swift中的文件？
How to download file in swift?
我刚开始学习来自 android 的 iOS 的苹果 swift 编程。我现在基本上可以阅读和操作 swift 代码，还学习了一些在 iOS swift 编程中使用的常见 类，但仍然对语法和所有内容感到困惑。
我正在尝试下载文件。就像，让我们说来自这个 URL
var url = "http://www.mywebsite.com/myfile.pdf"
点击按钮。也许视觉上也有进步
通过在 Whosebug 中搜索，我偶然发现了 Alamofire。我可能会尝试，但我不确定这是否是最适合我的方法。
所以，我想问一下我有哪些选择（iOS7 和 iOS8）来实现我的目标。还有，pros and cons会很棒！
示例下载器 class 没有 Alamofire：
class Downloader {
class func load(URL: NSURL) {
let sessionConfig = NSURLSessionConfiguration.defaultSessionConfiguration()
let session = NSURLSession(configuration: sessionConfig, delegate: nil, delegateQueue: nil)
let request = NSMutableURLRequest(URL: URL)
request.HTTPMethod = "GET"
let task = session.dataTaskWithRequest(request, completionHandler: { (data: NSData!, response: NSURLResponse!, error: NSError!) -> Void in
if (error == nil) {
// Success
let statusCode = (response as NSHTTPURLResponse).statusCode
println("Success: \(statusCode)")
// This is your file-variable:
// data
}
else {
// Failure
println("Failure: %@", error.localizedDescription);
}
})
task.resume()
}
}
这是在您自己的代码中使用它的方法：
class Foo {
func bar() {
if var URL = NSURL(string: "http://www.mywebsite.com/myfile.pdf") {
Downloader.load(URL)
}
}
}
Swift 3 版本
另请注意将大文件下载到磁盘上而不是内存中。参见`downloadTask:
class Downloader {
class func load(url: URL, to localUrl: URL, completion: @escaping () -> ()) {
let sessionConfig = URLSessionConfiguration.default
let session = URLSession(configuration: sessionConfig)
let request = try! URLRequest(url: url, method: .get)
let task = session.downloadTask(with: request) { (tempLocalUrl, response, error) in
if let tempLocalUrl = tempLocalUrl, error == nil {
// Success
if let statusCode = (response as? HTTPURLResponse)?.statusCode {
print("Success: \(statusCode)")
}
do {
try FileManager.default.copyItem(at: tempLocalUrl, to: localUrl)
completion()
} catch (let writeError) {
print("error writing file \(localUrl) : \(writeError)")
}
} else {
print("Failure: %@", error?.localizedDescription);
}
}
task.resume()
}
}
这是一个说明如何进行同步和异步的示例。
import Foundation
class HttpDownloader {
class func loadFileSync(url: NSURL, completion:(path:String, error:NSError!) -> Void) {
let documentsUrl = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first as! NSURL
let destinationUrl = documentsUrl.URLByAppendingPathComponent(url.lastPathComponent!)
if NSFileManager().fileExistsAtPath(destinationUrl.path!) {
println("file already exists [\(destinationUrl.path!)]")
completion(path: destinationUrl.path!, error:nil)
} else if let dataFromURL = NSData(contentsOfURL: url){
if dataFromURL.writeToURL(destinationUrl, atomically: true) {
println("file saved [\(destinationUrl.path!)]")
completion(path: destinationUrl.path!, error:nil)
} else {
println("error saving file")
let error = NSError(domain:"Error saving file", code:1001, userInfo:nil)
completion(path: destinationUrl.path!, error:error)
}
} else {
let error = NSError(domain:"Error downloading file", code:1002, userInfo:nil)
completion(path: destinationUrl.path!, error:error)
}
}
class func loadFileAsync(url: NSURL, completion:(path:String, error:NSError!) -> Void) {
let documentsUrl = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first as! NSURL
let destinationUrl = documentsUrl.URLByAppendingPathComponent(url.lastPathComponent!)
if NSFileManager().fileExistsAtPath(destinationUrl.path!) {
println("file already exists [\(destinationUrl.path!)]")
completion(path: destinationUrl.path!, error:nil)
} else {
let sessionConfig = NSURLSessionConfiguration.defaultSessionConfiguration()
let session = NSURLSession(configuration: sessionConfig, delegate: nil, delegateQueue: nil)
let request = NSMutableURLRequest(URL: url)
request.HTTPMethod = "GET"
let task = session.dataTaskWithRequest(request, completionHandler: { (data: NSData!, response: NSURLResponse!, error: NSError!) -> Void in
if (error == nil) {
if let response = response as? NSHTTPURLResponse {
println("response=\(response)")
if response.statusCode == 200 {
if data.writeToURL(destinationUrl, atomically: true) {
println("file saved [\(destinationUrl.path!)]")
completion(path: destinationUrl.path!, error:error)
} else {
println("error saving file")
let error = NSError(domain:"Error saving file", code:1001, userInfo:nil)
completion(path: destinationUrl.path!, error:error)
}
}
}
}
else {
println("Failure: \(error.localizedDescription)");
completion(path: destinationUrl.path!, error:error)
}
})
task.resume()
}
}
}
以下是如何在您的代码中使用它：
let url = NSURL(string: "http://www.mywebsite.com/myfile.pdf")
HttpDownloader.loadFileAsync(url, completion:{(path:String, error:NSError!) in
println("pdf downloaded to: \(path)")
})
只要您的应用程序在前台运行，Devran 和 djunod 的解决方案就可以正常工作。如果您在下载过程中切换到另一个应用程序，则会失败。我的文件大小约为 10 MB，下载需要一些时间。所以我需要我的下载功能即使在应用程序进入后台时也能正常工作。
请注意，我在 "Capabilities" 开启了 "Background Modes / Background Fetch"。
由于不支持完成处理程序，因此未封装解决方案。抱歉。
--Swift 2.3--
import Foundation
class Downloader : NSObject, NSURLSessionDownloadDelegate
{
var url : NSURL?
// will be used to do whatever is needed once download is complete
var yourOwnObject : NSObject?
init(yourOwnObject : NSObject)
{
self.yourOwnObject = yourOwnObject
}
//is called once the download is complete
func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didFinishDownloadingToURL location: NSURL)
{
//copy downloaded data to your documents directory with same names as source file
let documentsUrl = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first
let destinationUrl = documentsUrl!.URLByAppendingPathComponent(url!.lastPathComponent!)
let dataFromURL = NSData(contentsOfURL: location)
dataFromURL?.writeToURL(destinationUrl, atomically: true)
//now it is time to do what is needed to be done after the download
yourOwnObject!.callWhatIsNeeded()
}
//this is to track progress
func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64)
{
}
// if there is an error during download this will be called
func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?)
{
if(error != nil)
{
//handle the error
print("Download completed with error: \(error!.localizedDescription)");
}
}
//method to be called to download
func download(url: NSURL)
{
self.url = url
//download identifier can be customized. I used the "ulr.absoluteString"
let sessionConfig = NSURLSessionConfiguration.backgroundSessionConfigurationWithIdentifier(url.absoluteString)
let session = NSURLSession(configuration: sessionConfig, delegate: self, delegateQueue: nil)
let task = session.downloadTaskWithURL(url)
task.resume()
}
}
下面是如何调用 --Swift 2.3--
let url = NSURL(string: "http://company.com/file.txt")
Downloader(yourOwnObject).download(url!)
--Swift 3--
class Downloader : NSObject, URLSessionDownloadDelegate {
var url : URL?
// will be used to do whatever is needed once download is complete
var yourOwnObject : NSObject?
init(_ yourOwnObject : NSObject)
{
self.yourOwnObject = yourOwnObject
}
//is called once the download is complete
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL)
{
//copy downloaded data to your documents directory with same names as source file
let documentsUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first
let destinationUrl = documentsUrl!.appendingPathComponent(url!.lastPathComponent)
let dataFromURL = NSData(contentsOf: location)
dataFromURL?.write(to: destinationUrl, atomically: true)
//now it is time to do what is needed to be done after the download
yourOwnObject!.callWhatIsNeeded()
}
//this is to track progress
private func URLSession(session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64)
{
}
// if there is an error during download this will be called
func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?)
{
if(error != nil)
{
//handle the error
print("Download completed with error: \(error!.localizedDescription)");
}
}
//method to be called to download
func download(url: URL)
{
self.url = url
//download identifier can be customized. I used the "ulr.absoluteString"
let sessionConfig = URLSessionConfiguration.background(withIdentifier: url.absoluteString)
let session = Foundation.URLSession(configuration: sessionConfig, delegate: self, delegateQueue: nil)
let task = session.downloadTask(with: url)
task.resume()
}}
下面是如何调用 --Swift 3--
let url = URL(string: "http://company.com/file.txt")
Downloader(yourOwnObject).download(url!)
如果您只需要将文本文件下载到 String 中，您可以使用这种简单的方法，Swift 5:
let list = try? String(contentsOf: URL(string: "https://example.com/file.txt")!)
如果您需要非可选结果或错误处理：
do {
let list = try String(contentsOf: URL(string: "https://example.com/file.txt")!)
}
catch {
// Handle error here
}
你应该知道网络操作可能需要一些时间，为了防止它在主线程中 运行 并锁定你的 UI，你可能希望异步执行代码，例如：
DispatchQueue.global().async {
let list = try? String(contentsOf: URL(string: "https://example.com/file.txt")!)
}
Swift 3
class ViewController: UIViewController {
var urlLink: URL!
var defaultSession: URLSession!
var downloadTask: URLSessionDownloadTask!
}
// MARK: Button Pressed
@IBAction func btnDownloadPressed(_ sender: UIButton) {
let urlLink1 = URL.init(string: "https://github.com/VivekVithlani/QRCodeReader/archive/master.zip")
startDownloading(url: urlLink!)
}
@IBAction func btnResumePressed(_ sender: UIButton) {
downloadTask.resume()
}
@IBAction func btnStopPressed(_ sender: UIButton) {
downloadTask.cancel()
}
@IBAction func btnPausePressed(_ sender: UIButton) {
downloadTask.suspend()
}
func startDownloading (url:URL) {
let backgroundSessionConfiguration = URLSessionConfiguration.background(withIdentifier: "backgroundSession")
defaultSession = Foundation.URLSession(configuration: backgroundSessionConfiguration, delegate: self, delegateQueue: OperationQueue.main)
downloadProgress.setProgress(0.0, animated: false)
downloadTask = defaultSession.downloadTask(with: urlLink)
downloadTask.resume()
}
// MARK:- URLSessionDownloadDelegate
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
print("File download succesfully")
}
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
downloadProgress.setProgress(Float(totalBytesWritten)/Float(totalBytesExpectedToWrite), animated: true)
}
func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
downloadTask = nil
downloadProgress.setProgress(0.0, animated: true)
if (error != nil) {
print("didCompleteWithError \(error?.localizedDescription)")
}
else {
print("The task finished successfully")
}
}
使用URLSessionDownloadTask在后台下载文件，这样即使应用终止也能完成。
有关详细信息，请参阅：
https://www.ralfebert.de/snippets/ios/urlsession-background-downloads/
它还展示了如何并行实现多个任务的进度监控运行：
仅试用此代码Swift 3.0
首先创建 NS 对象文件
在创建的文件中复制此代码
import UIKit
class Downloader : NSObject, URLSessionDownloadDelegate {
var url : URL?
// will be used to do whatever is needed once download is complete
var obj1 : NSObject?
init(_ obj1 : NSObject)
{
self.obj1 = obj1
}
//is called once the download is complete
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL)
{
//copy downloaded data to your documents directory with same names as source file
let documentsUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first
let destinationUrl = documentsUrl!.appendingPathComponent(url!.lastPathComponent)
let dataFromURL = NSData(contentsOf: location)
dataFromURL?.write(to: destinationUrl, atomically: true)
//now it is time to do what is needed to be done after the download
//obj1!.callWhatIsNeeded()
}
//this is to track progress
private func URLSession(session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64)
{
}
// if there is an error during download this will be called
func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?)
{
if(error != nil)
{
//handle the error
print("Download completed with error: \(error!.localizedDescription)");
}
}
//method to be called to download
func download(url: URL)
{
self.url = url
//download identifier can be customized. I used the "ulr.absoluteString"
let sessionConfig = URLSessionConfiguration.background(withIdentifier: url.absoluteString)
let session = Foundation.URLSession(configuration: sessionConfig, delegate: self, delegateQueue: nil)
let task = session.downloadTask(with: url)
task.resume()
}}
然后复制下面的代码并将代码放在您要下载文件的位置
object = "http://www.mywebsite.com/myfile.pdf"
let url1 = URL(string: object!)
Downloader(url1! as NSObject).download(url: url1!)
Swift 3
你想一点一点地下载文件
并显示进度视图
所以你想试试这个代码
import UIKit
class ViewController: UIViewController,URLSessionDownloadDelegate,UIDocumentInteractionControllerDelegate {
@IBOutlet weak var img: UIImageView!
@IBOutlet weak var btndown: UIButton!
var urlLink: URL!
var defaultSession: URLSession!
var downloadTask: URLSessionDownloadTask!
//var backgroundSession: URLSession!
@IBOutlet weak var progress: UIProgressView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let backgroundSessionConfiguration = URLSessionConfiguration.background(withIdentifier: "backgroundSession")
defaultSession = Foundation.URLSession(configuration: backgroundSessionConfiguration, delegate: self, delegateQueue: OperationQueue.main)
progress.setProgress(0.0, animated: false)
}
func startDownloading () {
let url = URL(string: "http://publications.gbdirect.co.uk/c_book/thecbook.pdf")!
downloadTask = defaultSession.downloadTask(with: url)
downloadTask.resume()
}
@IBAction func btndown(_ sender: UIButton) {
startDownloading()
}
func showFileWithPath(path: String){
let isFileFound:Bool? = FileManager.default.fileExists(atPath: path)
if isFileFound == true{
let viewer = UIDocumentInteractionController(url: URL(fileURLWithPath: path))
viewer.delegate = self
viewer.presentPreview(animated: true)
}
}
// MARK:- URLSessionDownloadDelegate
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
print(downloadTask)
print("File download succesfully")
let path = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)
let documentDirectoryPath:String = path[0]
let fileManager = FileManager()
let destinationURLForFile = URL(fileURLWithPath: documentDirectoryPath.appendingFormat("/file.pdf"))
if fileManager.fileExists(atPath: destinationURLForFile.path){
showFileWithPath(path: destinationURLForFile.path)
print(destinationURLForFile.path)
}
else{
do {
try fileManager.moveItem(at: location, to: destinationURLForFile)
// show file
showFileWithPath(path: destinationURLForFile.path)
}catch{
print("An error occurred while moving file to destination url")
}
}
}
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
progress.setProgress(Float(totalBytesWritten)/Float(totalBytesExpectedToWrite), animated: true)
}
func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
downloadTask = nil
progress.setProgress(0.0, animated: true)
if (error != nil) {
print("didCompleteWithError \(error?.localizedDescription ?? "no value")")
}
else {
print("The task finished successfully")
}
}
func documentInteractionControllerViewControllerForPreview(_ controller: UIDocumentInteractionController) -> UIViewController
{
return self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
使用此代码您希望在应用程序的文档目录中自动下载文件存储
此代码 100% 有效
这里是 Swift 4 版本：
static func loadFileAsync(url: URL, completion: @escaping (String?, Error?) -> Void)
{
let documentsUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let destinationUrl = documentsUrl.appendingPathComponent(url.lastPathComponent)
if FileManager().fileExists(atPath: destinationUrl.path)
{
completion(destinationUrl.path, nil)
}
else
{
let session = URLSession(configuration: URLSessionConfiguration.default, delegate: nil, delegateQueue: nil)
var request = URLRequest(url: url)
request.httpMethod = "GET"
let task = session.dataTask(with: request, completionHandler:
{
data, response, error in
if error == nil
{
if let response = response as? HTTPURLResponse
{
if response.statusCode == 200
{
if let data = data
{
if let _ = try? data.write(to: destinationUrl, options: Data.WritingOptions.atomic)
{
completion(destinationUrl.path, error)
}
else
{
completion(destinationUrl.path, error)
}
}
else
{
completion(destinationUrl.path, error)
}
}
}
}
else
{
completion(destinationUrl.path, error)
}
})
task.resume()
}
}
是的，您可以使用此代码非常轻松地从远程下载文件 Url。
此代码对我来说工作正常。
func DownlondFromUrl(){
// Create destination URL
let documentsUrl:URL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first as URL!
let destinationFileUrl = documentsUrl.appendingPathComponent("downloadedFile.jpg")
//Create URL to the source file you want to download
let fileURL = URL(string: "https://s3.amazonaws.com/learn-swift/IMG_0001.JPG")
let sessionConfig = URLSessionConfiguration.default
let session = URLSession(configuration: sessionConfig)
let request = URLRequest(url:fileURL!)
let task = session.downloadTask(with: request) { (tempLocalUrl, response, error) in
if let tempLocalUrl = tempLocalUrl, error == nil {
// Success
if let statusCode = (response as? HTTPURLResponse)?.statusCode {
print("Successfully downloaded. Status code: \(statusCode)")
}
do {
try FileManager.default.copyItem(at: tempLocalUrl, to: destinationFileUrl)
} catch (let writeError) {
print("Error creating a file \(destinationFileUrl) : \(writeError)")
}
} else {
print("Error took place while downloading a file. Error description: %@", error?.localizedDescription);
}
}
task.resume()
}
您还可以使用第三方库，让生活更轻松，例如 Just
Just.get("http://www.mywebsite.com/myfile.pdf")
这里有更多很棒的 Swift 内容 https://github.com/matteocrippa/awesome-swift
Swift 4 and Swift 5 版本如果有人还需要这个
import Foundation
class FileDownloader {
static func loadFileSync(url: URL, completion: @escaping (String?, Error?) -> Void)
{
let documentsUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let destinationUrl = documentsUrl.appendingPathComponent(url.lastPathComponent)
if FileManager().fileExists(atPath: destinationUrl.path)
{
print("File already exists [\(destinationUrl.path)]")
completion(destinationUrl.path, nil)
}
else if let dataFromURL = NSData(contentsOf: url)
{
if dataFromURL.write(to: destinationUrl, atomically: true)
{
print("file saved [\(destinationUrl.path)]")
completion(destinationUrl.path, nil)
}
else
{
print("error saving file")
let error = NSError(domain:"Error saving file", code:1001, userInfo:nil)
completion(destinationUrl.path, error)
}
}
else
{
let error = NSError(domain:"Error downloading file", code:1002, userInfo:nil)
completion(destinationUrl.path, error)
}
}
static func loadFileAsync(url: URL, completion: @escaping (String?, Error?) -> Void)
{
let documentsUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let destinationUrl = documentsUrl.appendingPathComponent(url.lastPathComponent)
if FileManager().fileExists(atPath: destinationUrl.path)
{
print("File already exists [\(destinationUrl.path)]")
completion(destinationUrl.path, nil)
}
else
{
let session = URLSession(configuration: URLSessionConfiguration.default, delegate: nil, delegateQueue: nil)
var request = URLRequest(url: url)
request.httpMethod = "GET"
let task = session.dataTask(with: request, completionHandler:
{
data, response, error in
if error == nil
{
if let response = response as? HTTPURLResponse
{
if response.statusCode == 200
{
if let data = data
{
if let _ = try? data.write(to: destinationUrl, options: Data.WritingOptions.atomic)
{
completion(destinationUrl.path, error)
}
else
{
completion(destinationUrl.path, error)
}
}
else
{
completion(destinationUrl.path, error)
}
}
}
}
else
{
completion(destinationUrl.path, error)
}
})
task.resume()
}
}
}
调用此方法的方法如下：-
let url = URL(string: "http://www.filedownloader.com/mydemofile.pdf")
FileDownloader.loadFileAsync(url: url!) { (path, error) in
print("PDF File downloaded to : \(path!)")
}
一个简单、健壮和优雅的下载管理器，支持同步下载，并使用闭包语法进行进度和完成跟踪。写在Swift和Here
And Use like it
func downloadGIF(url: String) {
let filename = url
let range: Range<String.Index> = filename.range(of:"media/")!
let lastrange: Range<String.Index> = filename.range(of:"/200w_d")!
let finalPath = String(filename[range.lowerBound..<lastrange.lowerBound])
filename[range.lowerBound..<lastrange.lowerBound]
let replaceFirstWords = finalPath.replace(string: "media/", replacement: "SocialStatus_GIF_")
let destinationUrl = "\(replaceFirstWords).gif"
let request = URLRequest(url: URL(string: imageData.bg_image)!)
viewProgress.isHidden = false
self.btnDownload.isHidden = true
setSharingButtonFalse()
let downloadKey = self.downloadManager.downloadFile(withRequest: request,
withName: destinationUrl,
shouldDownloadInBackground: true,
onProgress: { [weak self] (progress) in
self?.viewProgress.progress = CGFloat(progress)
let val = progress * 100
print("val 1 == \(val)")
DispatchQueue.main.async {
self?.viewProgress.setProgressText("\(Int(val))")
}
}) { [weak self] (error, url) in
if let error = error {
print("Error = \(error as NSError)")
self!.isDownloaded = false
self!.viewProgress.isHidden = true
self!.setSharingButtonTrue()
self?.viewProgress.setProgressText("\(0)")
print("handle error since couldn't save GIF")
} else {
if let url = url {
self!.isDownloaded = true
self!.saveGIFDownloaded()
self!.viewProgress.isHidden = true
self!.setSharingButtonTrue()
self!.createAlbum()
self!.saveGIF(url: url.absoluteURL)
}
}
}
}
iOS 13 Swift 5, 5.1
@IBAction func btnDownload(_ sender: Any) {
// file location to save download file
let destination: DownloadRequest.DownloadFileDestination = { _, _ in
var documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
documentsURL.appendPathComponent(statementPDF)
return (documentsURL, [.removePreviousFile])
}
// Alamofire to download file
Alamofire.download("http://pdf_url", to: destination).responseData { response in
hideLoader()
switch response.result {
case .success:
// write something here
if response.destinationURL != nil {
showAlertMessage(titleStr: APPNAME, messageStr: "File Saved in Documents!")
}
case .failure:
showAlertMessage(titleStr: APPNAME, messageStr: response.result.error.debugDescription)
}
}
}
请将这些权限添加到 info.plist，这样您就可以在 Document Directory
中查看下载文件
<key>UIFileSharingEnabled</key>
<true/>
<key>LSSupportsOpeningDocumentsInPlace</key>
<true/>
在尝试了上面的一些建议但没有成功之后（Swift 版本...）我最终使用了官方文档：https://developer.apple.com/documentation/foundation/url_loading_system/downloading_files_from_websites
let downloadTask = URLSession.shared.downloadTask(with: url) {
urlOrNil, responseOrNil, errorOrNil in
// check for and handle errors:
// * errorOrNil should be nil
// * responseOrNil should be an HTTPURLResponse with statusCode in 200..<299
guard let fileURL = urlOrNil else { return }
do {
let documentsURL = try
FileManager.default.url(for: .documentDirectory,
in: .userDomainMask,
appropriateFor: nil,
create: false)
let savedURL = documentsURL.appendingPathComponent(fileURL.lastPathComponent)
try FileManager.default.moveItem(at: fileURL, to: savedURL)
} catch {
print ("file error: \(error)")
}
}
downloadTask.resume()
正在下载 Swift 5 中的文件，带有进度报告，封装到复制粘贴友好协议访问 class:
protocol FileDownloadingDelegate: class {
func updateDownloadProgressWith(progress: Float)
func downloadFinished(localFilePath: URL)
func downloadFailed(withError error: Error)
}
class FilesDownloader: NSObject, URLSessionDownloadDelegate {
private weak var delegate: FileDownloadingDelegate?
func download(from url: URL, delegate: FileDownloadingDelegate) {
self.delegate = delegate
let sessionConfig = URLSessionConfiguration.background(withIdentifier: url.absoluteString) // use this identifier to resume download after app restart
let session = Foundation.URLSession(configuration: sessionConfig, delegate: self, delegateQueue: nil)
let task = session.downloadTask(with: url)
task.resume()
}
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
DispatchQueue.main.async { self.delegate?.downloadFinished(localFilePath: location) }
}
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
DispatchQueue.main.async { self.delegate?.updateDownloadProgressWith(progress: Float(totalBytesWritten)/Float(totalBytesExpectedToWrite)) }
}
func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
guard let theError = error else { assertionFailure("something weird happened here"); return }
DispatchQueue.main.async { self.delegate?.downloadFailed(withError: theError) }
}
}
使用方法：
class MyViewController: UIViewController {
private lazy var downloader = FilesDownloader()
func downloadFile(from url: URL) {
downloader.download(from: url, delegate: self)
}
}
extension MyViewController: FileDownloadingDelegate {
func updateDownloadProgressWith(progress: Float) {
// self.downloadProgressView.setProgress(progress, animated: true)
}
func downloadFinished(tempFilePath: URL) {
print("downloaded to \(tempFilePath)")
// resave the file into your desired place using
// let dataFromURL = NSData(contentsOf: location)
// dataFromURL?.write(to: yourDesiredFileUrl, atomically: true)
}
func downloadFailed(withError error: Error) {
// handle the error
}
}
后台会话（URLSessionDownloadTask、URLSessionUploadTask）是 background transfer 方法的一部分，它允许您在后台模式下 download/upload/cache 文件，即使应用已终止。在这种情况下，当任务完成时 iOS 唤醒它（在后台）并允许在有限的时间范围内进行一些竞争。它之所以有效，是因为下载任务是在 nsurlsessiond 守护进程 [About]
上执行的
我刚开始学习来自 android 的 iOS 的苹果 swift 编程。我现在基本上可以阅读和操作 swift 代码，还学习了一些在 iOS swift 编程中使用的常见 类，但仍然对语法和所有内容感到困惑。
我正在尝试下载文件。就像，让我们说来自这个 URL
var url = "http://www.mywebsite.com/myfile.pdf"
点击按钮。也许视觉上也有进步
通过在 Whosebug 中搜索，我偶然发现了 Alamofire。我可能会尝试，但我不确定这是否是最适合我的方法。
所以，我想问一下我有哪些选择（iOS7 和 iOS8）来实现我的目标。还有，pros and cons会很棒！
示例下载器 class 没有 Alamofire：
class Downloader {
class func load(URL: NSURL) {
let sessionConfig = NSURLSessionConfiguration.defaultSessionConfiguration()
let session = NSURLSession(configuration: sessionConfig, delegate: nil, delegateQueue: nil)
let request = NSMutableURLRequest(URL: URL)
request.HTTPMethod = "GET"
let task = session.dataTaskWithRequest(request, completionHandler: { (data: NSData!, response: NSURLResponse!, error: NSError!) -> Void in
if (error == nil) {
// Success
let statusCode = (response as NSHTTPURLResponse).statusCode
println("Success: \(statusCode)")
// This is your file-variable:
// data
}
else {
// Failure
println("Failure: %@", error.localizedDescription);
}
})
task.resume()
}
}
这是在您自己的代码中使用它的方法：
class Foo {
func bar() {
if var URL = NSURL(string: "http://www.mywebsite.com/myfile.pdf") {
Downloader.load(URL)
}
}
}
Swift 3 版本
另请注意将大文件下载到磁盘上而不是内存中。参见`downloadTask:
class Downloader {
class func load(url: URL, to localUrl: URL, completion: @escaping () -> ()) {
let sessionConfig = URLSessionConfiguration.default
let session = URLSession(configuration: sessionConfig)
let request = try! URLRequest(url: url, method: .get)
let task = session.downloadTask(with: request) { (tempLocalUrl, response, error) in
if let tempLocalUrl = tempLocalUrl, error == nil {
// Success
if let statusCode = (response as? HTTPURLResponse)?.statusCode {
print("Success: \(statusCode)")
}
do {
try FileManager.default.copyItem(at: tempLocalUrl, to: localUrl)
completion()
} catch (let writeError) {
print("error writing file \(localUrl) : \(writeError)")
}
} else {
print("Failure: %@", error?.localizedDescription);
}
}
task.resume()
}
}
这是一个说明如何进行同步和异步的示例。
import Foundation
class HttpDownloader {
class func loadFileSync(url: NSURL, completion:(path:String, error:NSError!) -> Void) {
let documentsUrl = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first as! NSURL
let destinationUrl = documentsUrl.URLByAppendingPathComponent(url.lastPathComponent!)
if NSFileManager().fileExistsAtPath(destinationUrl.path!) {
println("file already exists [\(destinationUrl.path!)]")
completion(path: destinationUrl.path!, error:nil)
} else if let dataFromURL = NSData(contentsOfURL: url){
if dataFromURL.writeToURL(destinationUrl, atomically: true) {
println("file saved [\(destinationUrl.path!)]")
completion(path: destinationUrl.path!, error:nil)
} else {
println("error saving file")
let error = NSError(domain:"Error saving file", code:1001, userInfo:nil)
completion(path: destinationUrl.path!, error:error)
}
} else {
let error = NSError(domain:"Error downloading file", code:1002, userInfo:nil)
completion(path: destinationUrl.path!, error:error)
}
}
class func loadFileAsync(url: NSURL, completion:(path:String, error:NSError!) -> Void) {
let documentsUrl = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first as! NSURL
let destinationUrl = documentsUrl.URLByAppendingPathComponent(url.lastPathComponent!)
if NSFileManager().fileExistsAtPath(destinationUrl.path!) {
println("file already exists [\(destinationUrl.path!)]")
completion(path: destinationUrl.path!, error:nil)
} else {
let sessionConfig = NSURLSessionConfiguration.defaultSessionConfiguration()
let session = NSURLSession(configuration: sessionConfig, delegate: nil, delegateQueue: nil)
let request = NSMutableURLRequest(URL: url)
request.HTTPMethod = "GET"
let task = session.dataTaskWithRequest(request, completionHandler: { (data: NSData!, response: NSURLResponse!, error: NSError!) -> Void in
if (error == nil) {
if let response = response as? NSHTTPURLResponse {
println("response=\(response)")
if response.statusCode == 200 {
if data.writeToURL(destinationUrl, atomically: true) {
println("file saved [\(destinationUrl.path!)]")
completion(path: destinationUrl.path!, error:error)
} else {
println("error saving file")
let error = NSError(domain:"Error saving file", code:1001, userInfo:nil)
completion(path: destinationUrl.path!, error:error)
}
}
}
}
else {
println("Failure: \(error.localizedDescription)");
completion(path: destinationUrl.path!, error:error)
}
})
task.resume()
}
}
}
以下是如何在您的代码中使用它：
let url = NSURL(string: "http://www.mywebsite.com/myfile.pdf")
HttpDownloader.loadFileAsync(url, completion:{(path:String, error:NSError!) in
println("pdf downloaded to: \(path)")
})
只要您的应用程序在前台运行，Devran 和 djunod 的解决方案就可以正常工作。如果您在下载过程中切换到另一个应用程序，则会失败。我的文件大小约为 10 MB，下载需要一些时间。所以我需要我的下载功能即使在应用程序进入后台时也能正常工作。
请注意，我在 "Capabilities" 开启了 "Background Modes / Background Fetch"。
由于不支持完成处理程序，因此未封装解决方案。抱歉。
--Swift 2.3--
import Foundation
class Downloader : NSObject, NSURLSessionDownloadDelegate
{
var url : NSURL?
// will be used to do whatever is needed once download is complete
var yourOwnObject : NSObject?
init(yourOwnObject : NSObject)
{
self.yourOwnObject = yourOwnObject
}
//is called once the download is complete
func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didFinishDownloadingToURL location: NSURL)
{
//copy downloaded data to your documents directory with same names as source file
let documentsUrl = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first
let destinationUrl = documentsUrl!.URLByAppendingPathComponent(url!.lastPathComponent!)
let dataFromURL = NSData(contentsOfURL: location)
dataFromURL?.writeToURL(destinationUrl, atomically: true)
//now it is time to do what is needed to be done after the download
yourOwnObject!.callWhatIsNeeded()
}
//this is to track progress
func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64)
{
}
// if there is an error during download this will be called
func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?)
{
if(error != nil)
{
//handle the error
print("Download completed with error: \(error!.localizedDescription)");
}
}
//method to be called to download
func download(url: NSURL)
{
self.url = url
//download identifier can be customized. I used the "ulr.absoluteString"
let sessionConfig = NSURLSessionConfiguration.backgroundSessionConfigurationWithIdentifier(url.absoluteString)
let session = NSURLSession(configuration: sessionConfig, delegate: self, delegateQueue: nil)
let task = session.downloadTaskWithURL(url)
task.resume()
}
}
下面是如何调用 --Swift 2.3--
let url = NSURL(string: "http://company.com/file.txt")
Downloader(yourOwnObject).download(url!)
--Swift 3--
class Downloader : NSObject, URLSessionDownloadDelegate {
var url : URL?
// will be used to do whatever is needed once download is complete
var yourOwnObject : NSObject?
init(_ yourOwnObject : NSObject)
{
self.yourOwnObject = yourOwnObject
}
//is called once the download is complete
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL)
{
//copy downloaded data to your documents directory with same names as source file
let documentsUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first
let destinationUrl = documentsUrl!.appendingPathComponent(url!.lastPathComponent)
let dataFromURL = NSData(contentsOf: location)
dataFromURL?.write(to: destinationUrl, atomically: true)
//now it is time to do what is needed to be done after the download
yourOwnObject!.callWhatIsNeeded()
}
//this is to track progress
private func URLSession(session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64)
{
}
// if there is an error during download this will be called
func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?)
{
if(error != nil)
{
//handle the error
print("Download completed with error: \(error!.localizedDescription)");
}
}
//method to be called to download
func download(url: URL)
{
self.url = url
//download identifier can be customized. I used the "ulr.absoluteString"
let sessionConfig = URLSessionConfiguration.background(withIdentifier: url.absoluteString)
let session = Foundation.URLSession(configuration: sessionConfig, delegate: self, delegateQueue: nil)
let task = session.downloadTask(with: url)
task.resume()
}}
下面是如何调用 --Swift 3--
let url = URL(string: "http://company.com/file.txt")
Downloader(yourOwnObject).download(url!)
如果您只需要将文本文件下载到 String 中，您可以使用这种简单的方法，Swift 5:
let list = try? String(contentsOf: URL(string: "https://example.com/file.txt")!)
如果您需要非可选结果或错误处理：
do {
let list = try String(contentsOf: URL(string: "https://example.com/file.txt")!)
}
catch {
// Handle error here
}
你应该知道网络操作可能需要一些时间，为了防止它在主线程中 运行 并锁定你的 UI，你可能希望异步执行代码，例如：
DispatchQueue.global().async {
let list = try? String(contentsOf: URL(string: "https://example.com/file.txt")!)
}
Swift 3
class ViewController: UIViewController {
var urlLink: URL!
var defaultSession: URLSession!
var downloadTask: URLSessionDownloadTask!
}
// MARK: Button Pressed
@IBAction func btnDownloadPressed(_ sender: UIButton) {
let urlLink1 = URL.init(string: "https://github.com/VivekVithlani/QRCodeReader/archive/master.zip")
startDownloading(url: urlLink!)
}
@IBAction func btnResumePressed(_ sender: UIButton) {
downloadTask.resume()
}
@IBAction func btnStopPressed(_ sender: UIButton) {
downloadTask.cancel()
}
@IBAction func btnPausePressed(_ sender: UIButton) {
downloadTask.suspend()
}
func startDownloading (url:URL) {
let backgroundSessionConfiguration = URLSessionConfiguration.background(withIdentifier: "backgroundSession")
defaultSession = Foundation.URLSession(configuration: backgroundSessionConfiguration, delegate: self, delegateQueue: OperationQueue.main)
downloadProgress.setProgress(0.0, animated: false)
downloadTask = defaultSession.downloadTask(with: urlLink)
downloadTask.resume()
}
// MARK:- URLSessionDownloadDelegate
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
print("File download succesfully")
}
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
downloadProgress.setProgress(Float(totalBytesWritten)/Float(totalBytesExpectedToWrite), animated: true)
}
func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
downloadTask = nil
downloadProgress.setProgress(0.0, animated: true)
if (error != nil) {
print("didCompleteWithError \(error?.localizedDescription)")
}
else {
print("The task finished successfully")
}
}
使用URLSessionDownloadTask在后台下载文件，这样即使应用终止也能完成。
有关详细信息，请参阅：
https://www.ralfebert.de/snippets/ios/urlsession-background-downloads/
它还展示了如何并行实现多个任务的进度监控运行：
仅试用此代码Swift 3.0 首先创建 NS 对象文件 在创建的文件中复制此代码
import UIKit
class Downloader : NSObject, URLSessionDownloadDelegate {
var url : URL?
// will be used to do whatever is needed once download is complete
var obj1 : NSObject?
init(_ obj1 : NSObject)
{
self.obj1 = obj1
}
//is called once the download is complete
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL)
{
//copy downloaded data to your documents directory with same names as source file
let documentsUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first
let destinationUrl = documentsUrl!.appendingPathComponent(url!.lastPathComponent)
let dataFromURL = NSData(contentsOf: location)
dataFromURL?.write(to: destinationUrl, atomically: true)
//now it is time to do what is needed to be done after the download
//obj1!.callWhatIsNeeded()
}
//this is to track progress
private func URLSession(session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64)
{
}
// if there is an error during download this will be called
func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?)
{
if(error != nil)
{
//handle the error
print("Download completed with error: \(error!.localizedDescription)");
}
}
//method to be called to download
func download(url: URL)
{
self.url = url
//download identifier can be customized. I used the "ulr.absoluteString"
let sessionConfig = URLSessionConfiguration.background(withIdentifier: url.absoluteString)
let session = Foundation.URLSession(configuration: sessionConfig, delegate: self, delegateQueue: nil)
let task = session.downloadTask(with: url)
task.resume()
}}
然后复制下面的代码并将代码放在您要下载文件的位置
object = "http://www.mywebsite.com/myfile.pdf"
let url1 = URL(string: object!)
Downloader(url1! as NSObject).download(url: url1!)
Swift 3
你想一点一点地下载文件 并显示进度视图 所以你想试试这个代码
import UIKit
class ViewController: UIViewController,URLSessionDownloadDelegate,UIDocumentInteractionControllerDelegate {
@IBOutlet weak var img: UIImageView!
@IBOutlet weak var btndown: UIButton!
var urlLink: URL!
var defaultSession: URLSession!
var downloadTask: URLSessionDownloadTask!
//var backgroundSession: URLSession!
@IBOutlet weak var progress: UIProgressView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let backgroundSessionConfiguration = URLSessionConfiguration.background(withIdentifier: "backgroundSession")
defaultSession = Foundation.URLSession(configuration: backgroundSessionConfiguration, delegate: self, delegateQueue: OperationQueue.main)
progress.setProgress(0.0, animated: false)
}
func startDownloading () {
let url = URL(string: "http://publications.gbdirect.co.uk/c_book/thecbook.pdf")!
downloadTask = defaultSession.downloadTask(with: url)
downloadTask.resume()
}
@IBAction func btndown(_ sender: UIButton) {
startDownloading()
}
func showFileWithPath(path: String){
let isFileFound:Bool? = FileManager.default.fileExists(atPath: path)
if isFileFound == true{
let viewer = UIDocumentInteractionController(url: URL(fileURLWithPath: path))
viewer.delegate = self
viewer.presentPreview(animated: true)
}
}
// MARK:- URLSessionDownloadDelegate
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
print(downloadTask)
print("File download succesfully")
let path = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true)
let documentDirectoryPath:String = path[0]
let fileManager = FileManager()
let destinationURLForFile = URL(fileURLWithPath: documentDirectoryPath.appendingFormat("/file.pdf"))
if fileManager.fileExists(atPath: destinationURLForFile.path){
showFileWithPath(path: destinationURLForFile.path)
print(destinationURLForFile.path)
}
else{
do {
try fileManager.moveItem(at: location, to: destinationURLForFile)
// show file
showFileWithPath(path: destinationURLForFile.path)
}catch{
print("An error occurred while moving file to destination url")
}
}
}
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
progress.setProgress(Float(totalBytesWritten)/Float(totalBytesExpectedToWrite), animated: true)
}
func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
downloadTask = nil
progress.setProgress(0.0, animated: true)
if (error != nil) {
print("didCompleteWithError \(error?.localizedDescription ?? "no value")")
}
else {
print("The task finished successfully")
}
}
func documentInteractionControllerViewControllerForPreview(_ controller: UIDocumentInteractionController) -> UIViewController
{
return self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
使用此代码您希望在应用程序的文档目录中自动下载文件存储
此代码 100% 有效
这里是 Swift 4 版本：
static func loadFileAsync(url: URL, completion: @escaping (String?, Error?) -> Void)
{
let documentsUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let destinationUrl = documentsUrl.appendingPathComponent(url.lastPathComponent)
if FileManager().fileExists(atPath: destinationUrl.path)
{
completion(destinationUrl.path, nil)
}
else
{
let session = URLSession(configuration: URLSessionConfiguration.default, delegate: nil, delegateQueue: nil)
var request = URLRequest(url: url)
request.httpMethod = "GET"
let task = session.dataTask(with: request, completionHandler:
{
data, response, error in
if error == nil
{
if let response = response as? HTTPURLResponse
{
if response.statusCode == 200
{
if let data = data
{
if let _ = try? data.write(to: destinationUrl, options: Data.WritingOptions.atomic)
{
completion(destinationUrl.path, error)
}
else
{
completion(destinationUrl.path, error)
}
}
else
{
completion(destinationUrl.path, error)
}
}
}
}
else
{
completion(destinationUrl.path, error)
}
})
task.resume()
}
}
是的，您可以使用此代码非常轻松地从远程下载文件 Url。 此代码对我来说工作正常。
func DownlondFromUrl(){
// Create destination URL
let documentsUrl:URL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first as URL!
let destinationFileUrl = documentsUrl.appendingPathComponent("downloadedFile.jpg")
//Create URL to the source file you want to download
let fileURL = URL(string: "https://s3.amazonaws.com/learn-swift/IMG_0001.JPG")
let sessionConfig = URLSessionConfiguration.default
let session = URLSession(configuration: sessionConfig)
let request = URLRequest(url:fileURL!)
let task = session.downloadTask(with: request) { (tempLocalUrl, response, error) in
if let tempLocalUrl = tempLocalUrl, error == nil {
// Success
if let statusCode = (response as? HTTPURLResponse)?.statusCode {
print("Successfully downloaded. Status code: \(statusCode)")
}
do {
try FileManager.default.copyItem(at: tempLocalUrl, to: destinationFileUrl)
} catch (let writeError) {
print("Error creating a file \(destinationFileUrl) : \(writeError)")
}
} else {
print("Error took place while downloading a file. Error description: %@", error?.localizedDescription);
}
}
task.resume()
}
您还可以使用第三方库，让生活更轻松，例如 Just
Just.get("http://www.mywebsite.com/myfile.pdf")
这里有更多很棒的 Swift 内容 https://github.com/matteocrippa/awesome-swift
Swift 4 and Swift 5 版本如果有人还需要这个
import Foundation
class FileDownloader {
static func loadFileSync(url: URL, completion: @escaping (String?, Error?) -> Void)
{
let documentsUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let destinationUrl = documentsUrl.appendingPathComponent(url.lastPathComponent)
if FileManager().fileExists(atPath: destinationUrl.path)
{
print("File already exists [\(destinationUrl.path)]")
completion(destinationUrl.path, nil)
}
else if let dataFromURL = NSData(contentsOf: url)
{
if dataFromURL.write(to: destinationUrl, atomically: true)
{
print("file saved [\(destinationUrl.path)]")
completion(destinationUrl.path, nil)
}
else
{
print("error saving file")
let error = NSError(domain:"Error saving file", code:1001, userInfo:nil)
completion(destinationUrl.path, error)
}
}
else
{
let error = NSError(domain:"Error downloading file", code:1002, userInfo:nil)
completion(destinationUrl.path, error)
}
}
static func loadFileAsync(url: URL, completion: @escaping (String?, Error?) -> Void)
{
let documentsUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
let destinationUrl = documentsUrl.appendingPathComponent(url.lastPathComponent)
if FileManager().fileExists(atPath: destinationUrl.path)
{
print("File already exists [\(destinationUrl.path)]")
completion(destinationUrl.path, nil)
}
else
{
let session = URLSession(configuration: URLSessionConfiguration.default, delegate: nil, delegateQueue: nil)
var request = URLRequest(url: url)
request.httpMethod = "GET"
let task = session.dataTask(with: request, completionHandler:
{
data, response, error in
if error == nil
{
if let response = response as? HTTPURLResponse
{
if response.statusCode == 200
{
if let data = data
{
if let _ = try? data.write(to: destinationUrl, options: Data.WritingOptions.atomic)
{
completion(destinationUrl.path, error)
}
else
{
completion(destinationUrl.path, error)
}
}
else
{
completion(destinationUrl.path, error)
}
}
}
}
else
{
completion(destinationUrl.path, error)
}
})
task.resume()
}
}
}
调用此方法的方法如下：-
let url = URL(string: "http://www.filedownloader.com/mydemofile.pdf")
FileDownloader.loadFileAsync(url: url!) { (path, error) in
print("PDF File downloaded to : \(path!)")
}
一个简单、健壮和优雅的下载管理器，支持同步下载，并使用闭包语法进行进度和完成跟踪。写在Swift和Here
And Use like it
func downloadGIF(url: String) {
let filename = url
let range: Range<String.Index> = filename.range(of:"media/")!
let lastrange: Range<String.Index> = filename.range(of:"/200w_d")!
let finalPath = String(filename[range.lowerBound..<lastrange.lowerBound])
filename[range.lowerBound..<lastrange.lowerBound]
let replaceFirstWords = finalPath.replace(string: "media/", replacement: "SocialStatus_GIF_")
let destinationUrl = "\(replaceFirstWords).gif"
let request = URLRequest(url: URL(string: imageData.bg_image)!)
viewProgress.isHidden = false
self.btnDownload.isHidden = true
setSharingButtonFalse()
let downloadKey = self.downloadManager.downloadFile(withRequest: request,
withName: destinationUrl,
shouldDownloadInBackground: true,
onProgress: { [weak self] (progress) in
self?.viewProgress.progress = CGFloat(progress)
let val = progress * 100
print("val 1 == \(val)")
DispatchQueue.main.async {
self?.viewProgress.setProgressText("\(Int(val))")
}
}) { [weak self] (error, url) in
if let error = error {
print("Error = \(error as NSError)")
self!.isDownloaded = false
self!.viewProgress.isHidden = true
self!.setSharingButtonTrue()
self?.viewProgress.setProgressText("\(0)")
print("handle error since couldn't save GIF")
} else {
if let url = url {
self!.isDownloaded = true
self!.saveGIFDownloaded()
self!.viewProgress.isHidden = true
self!.setSharingButtonTrue()
self!.createAlbum()
self!.saveGIF(url: url.absoluteURL)
}
}
}
}
iOS 13 Swift 5, 5.1
@IBAction func btnDownload(_ sender: Any) {
// file location to save download file
let destination: DownloadRequest.DownloadFileDestination = { _, _ in
var documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
documentsURL.appendPathComponent(statementPDF)
return (documentsURL, [.removePreviousFile])
}
// Alamofire to download file
Alamofire.download("http://pdf_url", to: destination).responseData { response in
hideLoader()
switch response.result {
case .success:
// write something here
if response.destinationURL != nil {
showAlertMessage(titleStr: APPNAME, messageStr: "File Saved in Documents!")
}
case .failure:
showAlertMessage(titleStr: APPNAME, messageStr: response.result.error.debugDescription)
}
}
}
请将这些权限添加到 info.plist，这样您就可以在 Document Directory
<key>UIFileSharingEnabled</key>
<true/>
<key>LSSupportsOpeningDocumentsInPlace</key>
<true/>
在尝试了上面的一些建议但没有成功之后（Swift 版本...）我最终使用了官方文档：https://developer.apple.com/documentation/foundation/url_loading_system/downloading_files_from_websites
let downloadTask = URLSession.shared.downloadTask(with: url) {
urlOrNil, responseOrNil, errorOrNil in
// check for and handle errors:
// * errorOrNil should be nil
// * responseOrNil should be an HTTPURLResponse with statusCode in 200..<299
guard let fileURL = urlOrNil else { return }
do {
let documentsURL = try
FileManager.default.url(for: .documentDirectory,
in: .userDomainMask,
appropriateFor: nil,
create: false)
let savedURL = documentsURL.appendingPathComponent(fileURL.lastPathComponent)
try FileManager.default.moveItem(at: fileURL, to: savedURL)
} catch {
print ("file error: \(error)")
}
}
downloadTask.resume()
正在下载 Swift 5 中的文件，带有进度报告，封装到复制粘贴友好协议访问 class:
protocol FileDownloadingDelegate: class {
func updateDownloadProgressWith(progress: Float)
func downloadFinished(localFilePath: URL)
func downloadFailed(withError error: Error)
}
class FilesDownloader: NSObject, URLSessionDownloadDelegate {
private weak var delegate: FileDownloadingDelegate?
func download(from url: URL, delegate: FileDownloadingDelegate) {
self.delegate = delegate
let sessionConfig = URLSessionConfiguration.background(withIdentifier: url.absoluteString) // use this identifier to resume download after app restart
let session = Foundation.URLSession(configuration: sessionConfig, delegate: self, delegateQueue: nil)
let task = session.downloadTask(with: url)
task.resume()
}
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
DispatchQueue.main.async { self.delegate?.downloadFinished(localFilePath: location) }
}
func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
DispatchQueue.main.async { self.delegate?.updateDownloadProgressWith(progress: Float(totalBytesWritten)/Float(totalBytesExpectedToWrite)) }
}
func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
guard let theError = error else { assertionFailure("something weird happened here"); return }
DispatchQueue.main.async { self.delegate?.downloadFailed(withError: theError) }
}
}
使用方法：
class MyViewController: UIViewController {
private lazy var downloader = FilesDownloader()
func downloadFile(from url: URL) {
downloader.download(from: url, delegate: self)
}
}
extension MyViewController: FileDownloadingDelegate {
func updateDownloadProgressWith(progress: Float) {
// self.downloadProgressView.setProgress(progress, animated: true)
}
func downloadFinished(tempFilePath: URL) {
print("downloaded to \(tempFilePath)")
// resave the file into your desired place using
// let dataFromURL = NSData(contentsOf: location)
// dataFromURL?.write(to: yourDesiredFileUrl, atomically: true)
}
func downloadFailed(withError error: Error) {
// handle the error
}
}
后台会话（URLSessionDownloadTask、URLSessionUploadTask）是 background transfer 方法的一部分，它允许您在后台模式下 download/upload/cache 文件，即使应用已终止。在这种情况下，当任务完成时 iOS 唤醒它（在后台）并允许在有限的时间范围内进行一些竞争。它之所以有效，是因为下载任务是在 nsurlsessiond 守护进程 [About]