UITableIViewCell 图片从 URL 下载
UITableIViewCell image downloading from URL
我正在使用 alamofire 从 URL 下载图像。
我正在点击图片,但在显示视图时没有。
如何在出现视图时获取所有图像?这是我用来实现的代码:
import UIKit
import Alamofire
import SwiftyJSON
import SDWebImage
import Kingfisher
class Paragogoi: UITableViewController {
var data=[FronItem]()
override func viewDidLoad() {
super.viewDidLoad()
Alamofire.request(.GET, "http://gaiaskarpos.com/getCategores.php").validate().responseJSON { response in
switch response.result {
case .Success:
if let value = response.result.value
{
let json = JSON(value)
let list: Array<JSON> = json.arrayValue
var urls=[String]()
for element in list{
let id:String=element["id"].stringValue
let name:String=element["name"].stringValue
let url:String=element["url"].stringValue
self.data.append(FronItem(id:id,name:name,url:url))
};
self.tableView.reloadData()
}
case .Failure(let error):
print(error)
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return data.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("paragogosCell", forIndexPath: indexPath)
cell.textLabel?.text = data[indexPath.row].name
asycloadp(data[indexPath.row].url!, imageView: cell.imageView!)
return cell
}
func asycloadp(url:String,imageView:UIImageView){
let downloadQueue=dispatch_queue_create("myqueue", nil)
print(url)
dispatch_async(downloadQueue){
let imageUrl:NSURL?
= NSURL(string:url)
dispatch_async(dispatch_get_main_queue()){
imageView.sd_setImageWithURL(imageUrl)
}
}
}
}
我应该添加除此之外的任何内容吗?
从服务器获取所有数据后,只需在主线程中重新加载 tableView
。
dispatch_async(dispatch_get_main_queue()) {
self.tableView.reloadData()
}
因为dispatch_async是异步传输,下载图片后要刷新table查看,但是我看你用的是SDWebImage,那你就不用asycloadp函数了,改一下你的代码然后重试。
import UIKit
import Alamofire
import SwiftyJSON
import SDWebImage
import Kingfisher
class Paragogoi: UITableViewController {
var data=[FronItem]()
override func viewDidLoad() {
super.viewDidLoad()
Alamofire.request(.GET, "http://gaiaskarpos.com/getCategores.php").validate().responseJSON { response in
switch response.result {
case .Success:
if let value = response.result.value {
let json = JSON(value)
let list: Array<JSON> = json.arrayValue
var urls=[String]()
for element in list{
let id:String=element["id"].stringValue
let name:String=element["name"].stringValue
let url:String=element["url"].stringValue
self.data.append(FronItem(id:id,name:name,url:url))
};
self.tableView.reloadData()
}
case .Failure(let error):
print(error)
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return data.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("paragogosCell", forIndexPath: indexPath)
cell.textLabel?.text = data[indexPath.row].name
let imageUrl:NSURL? = NSURL(string:url)
cell.imageView!.sd_setImageWithURL(imageUrl, completed:{(image: UIImage?, error: NSError?, cacheType: SDImageCacheType!, imageURL: NSURL?) in
if (image != nil) {
tableView.reloadRowsAtIndexPaths([indexPath], withRowAnimation: .None)
}
})
return cell
}
}
我正在使用 alamofire 从 URL 下载图像。
我正在点击图片,但在显示视图时没有。
如何在出现视图时获取所有图像?这是我用来实现的代码:
import UIKit
import Alamofire
import SwiftyJSON
import SDWebImage
import Kingfisher
class Paragogoi: UITableViewController {
var data=[FronItem]()
override func viewDidLoad() {
super.viewDidLoad()
Alamofire.request(.GET, "http://gaiaskarpos.com/getCategores.php").validate().responseJSON { response in
switch response.result {
case .Success:
if let value = response.result.value
{
let json = JSON(value)
let list: Array<JSON> = json.arrayValue
var urls=[String]()
for element in list{
let id:String=element["id"].stringValue
let name:String=element["name"].stringValue
let url:String=element["url"].stringValue
self.data.append(FronItem(id:id,name:name,url:url))
};
self.tableView.reloadData()
}
case .Failure(let error):
print(error)
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return data.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("paragogosCell", forIndexPath: indexPath)
cell.textLabel?.text = data[indexPath.row].name
asycloadp(data[indexPath.row].url!, imageView: cell.imageView!)
return cell
}
func asycloadp(url:String,imageView:UIImageView){
let downloadQueue=dispatch_queue_create("myqueue", nil)
print(url)
dispatch_async(downloadQueue){
let imageUrl:NSURL?
= NSURL(string:url)
dispatch_async(dispatch_get_main_queue()){
imageView.sd_setImageWithURL(imageUrl)
}
}
}
}
我应该添加除此之外的任何内容吗?
从服务器获取所有数据后,只需在主线程中重新加载 tableView
。
dispatch_async(dispatch_get_main_queue()) {
self.tableView.reloadData()
}
因为dispatch_async是异步传输,下载图片后要刷新table查看,但是我看你用的是SDWebImage,那你就不用asycloadp函数了,改一下你的代码然后重试。
import UIKit
import Alamofire
import SwiftyJSON
import SDWebImage
import Kingfisher
class Paragogoi: UITableViewController {
var data=[FronItem]()
override func viewDidLoad() {
super.viewDidLoad()
Alamofire.request(.GET, "http://gaiaskarpos.com/getCategores.php").validate().responseJSON { response in
switch response.result {
case .Success:
if let value = response.result.value {
let json = JSON(value)
let list: Array<JSON> = json.arrayValue
var urls=[String]()
for element in list{
let id:String=element["id"].stringValue
let name:String=element["name"].stringValue
let url:String=element["url"].stringValue
self.data.append(FronItem(id:id,name:name,url:url))
};
self.tableView.reloadData()
}
case .Failure(let error):
print(error)
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return data.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("paragogosCell", forIndexPath: indexPath)
cell.textLabel?.text = data[indexPath.row].name
let imageUrl:NSURL? = NSURL(string:url)
cell.imageView!.sd_setImageWithURL(imageUrl, completed:{(image: UIImage?, error: NSError?, cacheType: SDImageCacheType!, imageURL: NSURL?) in
if (image != nil) {
tableView.reloadRowsAtIndexPaths([indexPath], withRowAnimation: .None)
}
})
return cell
}
}