如何将同步 post 请求转换为异步 post 请求?
How can I convert a synchronous post request to an asynchronous post request?
众所周知,异步 post 请求更好,因为用户不会感觉到应用在加载长进程时有 "crashed"。
但是,我不确定从哪里开始将同步 post 请求转换为异步 post 请求 Swift 代码。
我目前有这个代码:
func checkLogin () {
let username:NSString = txtUsername.text! as NSString
let password:NSString = txtPassword.text! as NSString
do {
let post:NSString = "username=\(username)&password=\(password)" as NSString
NSLog("PostData: %@",post);
let url:URL = URL(string:"https://example.com/login.php")!
let postData:Data = post.data(using: String.Encoding.ascii.rawValue)!
let postLength:NSString = String( postData.count ) as NSString
let request:NSMutableURLRequest = NSMutableURLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = postData
request.setValue(postLength as String, forHTTPHeaderField: "Content-Length")
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.setValue("application/json", forHTTPHeaderField: "Accept")
var reponseError: NSError?
var response: URLResponse?
var urlData: Data?
do {
urlData = try NSURLConnection.sendSynchronousRequest(request as URLRequest, returning:&response)
} catch let error as NSError {
reponseError = error
urlData = nil
}
if ( urlData != nil ) {
let res = response as! HTTPURLResponse!;
NSLog("Response code: %ld", res?.statusCode);
if ((res?.statusCode)! >= 200 && (res?.statusCode)! < 300) {
let responseData:NSString = NSString(data:urlData!, encoding:String.Encoding.utf8.rawValue)!
NSLog("Response ==> %@", responseData);
let jsonData:NSDictionary = try JSONSerialization.jsonObject(with: urlData!, options:JSONSerialization.ReadingOptions.mutableContainers ) as! NSDictionary
let success:NSInteger = jsonData.value(forKey: "success") as! NSInteger
NSLog("Success: %ld", success);
if(success == 1)
{
// do something, code removed
} else {
var error_msg:NSString
if jsonData["error_message"] as? NSString != nil {
error_msg = jsonData["error_message"] as! NSString
} else {
error_msg = "Unknown Error"
}
// show alert
}
}
}
}
}
首先不要使用 NSURLConnection
,因为它现在 已弃用 。而是使用 NSURLSession
.
你可以像这样简单地使用:
let task = URLSession.shared().dataTask(with: request) {
data, response, error in
if (data) {
} else {
print("error=\(error!.localizedDescription)")
}
}
task.resume()
你真的需要做很多改变。使用 swift 类型,而不是 NSMutableURLRequest
使用 URLRequest
使用 String
而不是 NSString
而不是 NSDictionary
& NSArray
使用 Swift 字典和数组
func checkLogin () {
let username = txtUsername.text!
let password = txtPassword.text!
let post = "username=\(username)&password=\(password)"
NSLog("PostData: %@",post);
let url:URL = URL(string:"https://example.com/login.php")!
let postData = post.data(using: .utf8)!
let postLength = String( postData.count )
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = postData
request.setValue(postLength as String, forHTTPHeaderField: "Content-Length")
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.setValue("application/json", forHTTPHeaderField: "Accept")
let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
if error != nil {
return
}
if let jsonData = (try? JSONSerialization.jsonObject(with: data!, options: [])) as? [String:Any] {
let success = jsonData["success"] as! Int
if success == 1 {
//do something,
}
else {
//show alert
}
}
})
task.resume()
}
众所周知,异步 post 请求更好,因为用户不会感觉到应用在加载长进程时有 "crashed"。
但是,我不确定从哪里开始将同步 post 请求转换为异步 post 请求 Swift 代码。
我目前有这个代码:
func checkLogin () {
let username:NSString = txtUsername.text! as NSString
let password:NSString = txtPassword.text! as NSString
do {
let post:NSString = "username=\(username)&password=\(password)" as NSString
NSLog("PostData: %@",post);
let url:URL = URL(string:"https://example.com/login.php")!
let postData:Data = post.data(using: String.Encoding.ascii.rawValue)!
let postLength:NSString = String( postData.count ) as NSString
let request:NSMutableURLRequest = NSMutableURLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = postData
request.setValue(postLength as String, forHTTPHeaderField: "Content-Length")
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.setValue("application/json", forHTTPHeaderField: "Accept")
var reponseError: NSError?
var response: URLResponse?
var urlData: Data?
do {
urlData = try NSURLConnection.sendSynchronousRequest(request as URLRequest, returning:&response)
} catch let error as NSError {
reponseError = error
urlData = nil
}
if ( urlData != nil ) {
let res = response as! HTTPURLResponse!;
NSLog("Response code: %ld", res?.statusCode);
if ((res?.statusCode)! >= 200 && (res?.statusCode)! < 300) {
let responseData:NSString = NSString(data:urlData!, encoding:String.Encoding.utf8.rawValue)!
NSLog("Response ==> %@", responseData);
let jsonData:NSDictionary = try JSONSerialization.jsonObject(with: urlData!, options:JSONSerialization.ReadingOptions.mutableContainers ) as! NSDictionary
let success:NSInteger = jsonData.value(forKey: "success") as! NSInteger
NSLog("Success: %ld", success);
if(success == 1)
{
// do something, code removed
} else {
var error_msg:NSString
if jsonData["error_message"] as? NSString != nil {
error_msg = jsonData["error_message"] as! NSString
} else {
error_msg = "Unknown Error"
}
// show alert
}
}
}
}
}
首先不要使用 NSURLConnection
,因为它现在 已弃用 。而是使用 NSURLSession
.
你可以像这样简单地使用:
let task = URLSession.shared().dataTask(with: request) {
data, response, error in
if (data) {
} else {
print("error=\(error!.localizedDescription)")
}
}
task.resume()
你真的需要做很多改变。使用 swift 类型,而不是 NSMutableURLRequest
使用 URLRequest
使用 String
而不是 NSString
而不是 NSDictionary
& NSArray
使用 Swift 字典和数组
func checkLogin () {
let username = txtUsername.text!
let password = txtPassword.text!
let post = "username=\(username)&password=\(password)"
NSLog("PostData: %@",post);
let url:URL = URL(string:"https://example.com/login.php")!
let postData = post.data(using: .utf8)!
let postLength = String( postData.count )
var request = URLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = postData
request.setValue(postLength as String, forHTTPHeaderField: "Content-Length")
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.setValue("application/json", forHTTPHeaderField: "Accept")
let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
if error != nil {
return
}
if let jsonData = (try? JSONSerialization.jsonObject(with: data!, options: [])) as? [String:Any] {
let success = jsonData["success"] as! Int
if success == 1 {
//do something,
}
else {
//show alert
}
}
})
task.resume()
}