sendAsynchronousRequest 在 iOS 9 中被弃用，如何修改代码来修复

sendAsynchronousRequest was deprecated in iOS 9, How to alter code to fix

提问by Dom Bryan

Below is my code I am getting the issue with:

以下是我遇到问题的代码：

func parseFeedForRequest(request: NSURLRequest, callback: (feed: RSSFeed?, error: NSError?) -> Void)
{
    NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) { (response, data, error) -> Void in

        if ((error) != nil)
        {
            callback(feed: nil, error: error)
        }
        else
        {
            self.callbackClosure = callback

            let parser : NSXMLParser = NSXMLParser(data: data!)
            parser.delegate = self
            parser.shouldResolveExternalEntities = false
            parser.parse()
        }
    }
}

This is now deprecated as of iOS 9, and is telling me to use dataTaskWithRequest instead. Can someone help me change sendAsync with dataTask, I don't know how to.

现在从 iOS 9 开始不推荐使用它，并告诉我改用 dataTaskWithRequest。有人可以帮我用 dataTask 更改 sendAsync，我不知道该怎么做。

回答by Nilesh Patel

Use NSURLSessioninstead like below,

使用NSURLSession如下所示，

For Objective-C

对于 Objective-C

NSURLSession *session = [NSURLSession sharedSession];
[[session dataTaskWithURL:[NSURL URLWithString:"YOUR URL"]
          completionHandler:^(NSData *data,
                              NSURLResponse *response,
                              NSError *error) {
            // handle response

  }] resume];

For Swift,

对于斯威夫特，

    var request = NSMutableURLRequest(URL: NSURL(string: "YOUR URL")!)
    var session = NSURLSession.sharedSession()
    request.HTTPMethod = "POST"

    var params = ["username":"username", "password":"password"] as Dictionary<String, String>

    request.HTTPBody = try? NSJSONSerialization.dataWithJSONObject(params, options: [])

    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    request.addValue("application/json", forHTTPHeaderField: "Accept")

    var task = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in
        print("Response: \(response)")})

    task.resume()

For asynchronously query, from Apple docs

对于异步查询，来自 Apple文档

Like most networking APIs, the NSURLSession API is highly asynchronous. It returns data in one of two ways, depending on the methods you call:

To a completion handler block that returns data to your app when a transfer finishes successfully or with an error.

By calling methods on your custom delegate as the data is received.

By calling methods on your custom delegate when download to a file is complete.

像大多数网络 API 一样，NSURLSession API 是高度异步的。它以两种方式之一返回数据，具体取决于您调用的方法：

到一个完成处理程序块，当传输成功完成或出现错误时将数据返回到您的应用程序。

通过在接收数据时调用自定义委托的方法。

通过在下载到文件完成后调用自定义委托上的方法。

回答by Ankit Sachan

Swift implementation

Swift 实现

let session = NSURLSession.sharedSession()
session.dataTaskWithRequest(request) { (data, response, error) -> Void in

}

回答by karma

Swift 3.0

斯威夫特 3.0

var request = URLRequest(url: URL(string: "http://example.com")!)
request.httpMethod = "POST"
let session = URLSession.shared

session.dataTask(with: request) {data, response, err in
    print("Entered the completionHandler")
}.resume()

回答by karma

This is the swift 2.1 version:

这是 swift 2.1 版本：

let request = NSMutableURLRequest(URL: NSURL(string: "YOUR URL")!)
let session = NSURLSession.sharedSession()
request.HTTPMethod = "POST"

let params = ["username":"username", "password":"password"] as Dictionary<String, String>

request.HTTPBody = try! NSJSONSerialization.dataWithJSONObject(params, options: [])
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")

let task = session.dataTaskWithRequest(request, completionHandler: {data, response, error -> Void in
print("Response: \(response)")})

task.resume()

回答by Elliott Davies

Swift 2.0:

斯威夫特 2.0：

Old (replace with New below):

旧的（用下面的新替换）：

NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue()) { (response, data, error) -> Void in

// Code

}

New:

新的：

let task = NSURLSession.sharedSession().dataTaskWithRequest(request){ data, response, error in

// Code

}
task.resume()

回答by Imtee

with swift 3.1

快速 3.1

let request = NSMutableURLRequest(url: NSURL(string: image_url_string)! as URL)
    let session = URLSession.shared
    request.httpMethod = "POST"

    let params = ["username":"username", "password":"password"] as Dictionary<String, String>

    request.httpBody = try? JSONSerialization.data(withJSONObject: params, options: [])

    request.addValue("application/json", forHTTPHeaderField: "Content-Type")
    request.addValue("application/json", forHTTPHeaderField: "Accept")

    let task = session.dataTask(with: request as URLRequest, completionHandler: {data, response, error -> Void in
        print("Response: \(String(describing: response))")})

    task.resume()

回答by Haroldo Gondim

Swift 4

斯威夫特 4

let params = ["email":"[email protected]", "password":"123456"] as Dictionary<String, String>

var request = URLRequest(url: URL(string: "http://localhost:8080/api/1/login")!)
request.httpMethod = "POST"
request.httpBody = try? JSONSerialization.data(withJSONObject: params, options: [])
request.addValue("application/json", forHTTPHeaderField: "Content-Type")

let session = URLSession.shared
let task = session.dataTask(with: request, completionHandler: { data, response, error -> Void in

    do {
        let json = try JSONSerialization.jsonObject(with: data!) as! Dictionary<String, AnyObject>
        print(json)
    } catch {
        print("error")
    }

})

task.resume()

回答by Michele Dall'Agata

Swift 4.2

斯威夫特 4.2

This worked for me:

这对我有用：

func loadImageFromURL(URL: NSURL) {
    let request = URLRequest(url: URL as URL)
    let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
        if let imageData = data {
            DispatchQueue.main.async {
                self.imageView.image = UIImage(data: imageData)
            }
        }
    }
    task.resume()
}

I had to add "DispatchQueue.main.async { }" because I had a runtime warning, since only the main thread is supposed to modify UI elements.

我不得不添加“DispatchQueue.main.async { }”，因为我有一个运行时警告，因为只有主线程应该修改 UI 元素。

回答by Vatsal Shukla

Here is the SWIFT3.0 Version of Nilesh Patel's Answerwith JSONSerialised data

这是带有 JSONSerialised 数据的Nilesh Patel 答案的 SWIFT3.0 版本

let url = URL(string: "<HERE GOES SERVER API>")!
            var request = URLRequest(url: url)
            request.httpMethod = "POST" //GET OR DELETE etc....
            request.setValue("application/json", forHTTPHeaderField: "Content-Type")
            request.setValue("<ValueforAuthorization>", forHTTPHeaderField: "Authorization")
            let parameter = [String:Any]() //This is your parameters [String:Any]
            do {
                let jsonData = try JSONSerialization.data(withJSONObject: parameter, options: .prettyPrinted)
                // here "jsonData" is the dictionary encoded in JSON data
                request.httpBody = jsonData
                let session = URLSession(configuration: .default)
                let task = session.dataTask(with: request, completionHandler: { (incomingData, response, error) in
                    if let error = error {
                        print(error.localizedDescription)
                        print(request)
                    }else if let response = response {
                        print(response)
                    }else if let incomingData = incomingData {
                        print(incomingData)
                    }
                })
                task.resume()

            } catch {
                print(error.localizedDescription)
            }

回答by Naishta

Illustrating with an example, the alternative code to the deprecation of:

举例说明，弃用的替代代码：

sendAsynchronousRequest(_:queue:completionHandler:)' was deprecated in iOS 9.0: Use [NSURLSession dataTaskWithRequest:completionHandler:]

sendAsynchronousRequest(_:queue:completionHandler:)' 在 iOS 9.0 中被弃用：使用 [NSURLSession dataTaskWithRequest:completionHandler:]

Tested and works in Swift 2.1 onwards.

已在 Swift 2.1 及更高版本中进行测试和工作。

import UIKit

class ViewController: UIViewController {


    @IBOutlet var theImage: UIImageView!


    override func viewDidLoad() {
        super.viewDidLoad()


        let url = NSURL(string: "https://upload.wikimedia.org/wikipedia/commons/6/6a/Johann_Sebastian_Bach.jpg")


        let task = NSURLSession.sharedSession().dataTaskWithURL(url!) { (data, response, error) -> Void in

            if error != nil {
                print("thers an error in the log")
            } else {

                dispatch_async(dispatch_get_main_queue()) {
                let image = UIImage(data: data!)
                self.theImage.image = image

                }
            }

        }

        task.resume()

    }

}

//Displays an image on the ViewControllers ImageView. Connect an outlet of the ImageView

//在ViewControllers ImageView 上显示一个图像。连接 ImageView 的一个插座