尝试在Swift 2.0中执行GET请求时出错 [英] Error trying to perform a GET request in swift 2.0

问题描述

所以我试图在Swift 2.0中执行GET请求，并且从Swift 1.2迁移了几行代码后，我遇到了这个错误，我并没有真正理解如何绕过它/正确地迁移它

So I'm trying to perform a GET request in Swift 2.0, and after migrating a few lines of code from my Swift 1.2 I'm getting this error that I'm not really understanding how to bypass it / migrate it correctly.

该函数编写如下:

func performGetRequest(targetURL: NSURL!, completion: (data: NSData?, HTTPStatusCode: Int, error: NSError?) -> Void) {
    let request = NSMutableURLRequest(URL: targetURL)
    request.HTTPMethod = "GET"

    let sessionConfiguration = NSURLSessionConfiguration.defaultSessionConfiguration()

    let session = NSURLSession(configuration: sessionConfiguration)

    let task = session.dataTaskWithRequest(request, completionHandler: { (data: NSData!, response: NSURLResponse!, error: NSError!) -> Void in
        dispatch_async(dispatch_get_main_queue(), { () -> Void in
            completion(data: data, HTTPStatusCode: (response as! NSHTTPURLResponse).statusCode, error: error)
        })
    })


    task.resume()
}

此后，Xcode向我输出以下错误:

After this, Xcode outputs me the following error:

无法使用类型为((NSMutableURLRequest，completeHandler:(NSData !, NSURLResponse !, NSError！)-> Void)''的参数列表调用'dataTaskWithRequest'

Cannot invoke 'dataTaskWithRequest' with an argument list of type '(NSMutableURLRequest, completionHandler: (NSData!, NSURLResponse!, NSError!) -> Void)'

您是否曾经遇到过这个问题，或者知道如何解决?

Have you ever came across this, or know how to fix-it?

推荐答案

此代码应该有效.使用Swift，您需要让它决定变量的类型.请注意，我拿走了你的演员表.

This code should work. With Swift, you need to let it decide what type a variable is as much as you can. Notice that I took out your casts.

    func performGetRequest(targetURL: NSURL!, completion: (data: NSData?, HTTPStatusCode: Int, error: NSError?) -> Void) {
    let request = NSMutableURLRequest(URL: targetURL)
    request.HTTPMethod = "GET"

    let sessionConfiguration = NSURLSessionConfiguration.defaultSessionConfiguration()

    let session = NSURLSession(configuration: sessionConfiguration)

    let task = session.dataTaskWithRequest(request, completionHandler: { (data, response, error) -> Void in
        dispatch_async(dispatch_get_main_queue(), { () -> Void in
            completion(data: data, HTTPStatusCode: (response as! NSHTTPURLResponse).statusCode, error: error)
        })
    })


    task.resume()
}

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