尝试在swift 2.0中执行GET请求时出错

Question

所以我尝试在Swift 2.0中执行GET请求，在从我的Swift 1.2迁移了几行代码后，我收到了这个错误，我真的不知道如何绕过它/正确迁移它。

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()
}

在此之后，Xcode向我输出以下错误：

无法使用类型为(NSMutableURLRequest，completionHandler: (NSData！，NSURLResponse！，NSError！) -

你有没有遇到过这种情况，或者知道如何解决它？

Answer 1

此代码应该有效。使用 Swift，你需要让它尽可能多地决定变量的类型。请注意，我取出了你的石膏。

    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()
}