Swift 向请求添加参数

Question

我正在尝试向 NSURLSession request 添加电子邮件和密码，如下所示:

 @IBAction func btnLogin(sender: AnyObject) {
        let email = txtEmail.text
        let password = txtPassword.text
        let data = ["email": email!, "password": password!] as Dictionary<String, String>
        let session = NSURLSession.sharedSession()
        let url = NSURL(string: "http://temp.com/api/v1/login")!
        let request = NSMutableURLRequest(URL: url)
        do {
        request.HTTPBody = try NSJSONSerialization.dataWithJSONObject(data, options: [])
        }
        catch {
            print("error!")
        }
        request.HTTPMethod = "POST"
        let task = session.dataTaskWithRequest(request) {
            (data, response, error) in
            guard let response = response as? NSHTTPURLResponse else {print(error); return}
            if response.statusCode == 200 {
                print("ingelogd!")
            }
            self.errorLogin()
        }
        task.resume()
    }

错误:

2016-07-03 17:54:04.890 EmployeeDirectory2[4693:133721] *** Assertion failure in -[UIKeyboardTaskQueue waitUntilAllTasksAreFinished], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3512.60.7/Keyboard/UIKeyboardTaskQueue.m:386
2016-07-03 17:54:04.894 EmployeeDirectory2[4693:133721] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[UIKeyboardTaskQueue waitUntilAllTasksAreFinished] may only be called from the main thread.'

但是当我尝试这个时它崩溃了。如何适本地添加参数？

Answer 1

崩溃可能来自对 self.errorLogin() 调用的调用，它试图在主线程之外执行一些 UI 任务。您应该能够像这样修复它:

let task = session.dataTaskWithRequest(request) {
    (data, response, error) in
    guard let response = response as? NSHTTPURLResponse else {print(error); return}
    if response.statusCode == 200 {
        print("ingelogd!")
    }
    // Add this:
    dispatch_async(dispatch_get_main_queue()) {
        self.errorLogin()
    }
 }