为啥程序在登录时不执行segue？

Posted 2023-03-16

【中文标题】为啥程序在登录时不执行segue？

【英文标题】：Why is the program not performing segue when logged in?为什么程序在登录时不执行segue？

【发布时间】：2015-10-26 17:09:22

【问题描述】：

我有一个登录屏幕，如果单击登录按钮时凭据正确，则将执行 segue。 segue 具有正确的标识符，并且用户已登录，因为我正在通过 currentUser 传递数据，并且它显示在控制台中，表明用户已登录，但未执行 segue。为什么？下面是我的登录代码。

 @IBAction func loginAction(sender: AnyObject) 

    let username = self.usernameField.text
    let password = self.passwordField.text


    if(username!.utf16.count) < 4 || (password!.utf16.count < 5)

    let alert = UIAlertView(title: "Invalid", message: "Username must be greater then 4 and Password must be greater then 5", delegate: self, cancelButtonTitle: "OK")
    alert.show()

    else

        self.actInd.startAnimating()

        PFUser.logInWithUsernameInBackground(username!, password: password!, block:  (user, error) -> Void in

            self.actInd.stopAnimating()

            if ((user) != nil) 

                var alert = UIAlertView(title: "Success", message: "Logged In", delegate: self, cancelButtonTitle: "OK")
                alert.show()

                self.performSegueWithIdentifier("login", sender: self)

            else 

                let alert = UIAlertView(title: "Error", message: "\(error)", delegate: self, cancelButtonTitle: "OK")
                alert.show()

            



        )

    

【参考方案1】：

您正在后台线程上调用 performSegueWithIdentifier。 尝试用

包装它

dispatch_async(dispatch_get_main_queue(),



 ) 

【讨论】：

我收到一个错误2015-10-26 12:21:24.909 Musec[63427:654722] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'This query has an outstanding network connection. You have to wait until it's done.

我发现了问题所在，它与其他问题有关。