ios - 无法通过 UIAlert 中的闭包关闭 View Controller

Question

---

全部，

我正在尝试编写一个将闭包传递给 UIAlertAction 的方法，这样当点击警报上的确定按钮时，警报和调用 View Controller 都会被关闭。

我有的是:

func displayErrMsg( ecode : errorCodes ) ->() {

    var etitle = ""
    var etext  = ""
    var completionHandler: (()->())?
    switch ecode {
        case .NoError :
            etitle = "Found You!"
            etext  = "Check your email for a link to reset your password"
            completionHandler = { self.dismissViewControllerAnimated(true, { println("BUHBYE") })}
        case .EmailAddressNotFound :
             etitle = "Sorry, but we could not find you."
             etext  = "Have you registered?"
        case .MalFormedEmailAddress :
            etitle = "Opps!"
            etext   = "that is not a valid email address"
        default : println(" unrecognized error code: \(ecode)")
    }

    userMessage( self, etitle, etext, completionHandler )

}

它调用这个:

public func userMessage(parent: UIViewController, title:String, message:String, completion:(() ->())?) {
    var okButton : UIAlertAction
    var alert    = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
    if let comp  = completion {
        okButton = UIAlertAction(title: "Ok", style: .Default, handler: { (alert) -> Void in
            comp()
        })
    }
    else
    {
        okButton = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, nil)
    }
    alert.addAction(okButton)
    parent.presentViewController(alert, animated: true, completion: nil)
}

在 ecode 为 .NoError 的情况下，我看到控制台中打印了“BUHBYE”，但是在点击确定按钮后 View 不会被删除(警报被删除)。据我所知，应该被关闭关闭的 View Controller 是 displayErrorMsg叫做。正确的？为什么这行不通？

非常感谢任何帮助。:bp:

Answer 1

我还不熟悉 swift，但如果逻辑与 Objective-C 相同，您可能希望在 didDismiss 警报 View 调用中显示此 View Controller ，而不是 点击按钮 :

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex

另请注意，在实际关闭警报 View 之前，您不能从层次结构中删除呈现警报 View 的 View Controller 。