Iphone XCODE-如何：UIAlertView（带有文本字段）在循环中显示，直到在字段中输入正确的值为止？

我目前正在使用Xcode开发iOS应用程序

我已经设置了一个UIAlertView（以问题作为消息），以弹出一个文本字段来检索响应

所需的功能是，在文本字段中输入不正确的值时，UIAlert将循环。。。直到输入正确的响应。此时，UIAlert将被解除

这是我到目前为止所拥有的

- (void)application:(UIApplication *)application 
didReceiveLocalNotification:(UILocalNotification *)notification {

    NSString* correctAnswer = @"2";


    UIAlertView *alert = [[UIAlertView alloc] 
                          initWithTitle:@"Alarm" 
                          message:@"1 + 1 ="  
                          delegate:self 
                          cancelButtonTitle: nil 
                          otherButtonTitles:@"Continue", nil ];

    alert.alertViewStyle = UIAlertViewStylePlainTextInput;
    UITextField* answerField = [alert textFieldAtIndex:0];
    answerField.keyboardType = UIKeyboardTypeNumberPad;
    answerField.placeholder = @"answer";

    [alert show];


    // I feel like this would work, but I know it doesn't...

    NSString *answerFieldString = answerField.text;
    if ([answerFieldString isEqualToString: correctAnswer ])
    {
        [alert dismissWithClickedButtonIndex:-1 animated:YES];
    }


}

我已经做了大量的谷歌搜索，但无法找到解决方案。。。任何回复都将不胜感激

试试这个

- (BOOL)alertViewShouldEnableFirstOtherButton:(UIAlertView *)alertView
{
     NSString *answerFieldString = answerField.text;
    if ([answerFieldString isEqualToString: correctAnswer ])
    {
        [alertView dismissWithClickedButtonIndex:-1 animated:YES];
    }

}

你为什么不编辑你的，而不是创建一个新的？