Question

以下是该方案。

我在Controller的viewDidLoad中创建了一个UIAlertView，其中显示了Alert。

loginAlert = [[UIAlertView alloc] initWithTitle:@"Check"
                                            message:@"Ok"
                                           delegate:nil
                                  cancelButtonTitle:@"Ok"
                                  otherButtonTitles:nil, nil];
[loginAlert setAlertViewStyle:UIAlertViewStyleSecureTextInput];

我将其称为[提示显示]并显示。

当用户按下Ok时，它会转到textEndEditing委托方法，如果输入了nil / worng值，我再次调用[alert show]。

- (void)textFieldDidEndEditing:(UITextField *)textField
{
if ([textField.text length] > 0)
{

}
else
{
 NSLog(@"Checking");
 [loginAlert show];
}
}

但它没有再显示出来。请告诉我该怎么办？

Answer 1

而不是delegate:nil，请delegate:self

loginAlert = [[UIAlertView alloc] initWithTitle:@"Check"
                                            message:@"Ok"
                                           delegate:self
                                  cancelButtonTitle:@"Ok"
                                  otherButtonTitles:nil, nil];
[loginAlert setAlertViewStyle:UIAlertViewStyleSecureTextInput];

Answer 2

首先将您的提醒视图委托更改为自己。

loginAlert = [[UIAlertView alloc] initWithTitle:@"Check"
                                        message:@"Ok"
                                       delegate:self
                              cancelButtonTitle:@"Ok"
                              otherButtonTitles:nil, nil];
[loginAlert setAlertViewStyle:UIAlertViewStyleSecureTextInput];

[loginAlert show];

然后在警报视图中委托方法检查文本的长度，如果为空，则再次显示警报。

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{
    if (buttonIndex == 0) {
        if ([[loginAlert textFieldAtIndex:0].text length] > 0)
        {

        }
        else
        {
            NSLog(@"Checking");
            [loginAlert show];
        }
    }
}

Answer 3

试试这个：

loginAlert = [[UIAlertView alloc] initWithTitle:@"Check"
                                        message:@"Ok"
                                       delegate:self
                              cancelButtonTitle:@"Ok"
                              otherButtonTitles:nil, nil];
[loginAlert setAlertViewStyle:UIAlertViewStyleSecureTextInput]; 


- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{
    if (buttonIndex == 0) {
        [yourTextField resignFirstResponder];
    }
}

- (void)textFieldDidEndEditing:(UITextField *)textField {
    if (textField==yourTextField) {
        if ([yourTextField.text isEqualToString:@""] || yourTextField.text == nil) {
            [yourAlert show];
        }
    }
}

另请参阅此问题：

Answer 4

设置委托self而不是nil并实施我的代码。

    loginAlert = [[UIAlertView alloc] initWithTitle:@"Check"
                                                message:@"Ok"
                                               delegate:self
                                      cancelButtonTitle:@"Ok"
                                      otherButtonTitles:nil, nil];
    [loginAlert setAlertViewStyle:UIAlertViewStyleSecureTextInput]; 



 - (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
     {
        if(buttonIndex == 0)
        {
            [self.view endEditing:YES];
        }
    }

Answer 5

如何简化......？

- (void)textFieldDidEndEditing:(UITextField *)textField
{
if ([textField.text length] > 0)
{

}
else
{
 NSLog(@"Checking");
 loginAlert = [[UIAlertView alloc] initWithTitle:@"Check"
                                            message:@"Ok"
                                           delegate:self
                                  cancelButtonTitle:@"Ok"
                                  otherButtonTitles:nil, nil];
[loginAlert setAlertViewStyle:UIAlertViewStyleSecureTextInput]; 
 [loginAlert show];
}
}

Answer 6

   -(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{
  if (buttonIndex == 0) 
    {
       // Your code write in this method and show your alert 
    }
   else
   {
        [loginalert show];
   }
}

我希望这段代码对你有用。

如何让UIAlertView再次调用？

6 个答案: