iphone - 如何让 UIAlertView 再次调用自己？

Question

下面是场景。

1. 我在显示警报的控制器的 viewDidLoad 中创建了 UIAlertView。

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

2. 我称它为 [alert show] 并显示出来。

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

   - (void)textFieldDidEndEditing:(UITextField *)textField
   {
   if ([textField.text length] > 0)
   {
   
   }
   else
   {
    NSLog(@"Checking");
    [loginAlert show];
   }
   }
   

但它不再显示。请告诉我该怎么办？

Answer 1

代替delegate:nil, 放delegate:self

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

Answer 2

首先将您的警报视图委托更改为自我。

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

[loginAlert show];

然后在警报视图委托方法中检查文本的长度，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

尝试这个：

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];
        }
    }
}

另请参阅您的问题：

1. 保持 UIAlertView 显示
2. uialertview 多次调用

Answer 4

设置委托self而不是nil实现我的代码。

    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

   -(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。

Answer 6

怎么样让它简单..？

- (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];
}
}