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我有一个登录屏幕，当用户多次输入错误密码时会显示警报。单击其中一个按钮时，将显示另一个警报视图以确认，如果我在第二个警报视图上按下取消按钮，数字键盘将从屏幕底部弹回其原始位置。在第二次警报响应期间没有执行任何代码。有人可以帮忙吗？

if (loginCount < 5) {
  // Display alert to user
  UIAlertView *loginError = [[UIAlertView alloc] initWithTitle:@"Login Failure" message:@"You have entered an incorrect passcode.  Please try again." delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:nil];
  [loginError show];

  } else {
    // Display alert to user, including option to reset the app as they have 5 or more login failures
    UIAlertView *loginError = [[UIAlertView alloc] initWithTitle: @"Login Failure" message: @"You have entered an incorrect passcode on 5 or more occasions.  Please try again or reset the app." delegate: self cancelButtonTitle: @"Try Again" otherButtonTitles: @"Reset App", nil]
    [loginError show];
}
// Clear password fields
[self clearPasswordFields];
[passcode1 becomeFirstResponder];
// Increment the login count
loginCount++;

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {

    // If the user has chosen to reset the app, alert with a confirmation first before resetting
    NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
    if ([title isEqualToString:@"Reset App"]) {
        // Create alert to give the user the choice to confirm reset
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Confirm Reset" message:@"Are you sure you wish to Reset?" delegate:self cancelButtonTitle:@"No" otherButtonTitles:@"Yes", nil];
        [alert show];
    } else if ([title isEqualToString:@"Yes"] && buttonIndex == 1) {
        [Utilities resetApp];
        [self dismissViewControllerAnimated:NO completion:nil];
    }
}
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1 回答 1

1

我将这样做。

在头文件中：

UIAlertView *loginError;

在实现文件中：

-(void)textFieldDidEndEditing:(UITextField *)textField
{
  if (loginCount < 5) {
  // Display alert to user
  loginError = [[UIAlertView alloc] initWithTitle:@"Login Failure" message:@"You have entered an incorrect passcode.  Please try again." delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:nil];
  [loginError show];

  } else {
    // Display alert to user, including option to reset the app as they have 5 or more login failures
    loginError = [[UIAlertView alloc] initWithTitle: @"Login Failure" message: @"You have entered an incorrect passcode on 5 or more occasions.  Please try again or reset the app." delegate: self cancelButtonTitle: @"Try Again" otherButtonTitles: @"Reset App", nil]
    [loginError show];
}
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {

    // If the user has chosen to reset the app, alert with a confirmation first before resetting
    NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
    if ([title isEqualToString:@"Reset App"]) {
        [self showSecondAlert];
    } else if ([title isEqualToString:@"Yes"] && buttonIndex == 1) {
        [Utilities resetApp];
        [self dismissViewControllerAnimated:NO completion:nil];
    }else{
      [self clearPasswordFields];
      [passcode1 becomeFirstResponder];
    }
}

-(void)showSecondAlert
{
        //make sure you dismiss the old alertview first
         [loginError dismissWithClickedButtonIndex:0  animated:NO];
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Confirm Reset" message:@"Are you sure you wish to Reset?" delegate:self cancelButtonTitle:@"No" otherButtonTitles:@"Yes", nil];
        [alert show];
}

希望这可以帮助...

于 2013-03-07T18:06:20.400 回答