UIAlertView在另一个UIAlertView屏蔽整个应用程序中的键盘输入

问题是iOS键盘有时不再反应。所以没有输入是可能的。如果我取消注释clickedButtonAtIndex中的第二个UIAlertView，它工作正常。UIAlertView在另一个UIAlertView屏蔽整个应用程序中的键盘输入

原因可能是其他地方？我不知道......

谢谢

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

if(buttonIndex == 1) 
{ 
    [MBProgressHUD showHUDAddedTo:self.view animated:YES]; 

    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, 0.05 * NSEC_PER_SEC); 

    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){ 

     // User exists already 
     RequestObject * requestObject = [RequestObject sharedRequestObject]; 
     [requestObject loginWithEmail:self.emailTextField.text andPassword:self.passwordTextField.text 
           success:^(UserVO *user) { 

            // ... 

           } failure:^(ErrorVO *error) { 

            // User does not exist, create a new one 
            if (error.code == ERROR_USER_UNKNOWN) { 

             // ... 

            } else { 
             UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"ALERT_CAPTION_ERROR", "<Error>") message:[ErrorCode getErrorMessage:error] delegate:nil cancelButtonTitle:NSLocalizedString(@"ALERT_BUTTON_TEXT_OK", "<Ok>") otherButtonTitles:nil]; 
             [alert show]; 
            } 
           }]; 

     [MBProgressHUD hideHUDForView:self.view animated:YES]; 
    }); 
}

}