my custom alertview controller

alertViewController.m

// add text field in alert view controller

UIAlertController * alertController = [UIAlertController alertControllerWithTitle: @"Login"
                                                                                  message: @"Input username and password"
                                                                              preferredStyle:UIAlertControllerStyleAlert];
    [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = @"name";
        textField.textColor = [UIColor blueColor];
        textField.clearButtonMode = UITextFieldViewModeWhileEditing;
        textField.borderStyle = UITextBorderStyleRoundedRect;
    }];
    [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = @"password";
        textField.textColor = [UIColor blueColor];
        textField.clearButtonMode = UITextFieldViewModeWhileEditing;
        textField.borderStyle = UITextBorderStyleRoundedRect;
        textField.secureTextEntry = YES;
    }];
    [alertController addAction:[UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
        NSArray * textfields = alertController.textFields;
        UITextField * namefield = textfields[0];
        UITextField * passwordfiled = textfields[1];
        NSLog(@"%@:%@",namefield.text,passwordfiled.text);

    }]];
    [self presentViewController:alertController animated:YES completion:nil];

// add text field in alert view controller

 UIAlertController * alert=   [UIAlertController
                                              alertControllerWithTitle:@"H&L"
                                              message:@"No match was found for this image! Do you want to try again?"
                                              preferredStyle:UIAlertControllerStyleAlert];
                
                UIAlertAction* ok = [UIAlertAction
                                     actionWithTitle:@"Retry"
                                     style:UIAlertActionStyleDefault
                                     handler:^(UIAlertAction * action)
                                     {
                                         //[MyTabBarController]
                                         
                                         [[self navigationController]popViewControllerAnimated:YES];
                                         [alert dismissViewControllerAnimated:YES completion:nil];
                                         
                                     }];
                UIAlertAction* cancel = [UIAlertAction
                                         actionWithTitle:@"Cancel"
                                         style:UIAlertActionStyleDefault
                                         handler:^(UIAlertAction * action)
                                         {
                                             
                                             [[self navigationController]popViewControllerAnimated:YES];
                                             self.navigationController.tabBarController.selectedIndex = 0;
                                             NSLog(@"Resolving UIAlertActionController for tapping cancel button");
                                             [alert dismissViewControllerAnimated:YES completion:nil];
                                             
                                         }];
                [alert addAction:ok];
                [alert addAction:cancel];
                
                [self presentViewController:alert animated:YES completion:nil];