OBJC:UIAlertController : 'UIAlertView' is deprecated, use UIAlertController with a preferredStyle

OBJC:UIAlertController : 'UIAlertView' is deprecated, use UIAlertController with a preferredStyle

// UIAlertController example. 'UIAlertView' is deprecated: first deprecated in iOS 9.0 - UIAlertView is deprecated. 
// Use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert instead
// More at: http://useyourloaf.com/blog/uialertcontroller-changes-in-ios-8/
- (void) handleError{
    UIAlertController *alertController = [UIAlertController
                                          alertControllerWithTitle:nil
                                          message:@"Incorrect Credentials"
                                          preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *okAction = [UIAlertAction
                               actionWithTitle:NSLocalizedString(@"OK", @"OK action")
                               style:UIAlertActionStyleDefault
                               handler:^(UIAlertAction *action)
                               {
                                   NSLog(@"OK action");
                               }];
    [alertController addAction:okAction];
    [self presentViewController:alertController animated:YES completion:nil];
    
}