UIAlertView and UIAlertController

UIAlertView and UIAlertController

if ( NSClassFromString(@"UIAlertController") != nil ) {
            //make and use a UIAlertController
            UIAlertController *alertController = [UIAlertController
                                                  alertControllerWithTitle:@"Вы не авторизованы"
                                                  message:@"Пожалуйста введите логин и пароль"
                                                  preferredStyle:UIAlertControllerStyleAlert];
            UIAlertAction *okAction = [UIAlertAction
                                       actionWithTitle:@"OK"
                                       style:UIAlertActionStyleDefault
                                       handler:^(UIAlertAction *action)
                                       {
                                       }];
             
            /*                         
            UIAlertAction *cancelAction = [UIAlertAction 
            actionWithTitle:NSLocalizedString(@"Cancel", @"Cancel action")
                      style:UIAlertActionStyleCancel
                    handler:^(UIAlertAction *action)
                    {
                      NSLog(@"Cancel action");
                    }];
            */
            [alertController addAction:cancelAction];
            [alertController addAction:okAction];
            [self presentViewController:alertController animated:YES completion:nil];
        }
        else {
            //make and use a UIAlertView
            UIAlertView *alertView = [[UIAlertView alloc]
                                      initWithTitle:@"Вы не авторизованы"
                                      message:@"Пожалуйста введите логин и пароль"
                                      delegate:self
                                      cancelButtonTitle:@"OK"
                                      otherButtonTitles:nil, nil];
            
            [alertView show];
        }
        
// More this - http://useyourloaf.com/blog/2014/09/05/uialertcontroller-changes-in-ios-8.html