나타났다 사라지는 토스트 메시지

//토스트 메시지

NSString *message = @"message...";

                

UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil

                            message: message

                           preferredStyle:UIAlertControllerStyleAlert];

                

[self presentViewController:alert animated:YES completion:nil];

                

int duration = 1; // duration in seconds

                

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, duration * NSEC_PER_SEC), dispatch_get_main_queue(), ^{

      [alert dismissViewControllerAnimated:YES completion:nil];

});