Objective C

@interface K3ViewController : UIViewController<UIAlertViewDelegate>

@end


#import "K3ViewController.h"

@interface K3ViewController ()
@property (weak, nonatomic) IBOutlet UILabel *resultLabel;

@end

@implementation K3ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    UIAlertView *versionMessageBox = [[UIAlertView alloc] initWithTitle:@"This is a test title"
                                                                message:@"This is a test message for displaying nothing in details."
                                                               delegate:self
                                                      cancelButtonTitle:@"Yes"
                                                      otherButtonTitles:@"No", nil];
    [versionMessageBox show];
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    
    self.resultLabel.text =[NSString stringWithFormat:@"You have chosen %@",
                            [alertView buttonTitleAtIndex:buttonIndex]];
}