ios message box

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@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]]; }