gistfile1.m

@interface MyClass() <UIAlertViewDelegate>
@end

@implementation MyClass

- (void) hoge
{
    UIAlertView *alert = [[UIAlertView alloc] init];
    alert.delegate = self;
    alert.title = @"タイトル";
    alert.message = @"メッセージ";
    [alert addButtonWithTitle:@"OK"];
    [alert addButtonWithTitle:@"CANCEL"];
    alert.cancelButtonIndex = 1;
    [alert show];
}

-(void)alertView:(UIAlertView*)alertView 
clickedButtonAtIndex:(NSInteger)buttonIndex
{
    switch (buttonIndex) {
        case 0:
            NSLog(@"OK");
            break;
        case 1:
            NSLog(@"CANCEL");
            break;
    }

}

@end