UIControl touchEvent

i have implemented the following viewDidLoad() Method:

- (void)viewDidLoad {
    [super viewDidLoad];

    // loading images into the queue
    loadImagesOperationQueue = [[NSOperationQueue alloc] init];
    AFOpenFlowView *openFlow = self.view;
    theControl = [[UIControl alloc] initWithFrame:self.view.frame];
    NSString *imageName;
    btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame = CGRectMake(10, 10, 40, 40);
    [btn addTarget:self action:@selector(testMethode) forControlEvents:UIControlEventTouchUpInside];
    [btn setTitle:@"<<" forState:UIControlStateNormal];
    [btn setHidden:YES];
    [theControl addSubview:btn];

    for (int i=0; i < 10; i++) {
        imageName = [[NSString alloc] initWithFormat:@"cover_%d.jpg", i];
        imageView = [[UIImageView alloc] ini开发者_运维问答tWithImage:[UIImage imageNamed:imageName]];
        UIImage *aktuellesImage = imageView.image;
        UIImage *scaledImage = [aktuellesImage scaleToSize:CGSizeMake(100.0f, 100.0f)];
        [openFlow setImage:scaledImage forIndex:i];
//      [(AFOpenFlowView *)self.view setImage:scaledImage forIndex:i];

        [imageName release];
        [aktuellesImage release];       
    }
    [theControl addSubview:openFlow];
    [theControl setUserInteractionEnabled:YES];

    [(AFOpenFlowView *)self.view setNumberOfImages:10];
}

And the following touchesEnded() Method:

- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    [btn setHidden:NO];
}

But the touchesEnded doesn't work, and the Button will not shown when i touch the picture, does anybody know what is the Problem???

Greetings Marco

Make sure your view has user interaction enabled in order to register touches. This can be set in your View Controller thusly:

self.view.userInteractionEnabled = YES;