Question

In my program, I use a scroll view as the background view. Then, I add several images on the scroll view. Also, I allow the users to touch the image in order to trigger some actions. However, the images attached on the scroll view cannot be detected when they were touched. I use the following code my the touch event:

UITouch * touch = [[event allTouches] anyObject];

Did I do something wrong? How can I solve this problem? Thank you very much!

Answer 1

You can use UIImageView to track touches, and also set myImageView.userInteractionEnabled = YES, since the default is no for imageviews.

If you want to detect a tap on the image you can do this:

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handlesSingleTap:)];
        [singleTap setNumberOfTapsRequired:1];

        [imageView addGestureRecognizer:singleTap];

and implement your selector:

- (void)handlesSingleTap:(UIGestureRecognizer *)gestureRecognizer
{
    //Handle touch
}