How to detect if image is touched

How can you detect if an image is touched in Xcode? I have looked at Apple documentation and it is really confusing... I saw:

if (CGRectContainsPoint([imageView frame], location))

but my image still won't move. I tried using touchesBegan + touchesMoved, and set the image's userInteractionIsEnabled to YES, but it still won't detect it :(

EDIT: Thank you all so much for your great suggestions! In the end, I really wanted to make it as simple as possible, and I knew that my code should work, so I kept fiddling with it, and after a good night's sleep, I realized it was a fairly simple solution:

In my touchesMoved:

    UITouch *touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView:touch.view];

    CGRect shapeRect = [imageView frame];
    CGRect dropSquareRect = [dropSquare frame];

    CGPoint touchLocation = CGPointMake(location.x, location.y);

    if (CGRectContainsPoint(shapeRect, touchLocation))
    {
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:.3];
        [imageView setCenter:touchLocation];
        [UIView commitAnimations];
    }

    if (CGRectIntersectsRect(shapeRect, dropSquareRect))
    {
        [UIView beginAnimations:nil context:nil];
        [UIView setAnimationDuration:.3];
        [UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
        self.imageView.alpha = 0;
        self.imageView.center = CGPointMake(dropSquare.center.x, dropSquare.center.y);
        self.imageView.transform = CGAffineTransformMakeScale(0.8, 0.8);
        [UIView commitAnimations];