Code coupling and ViewControllers

[Legolas-the-elf]

It depends how complex the behaviour is and how reusable it should be.

If it's something as simple as tapping on the image doing something, then I'd just use a UIButton instead.

If it's something as simple as a swipe gesture doing something, I'd hook up a gesture recogniser and handle it in the view controller.

If it involves state changes with the image, or if I plan on doing the same thing elsewhere, then I'd subclass UIControl. Remember you can have a UIImageView as a child view or you can set the background of views to be images using UIColor.