title: Add multiple image in same UIImageView and change them at each tap
body: <p>I'm trying to implement a UIImageView that shows different .png (organized in a NSArray) at each tap. When the tap reaches the last .png, the next tap will show the first .png and so on.
  I found an old answer here:
  <a href="https://stackoverflow.com/questions/10763579/add-4-image-in-imageview-and-change-the-picture-with-tap-or-swipe-gesture">Add 4 image in imageview and change the picture with tap or swipe gesture</a>
  that seems to go in the right direction. However, it doesn't seem to be applicable in the new XCode and there is no more possibility to ask clarifications or updates since the topic has been closed.
  Does anybody have an idea on how to subclass then entire ImageView to get the expected result?</p>