title: iOS : how to use an asset with a shadow as a button image and make the shadow part not tappable?
body: <p>I have an asset representing a button with a shadow below. I want to make only the blue part tappable. Is there an easy way to do so?</p>
  
  <p><a href="https://i.stack.imgur.com/op0Jb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/op0Jb.png" alt="enter image description here"></a></p>
  
  <p>Thanks.</p>