title: how to create an animation fade in UIImageView from left to right (alpha gradient)
body: <p>how to create an animation fade in UIImageView from left to right.</p>
  
  <p>from left to right i mean alpha gradient , not move from left to right.</p>
  
  <p>thanks for any help</p>
  
  <p>like this
  <img src="https://i.stack.imgur.com/h5zvh.gif" alt="enter image description here"></p>