title: iOS - how to implement crop image like default photo album?
body: <p>The default crop function in iPhone photo album</p>
  
  <p><img src="https://i.stack.imgur.com/fPyZ7.jpg" alt="enter image description here"></p>
  
  <p>Does any one know how to implement this? I want to crop it before <strong>Use</strong> button is tapped.</p>
  
  <p><img src="https://i.stack.imgur.com/CHFvz.jpg" alt="enter image description here"></p>