title: iOS - Safe Area Layout not work on iOS 9 and iOS 10
body: <p>Here is the constraints:<p>
  <a href="https://i.stack.imgur.com/NyFEE.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NyFEE.png" alt="enter image description here"></a></p>
  
  <p>It works fine on iOS11, but doesn't work on iOS9 and iOS 10.<p>
  <a href="https://i.stack.imgur.com/CbHS8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/CbHS8.png" alt="enter image description here"></a></p>
  
  <p>You can download the example over <a href="https://github.com/lifution/SafeAreaLayoutTest" rel="nofollow noreferrer">here</a>.<p></p>
  
  <h3>Note: The UISwitch must be added to the RedView and use the Safe Area Layout.</h3>