title: Create Floating Action Button in iOS
body: <p>I want to create a floating action button. This button is like an add button on Google mail in android, if we tapped then the screen goes dark and showed a few sub-button with good animation. This is the example in <a href="https://github.com/yoavlt/LiquidFloatingActionButton" rel="nofollow noreferrer">github</a></p>
  
  <p><a href="https://i.stack.imgur.com/GqvYe.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GqvYe.png" alt="floating button"></a></p>
  
  <p>At first, I did search at cocoacontrols but found nothing so I decide to create my own.
  But I have no clue how to do that, so my question is how to create that? </p>
  
  <p>Any help or pointer to some useful link will appreciated. Thank you!</p>