title: Swift draw an arc for view background
body: <p>I'd like to draw an arc at the bottom of a view like this:</p>
  
  <p><a href="https://i.stack.imgur.com/Ioq30.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ioq30.png" alt="enter image description here"></a></p>
  
  <p>The background pattern is another matter, but I think this can be done with something like uibezierpath? I haven't had much experience with it, any starter points? Thanks</p>