title: Animation like Radar Objective C
body: <p>How i can do a UIView animation like a radar?
  I already have a UIView with the circles created with drawrect, but how i can create a line, doing a clock animation?</p>
  
  <p>Like the image below : 
  <img src="https://i.stack.imgur.com/i9RzE.jpg" alt="enter image description here"></p>