title: UIView block animation move view left to right and back to left
body: <p>I wan't to animate a view that's shaped as an arrow, and I want it to animate from left to right, left to right and so on.. </p>
  
  <p>This code below is not working, I'm guessing I need a path, but don't know how to do that in a UIView block animation.</p>
  
  <pre><code>   [UIView animateWithDuration:.5 delay:0 options:UIViewAnimationOptionRepeat animations:^{
      controller.view.frame = frame1;
      controller.view.frame = frame2;
  
  } completion:^(BOOL finished) {
  
  }];
  </code></pre>