title: How to make UIView animation sequence repeat and autoreverse
body: <p>How to make this complex animation repeat and autoreverse?
  Is there any way to add options UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat to this animation sequence?</p>
  
  <pre><code>   [UIView animateWithDuration:1.0f animations:^{
  
          someView.frame = someFrame1;
  
      } completion:^(BOOL finished) {
  
          [UIView animateWithDuration:0.5f animations:^{
  
              someView.frame = someFrame2;
  
          } completion:nil];
  
      }];
  </code></pre>