title: How to animate while resizing UIView
body: <p>I saw some material on the web, but still can't quite get to where I want.
  I need to animate my view downwards, making it's height bigger.</p>
  
  <p>Here is my code so far. What's happening here, is that instead of my view resizing, it's just changing it's location a bit up.
  If I change the proprty instead of "bounds.size" to be "transform.scale.y", it's a little better, only this time it expands the view both up and down, not just downwards.</p>
  
  <p>Another thing I'm not of : are these keys just CALayer properties ? where I can find a list of these keys?</p>
  
  <p>I would really appreciate help here. Thanks!</p>
  
  <pre><code>int x = self.btnHead.frame.origin.x;
  int y = self.btnHead.frame.origin.y;
  int height = self.btnHead.frame.size.height;
  int width = self.btnHead.frame.size.width;
  
  
  CABasicAnimation *resizeAnimation = [CABasicAnimation animationWithKeyPath:@"bounds.size"];
  [resizeAnimation setToValue:[NSValue valueWithCGSize:CGSizeMake(width,height+50)]];
  resizeAnimation.fillMode = kCAFillModeForwards;
  resizeAnimation.removedOnCompletion = NO;
  
  CAAnimationGroup *animationGroup = [CAAnimationGroup animation];
  animationGroup.animations = [NSArray arrayWithObjects:resizeAnimation,nil];
  animationGroup.removedOnCompletion = NO;
  animationGroup.fillMode = kCAFillModeForwards;
  animationGroup.removedOnCompletion=NO;
  animationGroup.duration = 0.1;
  
  [self.btnHead.layer addAnimation:animationGroup forKey:@"animations"];
  </code></pre>
  
  <p><strong>Edit:</strong> posting my first code as requested - This will just change my view size, but won't animate , no matter the duration I enter.</p>
  
  <pre><code>    int x = self.btnHead.frame.origin.x;
      int y = self.btnHead.frame.origin.y;
      int height = self.btnHead.frame.size.height;
      int width = self.btnHead.frame.size.width;
  
  
      [UIView beginAnimations:nil context:nil];
      [UIView setAnimationDuration:10];
      CGRect rect = CGRectMake(x,y,width ,height+BUTTON_HEIGH*2);
  
      self.btnHead.frame = rect;
  
      [UIView commitAnimations];
  </code></pre>