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How to Resize UIView using Core Animation in iOS?

Core Animation based on Quartz provides very simple ways to create special effects in your game or application.

The following shows how to create a Resize Effect of any UIView (e.g. UIButtonView, UIImageView etc.)

  1. +(void)resize:(UIView*)view to:(CGSize)size withDuration:(int) duration andSnapBack:(BOOL) snapBack
  2. {
  3.     // Prepare the animation from the old size to the new size
  4.     CGRect oldBounds = view.layer.bounds;
  5.     CGRect newBounds = oldBounds;
  6.     newBounds.size = size;
  7.     CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"bounds"];
  8.    
  9.    
  10.     // iOS
  11.     animation.fromValue = [NSValue valueWithCGRect:oldBounds];
  12.     animation.toValue = [NSValue valueWithCGRect:newBounds];
  13.    
  14.    
  15.     if(!snapBack)
  16.     {
  17.         // Update the layer’s bounds so the layer doesn’t snap back when the animation completes.
  18.         view.layer.bounds = newBounds;
  19.     }
  20.    
  21.     // Add the animation, overriding the implicit animation.
  22.     [view.layer addAnimation:animation forKey:@"bounds"];
  23. }
[pb_builder]

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