视图弹出后放大又缩小的动画实现、类似于alertView效果

- ( void ) shakeToShow:( UIView *)aView{
CAKeyframeAnimation * animation = [ CAKeyframeAnimation   animationWithKeyPath : @"transform" ];
animation. duration  =  0.5 ;

NSMutableArray  *values = [ NSMutableArray   array ];
[values  addObject :[ NSValue   valueWithCATransform3D : CATransform3DMakeScale ( 0.1 ,  0.1 ,  1.0 )]];
[values  addObject :[ NSValue   valueWithCATransform3D : CATransform3DMakeScale ( 1.2 ,  1.2 ,  1.0 )]];
[values  addObject :[ NSValue   valueWithCATransform3D : CATransform3DMakeScale ( 0.9 ,  0.9 ,  1.0 )]];
[values  addObject :[ NSValue   valueWithCATransform3D : CATransform3DMakeScale ( 1.0 ,  1.0 ,  1.0 )]];
animation. values  = values;
[aView. layer   addAnimation :animation  forKey : nil ];
}