点击弹出view放大带弹簧效果的动画

-(void) animationAlert:(UIView *)view

{

CAKeyframeAnimation *popAnimation = [CAKeyframeAnimation animationWithKeyPath:@"transform"];

popAnimation.duration = 0.4;

popAnimation.values = @[[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.01f, 0.01f, 1.0f)],

[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.1f, 1.1f, 1.0f)],

[NSValue valueWithCATransform3D:CATransform3DIdentity]];

popAnimation.keyTimes = @[@0.0f, @0.5f, @0.75f, @1.0f];

popAnimation.timingFunctions = @[[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],

[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut],

[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];

[self.btn.layer addAnimation:popAnimation forKey:nil];

}