缩放动画

-(void)exChangeOut:(UIView *)changeOutView dur:(CFTimeInterval)dur

{

CAKeyframeAnimation * animation;

animation = [CAKeyframeAnimation animationWithKeyPath:@"transform"];

animation.duration = dur;

//animation.delegate = self;

animation.removedOnCompletion = NO;

animation.fillMode = kCAFillModeForwards;

NSMutableArray *values = [NSMutableArray array];

[values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.2, 0.2, 0.1)]];

//[values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.2, 1.2, 1.0)]];

//[values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.9, 0.9, 0.9)]];

[values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(0.5, 0.5, 0.5)]];

[values addObject:[NSValue valueWithCATransform3D:CATransform3DMakeScale(1.0, 1.0, 1.0)]];

animation.values = values;

animation.timingFunction = [CAMediaTimingFunction functionWithName: @"easeInEaseOut"];

animation.delegate=self;

[changeOutView.layer addAnimation:animation forKey:@"animationLayer"];

}