POP-一个点击带有放大还原的动画效果

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    POPSpringAnimation *scaleAnimation = [POPSpringAnimation animation];
    scaleAnimation.property = [POPAnimatableProperty propertyWithName:kPOPViewScaleXY];//宽高改变
    scaleAnimation.toValue = [NSValue valueWithCGSize:CGSizeMake(1.3, 1.3)];//1.3倍
    [self pop_addAnimation:scaleAnimation forKey:@"scaleAnimationKey"];//执行动画
    scaleAnimation.completionBlock = ^(POPAnimation *animation,BOOL finish) { //动画回调
        POPSpringAnimation *scaleAnimation = [POPSpringAnimation animation];
        scaleAnimation.springBounciness = 16;    // value between 0-20
        scaleAnimation.springSpeed = 14;     // value between 0-20
        scaleAnimation.property = [POPAnimatableProperty propertyWithName:kPOPViewScaleXY];
        scaleAnimation.toValue = [NSValue valueWithCGSize:CGSizeMake(1.0, 1.0)];
        [self pop_addAnimation:scaleAnimation forKey:@"scaleAnimationKey"];
    };
}