pop动画使用示例

// 弹簧动画
        POPSpringAnimation *anim = [POPSpringAnimation animationWithPropertyNamed:kPOPViewFrame];
        anim.fromValue = [NSValue valueWithCGRect:CGRectMake(buttonX, buttonBeginY, buttonW, buttonH)];
        anim.toValue = [NSValue valueWithCGRect:CGRectMake(buttonX, buttonEndY, buttonW, buttonH)];
        anim.springBounciness = XMGSpringFactor;
        anim.springSpeed = XMGSpringFactor;
        anim.beginTime = CACurrentMediaTime() + XMGAnimationDelay * i;
        [button pop_addAnimation:anim forKey:nil];