Pop

/**
 pop和Core Animation的区别
 1.Core Animation的动画只能添加到layer上
 2.pop的动画能添加到任何对象
 3.pop的底层并非基于Core Animation, 是基于CADisplayLink
 4.Core Animation的动画仅仅是表象, 并不会真正修改对象的frame\size等值
 5.pop的动画实时修改对象的属性, 真正地修改了对象的属性
 */

// 按钮动画
        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];
        [anim setCompletionBlock:^(POPAnimation *anim, BOOL finished) {
        // 标语动画执行完毕, 恢复点击事件
        self.view.userInteractionEnabled = YES;
    }];