我在做一个像Path那种向右滑动，显示出一个导航菜单。
我用过两种方式，一种是

[UIView beginAnimations:nil context:@"view_animation"];
    [UIView setAnimationDuration:0.3];
    self.view.left = 200.0f; // setLeft 是我自己定义的方法
    [UIView commitAnimations];

另一种：

self.view.layer.anchorPoint = CGPointZero;
    self.view.layer.frame.left = 200.0f;
    CAKeyframeAnimation *pathAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
    pathAnimation.duration = 0.3f;
    UIBezierPath *path = [UIBezierPath bezierPath];
    [path moveToPoint:CGPointMake(0.0f, 0.0f)];
    [path addLineToPoint:CGPointMake(200.0f, 0.0f)];
    pathAnimation.path = path.CGPath;
    pathAnimation.calculationMode = kCAAnimationLinear;
    [self.view.layer addAnimation:pathAnimation forKey:@"view_animation"];

但是这两种方法，貌似都有一点点卡。而且最近，我更新了网易新闻的客户端，网易新闻的客户端这个操作非常流畅，有可能是怎么实现的呢？