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想要实现的效果：1.用addChildViewController方法添加一个子控制器，并且add子控制器的view2.当横屏旋转时，仅让子控制器的view随方向改变3.横屏状态下，状态栏和系统音量调节也是横屏状态如图：竖屏状态下：
横屏状态下：
走同样的路，发现不同的人生
In override func viewWillLayoutSubviews() {} the layout will be fine
You can listen for screen rotation notifications and then transform childView
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
In override func viewWillLayoutSubviews() {} the layout will be fine
You can listen for screen rotation notifications and then transform childView