ios12.3.1屏幕镜像
If you upgraded to the latest iOS release on your iPad, only to figure out that the screen orientation lock doesn’t work anymore, here’s how to lock the screen using the new, annoying method.
如果您在iPad上升级到了最新的iOS版本，只是为了确定屏幕方向锁定不再起作用，以下是使用烦人的新方法锁定屏幕的方法。
We’re definitely irritated with Apple for making this change—the hardware screen lock was one of the best features of the iPad, and now it’s gone. At least you can still lock it.
做出此更改的确使我们为Apple感到烦恼-硬件屏幕锁定是iPad的最佳功能之一，而现在已不复存在。 至少您仍然可以锁定它。
锁定屏幕方向 (Locking the Screen Orientation)Start by holding the iPad in the direction you’d like to lock it, and then press the Home button twice quickly, like a double-click.
首先将iPad锁定在想要锁定的方向，然后快速双击Home(主页)按钮两次，就像双击一样。
The new task switcher will show up at the bottom of the screen, and then you’ll want to slide your finger over to the right to access the new screen hidden on the left.
新的任务切换器将显示在屏幕的底部，然后您将需要向右滑动手指以访问隐藏在左侧的新屏幕。
Once you can see the new screen, click the button on the bottom left-hand side of the screen, and it will lock.
一旦您可以看到新屏幕，请单击屏幕左下方的按钮，它将锁定。
If you wanted to lock the iPad in landscape mode, you’d have to hold it in landscape mode before going through all of this.
如果要将iPad锁定在横向模式，则必须先将其保持在横向模式，然后再进行所有操作。
翻译自: https://www.howtogeek.com/howto/36330/how-to-lock-the-screen-orientation-on-your-ipad-with-ios-4.2/
ios12.3.1屏幕镜像