问题
For an iPad-only app or a universal app, the "Requires full screen" option tells Xcode/iOS whether the app supports iPad multitasking feature introduced in iOS 9. But the "Requires full screen" option is also present if it's an iPhone-only app. In this case, what is the impact of this option?
回答1:
There is no impact at all. Apple engineers thinks that its not required to hide, or may be Plus phones will get landscape slide over in later iOS versions :)
From the documentation:
To opt out of being eligible to participate in Slide Over and Split View, add the UIRequiresFullScreen key to your Xcode project’s Info.plist file and apply the Boolean value YES.
回答2:
Normally, you would need to support both portrait and landscape orientation in your app.If your app is landscape only or portrait only, then the app validation fails with:
warning: All interface orientations must be supported unless the app requires full screen.
And as KingofBliss noted, setting this to YES will also stop your app from running in a split view.
It is a useful setting for games that run full screen in landscape only.
来源：https://stackoverflow.com/questions/34608826/what-is-the-impact-of-the-requires-full-screen-option-in-xcode-for-an-iphone-o