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Mail App in iPad, when we create a new mail, the controller will be presented. But in iPadOS system, this controller can be moved, and if move it to the left side or right side, it can become a multiple window. How Apple to realize this feature?

I try a lot new API about UIViewController but it does not work.

peipei
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  • It's support for multiple scenes - new in iOS 13. See https://developer.apple.com/documentation/uikit/app_and_environment/scenes/supporting_multiple_windows_on_ipad and related documentation. – rmaddy Jul 28 '19 at 07:18
  • I can realize the feature with drag and drop API, But in Safari, the multiple tag is easily to drag, it should not press for a long time. How it realize? – peipei Jul 29 '19 at 06:31

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