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How to control which screen edges trigger system gestures using preferredScreenEdgesDeferringSystemGestures

Swift version: 5.2

Paul Hudson    @twostraws   

iOS 11.0 was the first to showcase complex system gestures based around the iPhone X, and it’s the point now where all edges of the screen do different things on different devices.

Historically, iOS apps automatically delayed system gestures from the top and bottom edges if they were run as full screen apps – if they hid the status bar – but as of iOS 11 you should now make your view controllers override the preferredScreenEdgesDeferringSystemGestures property to tell the system which edges should delay the built-in system gestures.

For example, if you main view controller uses the bottom screen edge you might give it code like this:

override func preferredScreenEdgesDeferringSystemGestures() -> UIRectEdge {
    return [.bottom]
}

That will allow iOS to use left, right, and top edge swipes freely, but defer the system gesture for bottom swipes.

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