NEW! Master Swift design patterns with my latest book! >>

How to control which screen edges trigger system gestures using preferredScreenEdgesDeferringSystemGestures

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.

Available from iOS 11.0 – learn more in my book Practical iOS 11

Did this solution work for you? Please pass it on!

Other people are reading…

About the Swift Knowledge Base

This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.

Help support Hacking with Swift

This site is funded by Hacking with Swift supporters who buy my e-books. If you can, please support my work – it comes packed with bonus material!

MASTER SWIFT NOW
Buy Practical iOS 12 Buy Pro Swift Buy Swift Design Patterns Buy Practical iOS 11 Buy Swift Coding Challenges Buy Server-Side Swift (Vapor Edition) Buy Server-Side Swift (Kitura Edition) Buy Hacking with macOS Buy Advanced iOS Volume One Buy Hacking with watchOS Buy Hacking with tvOS Buy Hacking with Swift Buy Dive Into SpriteKit Buy Swift in Sixty Seconds Buy Objective-C for Swift Developers Buy Beyond Code

Was this page useful? Let me know!

Click here to visit the Hacking with Swift store >>