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See:https://www.hackingwithswift.com/example-code/uikit/how-to-detect-edge-swipes

override func viewDidLoad() {
    super.viewDidLoad()

    let edgePan = UIScreenEdgePanGestureRecognizer(target: self, action: #selector(screenEdgeSwiped))
    edgePan.edges = .left

    view.addGestureRecognizer(edgePan)
}

@objc func screenEdgeSwiped(_ recognizer: UIScreenEdgePanGestureRecognizer) {
    if recognizer.state == .recognized {
        print("Screen edge swiped!")
    }
}