[ios] How to enable back/left swipe gesture in UINavigationController after setting leftBarButtonItem?

Swift 3:

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    self.navigationController?.interactivePopGestureRecognizer?.delegate = self
}

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    return true
}

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    return (otherGestureRecognizer is UIScreenEdgePanGestureRecognizer)
}

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