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

Question

I got the opposite issue from here. By default in iOS7, back swipe gesture of UINavigationController\'s stack could pop the presented ViewCon

Answer 1

For those who are still having trouble with this, try separating the two lines as below.

override func viewDidLoad() {
    self.navigationController!.interactivePopGestureRecognizer!.delegate = self
    ...

override func viewWillAppear(_ animated: Bool) {
    self.navigationController!.interactivePopGestureRecognizer!.isEnabled = true
    ...

Obviously, in my app,

interactivePopGestureRecognizer!.isEnabled

got reset to false before the view was shown for some reason.