InteractivePopGestureRecognizer causing app freezing

Question

In my app I have different controllers. When I push controller1 to navigation controller and swipe to back, all works good. But, if I push navigation controller1, and into contr

Answer 1

I had problem when swipe back on first controller and then tap on tableViewCell, I think that force touch swipe from edge is registering swipe back before switches app, sometimes UI get stuck, sometimes when I swipe back it starts entering on destination controller. I solved problem with this extension, it worked for me and it is simple solution. Swift 4.2

extension UINavigationController:UINavigationControllerDelegate {

    open override func viewDidLoad() {
        super.viewDidLoad()
        self.delegate = self
    }

    public func navigationController(_ navigationController: UINavigationController, didShow viewController: UIViewController, animated: Bool) {
        if responds(to: #selector(getter: self.interactivePopGestureRecognizer)) {
            if viewControllers.count > 1 {
                interactivePopGestureRecognizer?.isEnabled = true
            } else {
                interactivePopGestureRecognizer?.isEnabled = false
            }
        }
    }
}

Answer 2

I had similar problem with freezing interface when using swipe-to-pop gesture. In my case the problem was in controller1.viewDidAppear I was disabling swipe gesture: self.navigationController.interactivePopGestureRecognizer.enabled = NO. So when user started to swipe back from contorller2, controller1.viewDidAppear was triggered and gesture was disabled, right during it's work.

I solved this by setting self.navigationController.interactivePopGestureRecognizer.delegate = self in controller1 and implementing gestureRecognizerShouldBegin:, instead of disabling gesture recognizer:

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer {
    if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)] &&
            gestureRecognizer == self.navigationController.interactivePopGestureRecognizer) {
        return NO;
    }
    return YES;
}

Answer 3

Swift 4:

Set the delegate,

self.navigationController?.interactivePopGestureRecognizer?.delegate = self

Implement the delegate method,

extension YourVC: UIGestureRecognizerDelegate{
    func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        if gestureRecognizer == self.navigationController?.interactivePopGestureRecognizer && conditionToDisableTheGesture {
            return false
        }else{
            return true
        }
    }

}