InteractivePopGestureRecognizer causing app freezing InteractivePopGestureRecognizer causing app freezing ios ios

InteractivePopGestureRecognizer causing app freezing

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;}

My solution was to add a delegate to the navigation controller. Then disable the pop gesture recogniser in the root view controller only. YMMV.

#pragma mark - UINavigationControllerDelegate- (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated{    BOOL isRootVC = viewController == navigationController.viewControllers.firstObject;    navigationController.interactivePopGestureRecognizer.enabled = !isRootVC;}

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            }        }    }}