iOS App Freezes on PushViewController

Solution 1:

We have faced the same problem couple of weeks back. And for our problem we narrowed it down to left-edge pop gesture recogniser. You can try and check if you can reproduce this problem using below steps

• Try using the left edge pop gesture when there are no view controllers below it (i.e on root view controllers, your VC-Home controller)
• Try clicking on any UI elements after this.

If you are able to reproduce the freeze, try disabling the interactivePopGestureRecognizer when the view controller stack have only one view controller.

Refer to this question for more details. Below is the code from the link for ease of reference.

- (void)navigationController:(UINavigationController *)navigationController
   didShowViewController:(UIViewController *)viewController
                animated:(BOOL)animate
{
    if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)])
{
        if (self.viewControllers.count > 1)
        {
            self.interactivePopGestureRecognizer.enabled = YES;
        }
        else
        {
            self.interactivePopGestureRecognizer.enabled = NO;
        }
    }
}

Solution 2:

Great answer by @Penkey Suresh! Saved my day! Here's a SWIFT 3 version with a small addition that made the difference for me:

    func navigationController(_ navigationController: UINavigationController, didShow viewController: UIViewController, animated: Bool) {


    if (navigationController.viewControllers.count > 1)
    {
         self.navigationController?.interactivePopGestureRecognizer?.delegate = self
        navigationController.interactivePopGestureRecognizer?.isEnabled = true;
    }
    else
    {
         self.navigationController?.interactivePopGestureRecognizer?.delegate = nil
        navigationController.interactivePopGestureRecognizer?.isEnabled = false;
    }
}

Just don't forget to add UINavigationControllerDelegate and set the navigationController?.delegate = self Another important part is to assign the interactivePopGestureRecognizer to self or to nil accordingly.