Enable Swipe Gesture in XF for iOS when Navigation Bar hidden

Background

Recently I got one case from customer to resolve the below issue：

If we set NavigationBar to hidden status in Xamarin.Forms, then iOS gesture for return will also be disabled.

Code as below:

NavigationPage.SetHasNavigationBar(this, false);

Solution

In native iOS application, we can call the below function to make sure the Swipe gesture always be available to use:

[self.navigationController.interactivePopGestureRecognizer setDelegate:nil];

This is obviously a platform-specific code, so it’s also quite straightforward to think about the solution in Xamarin.Forms.
We will rewrite the PageRenderer to achieve:

public class BaseCoreRenderer: PageRenderer
{
    public override void ViewWillAppear(bool animated)
    {
        base.ViewDidAppear(animated);
        ViewController.NavigationController.InteractivePopGestureRecognizer.Enabled = true;
        ViewController.NavigationController.InteractivePopGestureRecognizer.Delegate = new UIGestureRecognizerDelegate();
    }
}

After testing, this can resolve the issue as expected.