PageSpecific.cs

public static class PageSpecific
{
    public static readonly BindableProperty BackSwipeEnableProperty =
        BindableProperty.Create("BackSwipeEnable", typeof(bool), typeof(Page), true, BindingMode.OneTime);

    public static bool GetBackSwipeEnable(BindableObject element)
        => (bool) element.GetValue(BackSwipeEnableProperty);

    public static void SetBackSwipeEnable(BindableObject element, bool value)
        => element.SetValue(BackSwipeEnableProperty, value);

    public static bool GetBackSwipeEnable(this IPlatformElementConfiguration<iOSPlatform, Page> config)
        => GetBackSwipeEnable(config.Element);

    public static IPlatformElementConfiguration<iOSPlatform, Page> SetBackSwipeEnable(this IPlatformElementConfiguration<iOSPlatform, Page> config, bool value)
    {
        SetBackSwipeEnable(config.Element, value);
        return config;
    }
}

Xamarin.iOS.SwipeBack.cs

public class ContentPageRenderer : PageRenderer, IUIGestureRecognizerDelegate
{
    private static bool _backSwipeEnable = true;
        
    public override void ViewWillAppear(bool animated)
    {
        base.ViewWillAppear(animated);
            
        var page = (Page)Element;
        _backSwipeEnable = page?.On<iOSConfig>()?.GetBackSwipeEnable() ?? true;
            
        if (!CheckCanInteractivePopGesture() || (page != null && NavigationPage.GetHasNavigationBar(page))) 
            return;
            
        ViewController.NavigationController.InteractivePopGestureRecognizer.Delegate = this;
    }

    [Export("gestureRecognizerShouldBegin:")]
    public bool ShouldBegin(UIGestureRecognizer recognizer)
        => CheckCanInteractivePopGesture();

    private bool CheckCanInteractivePopGesture()
        => _backSwipeEnable
           && ViewController?.NavigationController?.ViewControllers?.Length > 1;
}