CustomNavigationPageRenderer.cs

[assembly:ExportRenderer(typeof(CustomNavigationPage),typeof(CustomNavigationPageRenderer))]
namespace Common.Controls.iOS
{
    public class CustomNavigationPageRenderer : NavigationRenderer
    {
        protected override void OnElementChanged(VisualElementChangedEventArgs e)
        {
            base.OnElementChanged(e);
            if (e.OldElement != null)
            {
                return;
            }

            e.NewElement.PropertyChanged += NewElement_PropertyChanged;
        }

        private void NewElement_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            if (e.PropertyName != nameof(SlackNavigationPage.ShowStatusBar))
            {
                return;
            }
            var page = (SlackNavigationPage)Element;
            UIApplication.SharedApplication.SetStatusBarHidden(!page.ShowStatusBar,UIStatusBarAnimation.Slide);
            SetNeedsStatusBarAppearanceUpdate();
        }

        public override void SetNeedsStatusBarAppearanceUpdate()
        {
            base.SetNeedsStatusBarAppearanceUpdate();

            var viewController = ViewController;
            while (viewController?.ParentViewController != null && viewController.ParentViewController.GetType() != typeof(PhoneMasterDetailRenderer))
            {
                viewController = ViewController.ParentViewController;
            }
            if (viewController == null || Equals(viewController, ViewController))
            {
                return;
            }
            viewController?.SetNeedsStatusBarAppearanceUpdate();
        }

        public override bool PrefersStatusBarHidden()
        {
            var page = (SlackNavigationPage)Element;

            return !page?.ShowStatusBar ?? base.PrefersStatusBarHidden();
        }

        public override UIStatusBarAnimation PreferredStatusBarUpdateAnimation => UIStatusBarAnimation.Slide;
    }
}