When using navigationpage's InsertPageBefore method toolbar items disappear on iOS

Question

When I navigate to a page that uses a flow of NavigationPage.Navigation.InsertPageBefore(ContentPage) then NavigationPage.PopAsync().ConfigureAwait(false) the toolbar item on the global navigation page disappears but when using push/pop the tool bar always remains. This only happens on iOS.

The navigation page is a global scoped to the app level along with a master detail page in which the navigation page serves as the detail portion.

Add ToolbarItem

var toobaritemMenu = new ToolbarItem
 {
     Icon = "Screenshot",                                   
     Command = new Command(() => Device.BeginInvokeOnMainThread(() => App.MasterNavigation.PushAsync(new ContentPage(), false)))
 };
 App.MasterNavigation.ToolbarItems.Add(toobaritemMenu);

Moving to a Page Like This Causes Toolbar Item to Disappear on iOS

Device.BeginInvokeOnMainThread(() => App.MasterNavigation.Navigation.InsertPageBefore(new ContentPage(), App.MasterNavigation.CurrentPage));
Device.BeginInvokeOnMainThread(() => App.MasterNavigation.PopAsync().ConfigureAwait(false));

Is there a reason for this as it seems inconsistent since it works on Android.

Erik Erik · Accepted Answer · 2017-02-01T00:37:14

I ran into the same issue. My workaround was to change how I was manipulating the navigation stack: instead of inserting the new page and popping off the current page, push the new page onto the stack and then remove the current one:

await currentPage.Navigation.PushAsync(nextPage, animated: true);
currentPage.Navigation.RemovePage(currentPage);

You end up with the same final navigation stack, but it avoids whatever issue is causing the problem with the secondary toolbar items in iOS.

When using navigationpage's InsertPageBefore method toolbar items disappear on iOS

1 Answers