[iOS] Allow VC renderers of FlyoutPage to specify UIStatusBarStyle (#13143)

* [Controls] Add reproduction sample for issue #13053

* [iOS] Internal ChildViewController should specify the real renderer to override StatusBarStyle

* Update Xamarin.Forms.ControlGallery.iOS.csproj

* [iOS] Use index to find the correct ChildViewControllers

Co-authored-by: Javier Suárez <[email protected]>

Author: rmarinho

Xamarin.Forms.ControlGallery.iOS/AppDelegate.cs

@@ -9,6 +9,7 @@
 using UIKit;
 using Xamarin.Forms;
 using Xamarin.Forms.ControlGallery.iOS;
+using Xamarin.Forms.ControlGallery.iOS.CustomRenderers;
 using Xamarin.Forms.Controls;
 using Xamarin.Forms.Controls.Issues;
 using Xamarin.Forms.Platform.iOS;
@@ -17,6 +18,8 @@
 [assembly: Dependency(typeof(TestCloudService))]
 [assembly: Dependency(typeof(CacheService))]
 [assembly: ExportRenderer(typeof(DisposePage), typeof(DisposePageRenderer))]
+[assembly: ExportRenderer(typeof(CoreFlyoutView), typeof(FlyoutPageStatusRenderer))]
+[assembly: ExportRenderer(typeof(CoreNavigationPage), typeof(DetailPageStatusBarRenderer))]
 [assembly: ExportRenderer(typeof(DisposeLabel), typeof(DisposeLabelRenderer))]
 [assembly: ExportEffect(typeof(BorderEffect), nameof(BorderEffect))]
 namespace Xamarin.Forms.ControlGallery.iOS

Xamarin.Forms.ControlGallery.iOS/CustomRenderers/UIStatusBarStyleRenderer.cs

@@ -0,0 +1,22 @@
+using UIKit;
+using Xamarin.Forms.Platform.iOS;
+
+namespace Xamarin.Forms.ControlGallery.iOS.CustomRenderers
+{
+	public class DetailPageStatusBarRenderer : NavigationRenderer
+	{
+		public override UIStatusBarStyle PreferredStatusBarStyle()
+		{
+			return UIStatusBarStyle.DarkContent;
+		}
+	}
+
+	public class FlyoutPageStatusRenderer : PageRenderer
+	{
+		public override UIStatusBarStyle PreferredStatusBarStyle()
+		{
+			return UIStatusBarStyle.LightContent;
+		}
+	}
+
+}

Xamarin.Forms.ControlGallery.iOS/Xamarin.Forms.ControlGallery.iOS.csproj

@@ -145,6 +145,7 @@
     <Compile Include="CustomEffects\FooEffect.cs" />
     <Compile Include="_10337CustomRenderer.cs" />
     <Compile Include="_11132CustomRenderer.cs" />
+    <Compile Include="CustomRenderers\UIStatusBarStyleRenderer.cs" />
     <Compile Include="CustomRenderers\_12372CustomRenderer.cs" />
     <Compile Include="CustomRenderers\_DemoShellPageCustomRenderer.cs" />
     <Compile Include="CustomRenderers\_ModalShellPageCustomRenderer.cs" />

Xamarin.Forms.Controls/App.cs

@@ -109,17 +109,13 @@ async Task TestMainPageSwitches()
 
 		public Page CreateDefaultMainPage()
 		{
-			var layout = new StackLayout { BackgroundColor = Color.Red };
-			layout.Children.Add(new Label { Text = "This is master Page" });
-			var master = new ContentPage { Title = "Flyout", Content = layout, BackgroundColor = Color.SkyBlue, IconImageSource = "menuIcon" };
-			master.On<iOS>().SetUseSafeArea(true);
 			var mdp = new FlyoutPage
 			{
 				AutomationId = DefaultMainPageId,
-				Flyout = master,
+				Flyout = CoreGallery.GetFlyoutPage(),
 				Detail = CoreGallery.GetMainPage()
 			};
-			master.IconImageSource.AutomationId = "btnMDPAutomationID";
+		
 			mdp.SetAutomationPropertiesName("Main page");
 			mdp.SetAutomationPropertiesHelpText("Main page help text");
 			mdp.Flyout.IconImageSource.SetAutomationPropertiesHelpText("This as MDP icon");

Xamarin.Forms.Controls/CoreGallery.cs

@@ -81,8 +81,23 @@ public CoreFlyoutPage()
 			Detail = detailPage;
 		}
 	}
+
 	[Preserve(AllMembers = true)]
-	internal class CoreNavigationPage : NavigationPage
+	public class CoreFlyoutView : ContentPage
+	{
+		public CoreFlyoutView()
+		{
+			On<iOS>().SetUseSafeArea(true);
+			Title = "Flyout";
+			Content = new StackLayout { BackgroundColor = Color.Red, Children = { new Label { Text = "This is master Page" } } };
+			BackgroundColor = Color.SkyBlue;
+			IconImageSource = "menuIcon";
+			IconImageSource.AutomationId = "btnMDPAutomationID";
+		}
+	}
+
+	[Preserve(AllMembers = true)]
+	public class CoreNavigationPage : NavigationPage
 	{
 		public CoreNavigationPage()
 		{
@@ -668,5 +683,10 @@ public static Page GetMainPage()
 		{
 			return new CoreNavigationPage();
 		}
+
+		public static Page GetFlyoutPage()
+		{
+			return new CoreFlyoutView();
+		}
 	}
 }

Xamarin.Forms.Platform.iOS/Renderers/TabletFlyoutPageRenderer.cs

@@ -1,5 +1,6 @@
 using System;
 using System.ComponentModel;
+using System.Linq;
 using CoreGraphics;
 using Foundation;
 using UIKit;
@@ -13,6 +14,11 @@ public override void ViewDidLayoutSubviews()
 			foreach (var vc in ChildViewControllers)
 				vc.View.Frame = View.Bounds;
 		}
+
+		public override UIViewController ChildViewControllerForStatusBarStyle()
+		{
+			return ChildViewControllers.Length > 0 ? ChildViewControllers[0] : base.ChildViewControllerForStatusBarStyle();
+		}
 	}
 
 	internal class EventedViewController : ChildViewController