UI adjustment

Pixiview.iOS/Renderers/AppShellRenderer.cs

@@ -1,5 +1,7 @@
-using System.Threading.Tasks;
+using System.Diagnostics.CodeAnalysis;
+using System.Threading.Tasks;
 using Pixiview.iOS.Renderers;
+using Pixiview.iOS.Renderers.AppShellSection;
 using Pixiview.Utils;
 using UIKit;
 using Xamarin.Forms;
@@ -14,7 +16,7 @@ namespace Pixiview.iOS.Renderers
 
         protected override IShellSectionRenderer CreateShellSectionRenderer(ShellSection shellSection)
         {
-            var renderer = base.CreateShellSectionRenderer(shellSection);
+            var renderer = new AppShellSectionRenderer(this);
             if (renderer is ShellSectionRenderer sr && Element is AppShell shell)
             {
                 shell.SetNavigationBarHeight(
@@ -24,15 +26,36 @@ namespace Pixiview.iOS.Renderers
             return renderer;
         }
 
+        [SuppressMessage("Code Notifications", "XI0002:Notifies you from using newer Apple APIs when targeting an older OS version", Justification = "<Pending>")]
+        protected override IShellItemRenderer CreateShellItemRenderer(ShellItem item)
+        {
+            var renderer = base.CreateShellItemRenderer(item);
+            if (UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
+            {
+                if (renderer.ViewController is UITabBarController controller)
+                {
+                    var tabBar = controller.TabBar;
+                    tabBar.TintColor = UIColor.SecondaryLabelColor.ColorWithAlpha(1);
+                    tabBar.UnselectedItemTintColor = UIColor.SecondaryLabelColor;
+                }
+            }
+            return renderer;
+        }
+
         protected override IShellItemTransition CreateShellItemTransition()
         {
             return new AppShellItemTransition();
         }
+
+        protected override IShellTabBarAppearanceTracker CreateTabBarAppearanceTracker()
+        {
+            return new AppShellTabBarAppearanceTracker();
+        }
     }
 
     public class AppShellItemTransition : IShellItemTransition
     {
-        [System.Diagnostics.CodeAnalysis.SuppressMessage("Code Notifications", "XI0001:Notifies you with advices on how to use Apple APIs", Justification = "<Pending>")]
+        [SuppressMessage("Code Notifications", "XI0001:Notifies you with advices on how to use Apple APIs", Justification = "<Pending>")]
         public Task Transition(IShellItemRenderer oldRenderer, IShellItemRenderer newRenderer)
         {
             var task = new TaskCompletionSource<bool>();
@@ -47,4 +70,90 @@ namespace Pixiview.iOS.Renderers
             return task.Task;
         }
     }
+
+    public class AppShellTabBarAppearanceTracker : IShellTabBarAppearanceTracker
+    {
+        UIColor _defaultBarTint;
+        UIColor _defaultTint;
+        UIColor _defaultUnselectedTint;
+
+        public void Dispose()
+        {
+        }
+
+        public void ResetAppearance(UITabBarController controller)
+        {
+            if (_defaultTint == null)
+                return;
+
+            var tabBar = controller.TabBar;
+            tabBar.BarTintColor = _defaultBarTint;
+            tabBar.TintColor = _defaultTint;
+            tabBar.UnselectedItemTintColor = _defaultUnselectedTint;
+        }
+
+        public void SetAppearance(UITabBarController controller, ShellAppearance appearance)
+        {
+            IShellAppearanceElement appearanceElement = appearance;
+            //var backgroundColor = appearanceElement.EffectiveTabBarBackgroundColor;
+            var unselectedColor = appearanceElement.EffectiveTabBarUnselectedColor;
+            var titleColor = appearanceElement.EffectiveTabBarTitleColor;
+
+            var tabBar = controller.TabBar;
+            //bool operatingSystemSupportsUnselectedTint = Forms.IsiOS10OrNewer;
+
+            if (_defaultTint == null)
+            {
+                _defaultBarTint = tabBar.BarTintColor;
+                _defaultTint = tabBar.TintColor;
+
+                //if (operatingSystemSupportsUnselectedTint)
+                {
+                    _defaultUnselectedTint = tabBar.UnselectedItemTintColor;
+                }
+            }
+
+            //if (!backgroundColor.IsDefault)
+            //    tabBar.BarTintColor = backgroundColor.ToUIColor();
+            if (!UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
+            {
+                if (!titleColor.IsDefault)
+                    tabBar.TintColor = titleColor.ToUIColor();
+
+                //if (operatingSystemSupportsUnselectedTint)
+                {
+                    if (!unselectedColor.IsDefault)
+                        tabBar.UnselectedItemTintColor = unselectedColor.ToUIColor();
+                }
+            }
+        }
+
+        public void UpdateLayout(UITabBarController controller)
+        {
+        }
+    }
+
+    public class AppShellSectionRenderer : ShellSectionRenderer
+    {
+        public AppShellSectionRenderer(IShellContext context) : base(context)
+        {
+        }
+
+        protected override IShellSectionRootRenderer CreateShellSectionRootRenderer(ShellSection shellSection, IShellContext shellContext)
+        {
+            return new AppShellSectionRootRenderer(shellSection, shellContext);
+        }
+    }
+
+    public class AppShellSectionRootRenderer : ShellSectionRootRenderer
+    {
+        public AppShellSectionRootRenderer(ShellSection shellSection, IShellContext shellContext) : base(shellSection, shellContext)
+        {
+        }
+
+        protected override IShellSectionRootHeader CreateShellSectionRootHeader(IShellContext shellContext)
+        {
+            return new AppShellSectionRootHeader(shellContext);
+        }
+    }
 }