From b6e7db6ecfb094797f7d17cafdd835a75a8ffe3f Mon Sep 17 00:00:00 2001
From: Kyle Spearrin <kyle.spearrin@gmail.com>
Date: Tue, 11 Jun 2019 20:57:12 -0400
Subject: [PATCH] custom content page renderer for left nav items

---
 .../Renderers/CustomContentPageRenderer.cs    | 56 +++++++++++++++++++
 src/iOS/iOS.csproj                            |  1 +
 2 files changed, 57 insertions(+)
 create mode 100644 src/iOS/Renderers/CustomContentPageRenderer.cs

diff --git a/src/iOS/Renderers/CustomContentPageRenderer.cs b/src/iOS/Renderers/CustomContentPageRenderer.cs
new file mode 100644
index 000000000..85f1f5887
--- /dev/null
+++ b/src/iOS/Renderers/CustomContentPageRenderer.cs
@@ -0,0 +1,56 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using Bit.iOS.Renderers;
+using UIKit;
+using Xamarin.Forms;
+using Xamarin.Forms.Platform.iOS;
+
+[assembly: ExportRenderer(typeof(ContentPage), typeof(CustomContentPageRenderer))]
+namespace Bit.iOS.Renderers
+{
+    public class CustomContentPageRenderer : PageRenderer
+    {
+        public override void ViewWillAppear(bool animated)
+        {
+            base.ViewWillAppear(animated);
+            if(!(Element is ContentPage contentPage) || NavigationController == null)
+            {
+                return;
+            }
+
+            var navigationItem = NavigationController.TopViewController.NavigationItem;
+            var leftNativeButtons = (navigationItem.LeftBarButtonItems ?? new UIBarButtonItem[] { }).ToList();
+            var rightNativeButtons = (navigationItem.RightBarButtonItems ?? new UIBarButtonItem[] { }).ToList();
+            var newLeftButtons = new List<UIBarButtonItem>();
+            var newRightButtons = new List<UIBarButtonItem>();
+            foreach(var nativeItem in rightNativeButtons)
+            {
+                // Use reflection to get Xamarin private field "_item"
+                var field = nativeItem.GetType().GetField("_item", BindingFlags.NonPublic | BindingFlags.Instance);
+                if(field == null)
+                {
+                    return;
+                }
+                if(!(field.GetValue(nativeItem) is ToolbarItem info))
+                {
+                    return;
+                }
+                if(info.Priority < 0)
+                {
+                    newLeftButtons.Add(nativeItem);
+                }
+                else
+                {
+                    newRightButtons.Add(nativeItem);
+                }
+            }
+            foreach(var nativeItem in leftNativeButtons)
+            {
+                newLeftButtons.Add(nativeItem);
+            }
+            navigationItem.RightBarButtonItems = newRightButtons.ToArray();
+            navigationItem.LeftBarButtonItems = newLeftButtons.ToArray();
+        }
+    }
+}
diff --git a/src/iOS/iOS.csproj b/src/iOS/iOS.csproj
index 309cf6ead..11599996a 100644
--- a/src/iOS/iOS.csproj
+++ b/src/iOS/iOS.csproj
@@ -112,6 +112,7 @@
     <Compile Include="Main.cs" />
     <Compile Include="AppDelegate.cs" />
     <Compile Include="Migration\KeyChainStorageService.cs" />
+    <Compile Include="Renderers\CustomContentPageRenderer.cs" />
     <Compile Include="Renderers\HybridWebViewRenderer.cs" />
     <Compile Include="Services\DeviceActionService.cs" />
     <Compile Include="Services\iOSPushNotificationHandler.cs" />