From 05f8dd04dcc0bc683e662797ddd111b3d2416469 Mon Sep 17 00:00:00 2001
From: Jammer <contact@jamsoft.co.uk>
Date: Tue, 8 Jun 2021 16:50:39 +0100
Subject: [PATCH] Fixes #629 and Tidied up the code from Jearom.

---
 .../Ios/Video/PlayerViewController.cs         | 44 ++++++++++++++++++-
 1 file changed, 42 insertions(+), 2 deletions(-)

diff --git a/MediaManager/Platforms/Ios/Video/PlayerViewController.cs b/MediaManager/Platforms/Ios/Video/PlayerViewController.cs
index 5f42a0dd..39b729fe 100644
--- a/MediaManager/Platforms/Ios/Video/PlayerViewController.cs
+++ b/MediaManager/Platforms/Ios/Video/PlayerViewController.cs
@@ -1,11 +1,24 @@
-using AVKit;
+using System;
+using AVKit;
+using CoreGraphics;
+using Foundation;
+using UIKit;
 
 namespace MediaManager.Platforms.Ios.Video
 {
     public class PlayerViewController : AVPlayerViewController
     {
+        private const string KeyPath = "contentOverlayView.frame";
+
+        private bool _savePlayer;
+
         protected static MediaManagerImplementation MediaManager => CrossMediaManager.Apple;
 
+        public PlayerViewController()
+        {
+            AddObserver(this, KeyPath, NSKeyValueObservingOptions.OldNew, Handle);
+        }
+
         public override void ViewWillAppear(bool animated)
         {
             base.ViewWillAppear(animated);
@@ -23,7 +36,34 @@ public override void ViewWillDisappear(bool animated)
                 MediaManager.MediaPlayer.VideoView = null;
             }
 
-            Player = null;
+            if (!_savePlayer)
+            {
+                Player = null;
+            }
+        }
+
+        public override void ObserveValue(NSString keyPath, NSObject ofObject, NSDictionary change, IntPtr context)
+        {
+            if (keyPath != KeyPath || change == null || change[ChangeOldKey] == null) return;
+
+            var oldNsValue = change[ChangeOldKey];
+            var newNsValue = change[ChangeNewKey];
+
+            if (oldNsValue == null || newNsValue == null) return;
+
+            var oldValue = ((NSValue) oldNsValue).CGRectValue;
+            var newValue = ((NSValue) newNsValue).CGRectValue;
+
+            if (oldValue == CGRect.Empty || oldValue == CGRect.Null || oldValue.Equals(newValue)) return;
+
+            if (UIScreen.MainScreen.Bounds.Height > UIScreen.MainScreen.Bounds.Width)
+            {
+                _savePlayer = newValue.Y >= oldValue.Y;
+            }
+            else
+            {
+                _savePlayer = newValue.Height >= UIScreen.MainScreen.Bounds.Height;
+            }
         }
     }
 }