From ba7b66b83a83328f56e0676efcff5d3c553ac6bf Mon Sep 17 00:00:00 2001
From: "E.Z. Hart" <hartez@users.noreply.github.com>
Date: Thu, 12 Jan 2017 14:43:57 -0700
Subject: Fix out-of-memory crashes on iOS when creating maps (#467)

* Pool map views on iOS 10 to avoid memory issues
Clean up disposal implementation for map renderer, delegate

* Enable 39489 test on iOS

* Add missing XF Maps references

* Add missing maps reference to Windows 8.1 project

* Actually enable the test for iOS

* Fix placement of Isolate override

* Don't create a new control for ImageRenderer if NewElement is null

* Reverting fixes to ViewRenderer Dispose; have to fix that in a separate PR
---
 Xamarin.Forms.Maps.iOS/MapPool.cs | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 Xamarin.Forms.Maps.iOS/MapPool.cs

(limited to 'Xamarin.Forms.Maps.iOS/MapPool.cs')

diff --git a/Xamarin.Forms.Maps.iOS/MapPool.cs b/Xamarin.Forms.Maps.iOS/MapPool.cs
new file mode 100644
index 00000000..dc8a9c47
--- /dev/null
+++ b/Xamarin.Forms.Maps.iOS/MapPool.cs
@@ -0,0 +1,25 @@
+using System.Collections.Concurrent;
+using MapKit;
+
+namespace Xamarin.Forms.Maps.iOS
+{
+	// A static pool of MKMapView instances we can reuse 
+	internal class MapPool
+	{
+		static MapPool s_instance;
+		public static MapPool Instance => s_instance ?? (s_instance = new MapPool());
+
+		internal readonly ConcurrentQueue<MKMapView> Maps = new ConcurrentQueue<MKMapView>();
+
+		public static void Add(MKMapView mapView)
+		{
+			Instance.Maps.Enqueue(mapView);
+		}
+
+		public static MKMapView Get()
+		{
+			MKMapView mapView;
+			return Instance.Maps.TryDequeue(out mapView) ? mapView : null;
+		}
+	}
+}
\ No newline at end of file
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