redraw stack layouts on ios tableviews

src/App/Controls/RedrawableStackLayout.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Threading.Tasks;
+using Xamarin.Forms;
+
+namespace Bit.App.Controls
+{
+    public class RedrawableStackLayout : StackLayout
+    {
+        private DateTime _lastRedraw = DateTime.MinValue;
+        private TimeSpan _redrawThreshold = TimeSpan.FromMilliseconds(1000);
+
+        public async Task RedrawIfNeededAsync(int delay = 0, bool force = false)
+        {
+            var now = DateTime.UtcNow;
+            if(Device.RuntimePlatform == Device.iOS && (force || (now - _lastRedraw) > _redrawThreshold))
+            {
+                _lastRedraw = now;
+                if(delay > 0)
+                {
+                    await Task.Delay(delay);
+                }
+
+                InvalidateLayout();
+            }
+        }
+    }
+}