resolving warnings for obsolete APIs

src/App/Utilities/Helpers.cs

@@ -0,0 +1,26 @@
+using System;
+using Xamarin.Forms;
+
+namespace Bit.App.Utilities
+{
+    public static class Helpers
+    {
+        public static T OnPlatform<T>(T iOS = default(T), T Android = default(T),
+            T WinPhone = default(T), T Windows = default(T))
+        {
+            switch(Device.RuntimePlatform)
+            {
+                case Device.iOS:
+                    return iOS;
+                case Device.Android:
+                    return Android;
+                case Device.WinPhone:
+                    return WinPhone;
+                case Device.Windows:
+                    return Windows;
+                default:
+                    throw new Exception("Unsupported platform.");
+            }
+        }
+    }
+}