redid lock pin page with pin control.

src/App/Controls/PinControl.cs

@@ -0,0 +1,45 @@
+using System;
+using Bit.App.Models.Page;
+using Xamarin.Forms;
+
+namespace Bit.App.Controls
+{
+    public class PinControl
+    {
+        private Action _pinEnteredAction;
+
+        public PinControl(Action pinEnteredAction)
+        {
+            _pinEnteredAction = pinEnteredAction;
+
+            Label = new Label
+            {
+                HorizontalTextAlignment = TextAlignment.Center,
+                FontSize = 30,
+                TextColor = Color.FromHex("333333"),
+                FontFamily = "Courier"
+            };
+            Label.SetBinding<PinPageModel>(Label.TextProperty, s => s.LabelText);
+
+            Entry = new ExtendedEntry
+            {
+                Keyboard = Keyboard.Numeric,
+                IsVisible = false,
+                MaxLength = 4
+            };
+            Entry.SetBinding<PinPageModel>(Xamarin.Forms.Entry.TextProperty, s => s.PIN);
+            Entry.TextChanged += PinEntry_TextChanged;
+        }
+
+        private void PinEntry_TextChanged(object sender, TextChangedEventArgs e)
+        {
+            if(e.NewTextValue.Length >= 4)
+            {
+                _pinEnteredAction();
+            }
+        }
+
+        public Label Label { get; set; }
+        public ExtendedEntry Entry { get; set; }
+    }
+}