iOSUtils.cs

Snippet Name: iOS Utils
Platform: Xamarin.iOS
Function: Check if running iOS 8, is phone, is tall, and envoke on UI Thread

Snippet:

public static class Utils
{
    public static NSObject Invoker;

    /// <summary>
    /// Ensures the invoked on main thread.
    /// </summary>
    /// <param name="action">Action to run on main thread.</param>
    public static void EnsureInvokedOnMainThread(Action action)
    {
        if (NSThread.Current.IsMainThread)
        {
            action();
            return;
        }
        if (Invoker == null)
            Invoker = new NSObject();

        Invoker.BeginInvokeOnMainThread(() => action());
    }

    public static bool IsiOS7
    {
        get
        {
            return UIDevice.CurrentDevice.CheckSystemVersion(7, 0);
        }
    }
    
    public static bool IsiOS8
    {
        get
        {
            return UIDevice.CurrentDevice.CheckSystemVersion(8, 0);
        }
    }
    
  public static bool IsPhone
  {
    get { return UIDevice.CurrentDevice.UserInterfaceIdiom == UIUserInterfaceIdiom.Phone; }
  }

    //Check if taller than iPhone 4
  public static bool IsTallPhone
  {
    get
    {
      return IsPhone && (UIScreen.MainScreen.Bounds.Height * UIScreen.MainScreen.Scale >= 1136);
    }
  }
}


Example Use:
//Pop up items
Utils.EnsureInvokedOnMainThread (() => {
				var alertView = new UIAlertView ("Title", "Message", null, "OK");
				alertView.Show ();
			});