iOS 7 check

/// <summary>
/// Checks if the operating system of the phone is 7.0 or higher
/// </summary>
/// <value><c>true</c> if is iOS7; otherwise, <c>false</c>.</value>
public static bool IsiOS7
{
	get { return UIDevice.CurrentDevice.CheckSystemVersion (7, 0); }
}

User it like this:

if (Util.IsiOS7) {
	window.TintColor = UIColor.Orange;
}