Mvvmcross Rotate180TargetBinding

Rotate180TargetBinding.cs

    /// <summary>
    /// Usage:
    /// set.Bind(AnyView).For(Rotate180TargetBinding.Name).To(vm => vm.AnyBooleanValue);
    /// </summary>
    public class Rotate180TargetBinding : MvxTargetBinding
    {
        private readonly WeakReference<UIView> weakView;

        public const string Name = "Rotate180";

        public static void Register(IMvxTargetBindingFactoryRegistry registry)
        {
            registry.RegisterCustomBindingFactory<UIView>(Name, view => new Rotate180TargetBinding(view));
        }

        public override Type TargetType => typeof(UIView);

        public override MvxBindingMode DefaultMode => MvxBindingMode.OneWay;

        public Rotate180TargetBinding(UIView target) : base(target)
        {
            weakView = new WeakReference<UIView>(target);
        }

        public override void SetValue(object value)
        {
            var isOn = value.ConvertToBoolean();

            UIView view;
            if (!weakView.TryGetTarget(out view))
                return;

            UIView.Animate(.4, 0, UIViewAnimationOptions.CurveEaseInOut, () =>
            {
                view.Transform = isOn ? CGAffineTransform.MakeRotation((nfloat)Math.PI-0.01f) : CGAffineTransform.MakeIdentity();
            }, null);
        }
    }