sharee.bike-App/Meinkonrad/TINK/View/Bike/ILockItBike.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using TINK.Model.Bikes.Bike.BluetoothLock;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace TINK.View.Bike
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class ILockItBike : ViewCell
    {
        public ILockItBike()
        {
            InitializeComponent();
        }

        protected override void OnBindingContextChanged()
        {
            base.OnBindingContextChanged();

            if (Device.RuntimePlatform != Device.iOS)
                // Update of size is only required for iOS.
                return;

            var viewModel = BindingContext as TINK.ViewModel.Bikes.Bike.BluetoothLock.BikeViewModel;
            if (viewModel == null)
                return;

            viewModel.PropertyChanged += (sender, e) =>
            {
                if (e.PropertyName == nameof(TINK.ViewModel.Bikes.Bike.BC.RequestHandler.Base<IBikeInfoMutable>.IsButtonVisible)
                || e.PropertyName == nameof(TINK.ViewModel.Bikes.Bike.BluetoothLock.RequestHandler.Base.IsLockitButtonVisible))
                {
                    // Force update of view cell on iOS.
                    // https://hausource.visualstudio.com/TINK/_workitems/edit/132
                    ForceUpdateSize();
                }
            };
        }
    }
}