SelectedItem binding works in UWP but not in ios - xamarin.forms

Question

In my Xamarin.Forms app, I have a ListView and am binding to the SelectedItem property:
<ListView x:Name="MyListView" ItemsSource="{Binding MyItems}" IsVisible="{Binding Expanded}" SelectedItem="{Binding SelectedItem, Mode=TwoWay}" SelectionMode="Single" SeparatorVisibility="None">
<!-- not relevant code -->
</ListView>
When I run it on UWP, my SelectedItem property in my view model gets set when I select an item in the list. But not in ios. Am I doing something wrong? Or is there a work around?

Answer 1

I wrote a simple demo and it works on my side. Here is the code:
<ListView x:Name="testListView"
Style="{StaticResource ListStyle}" SelectedItem="{Binding YourSelectedItem, Mode=TwoWay}">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout>
<Label Text="{Binding Name}"/>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
Then in your view-model(viewModel should implement INotifyPropertyChanged):
class testViewModel : INotifyPropertyChanged
{
public string Name { get; set; }
private testViewModel _yourSelectedItem { get; set; }
public testViewModel YourSelectedItem
{
get
{
return _yourSelectedItem;
}
set
{
_yourSelectedItem = value;
OnPropertyChanged("YourSelectedItem");
}
}
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
public event PropertyChangedEventHandler PropertyChanged;
}
And in the MainPage, set the BindingContext = new testViewModel();:
public partial class MainPage : ContentPage
{
ObservableCollection<testViewModel> myModels = new ObservableCollection<testViewModel>();
testViewModel model;
public MainPage()
{
InitializeComponent();
myModels.Add(new testViewModel { Name = "age" });
myModels.Add(new testViewModel { Name = "gender" });
myModels.Add(new testViewModel { Name = "name" });
testListView.ItemsSource = myModels;
BindingContext = new testViewModel();
}
}
Try it and let me know if it works for you.