Implementing Scroll To Item

[Duane]

I'm trying to create a customrenderer for the ListView control to allow me to scroll to a specific item in list. I've managed to do this for Android, although I had to do reflection to get at the needed properties. But it works well enough.

I'm now trying to implement for iOS and am running into a problem finding the NSIndexPath for the selected item.

I've found the ScrollToItem method on TKListView, but it requires an NSIndexPath. I have access to the actual item from my Xamarin.Forms library, how do I translate that into an NSIndexPath?

[Stefan Nenchev]

Hi, Duane,

You can get the index of the item through the Xamarin.Forms RadListView's ItemsSource in the custom renderer. For example:

protected override void OnElementChanged(ElementChangedEventArgs<RadListView> e)
        {
           base.OnElementChanged(e);

           var FormsListView = e.NewElement as RadListView;
           var source = FormsListView.ItemsSource as List<SourceItem>;
           SourceItem item = source.Where(x => x.Name == "Test 1").FirstOrDefault();
           int indexOfItem = source.IndexOf(item);

           indexPath = NSIndexPath.FromItemSection(indexOfItem, 0);
        }

Eventually, you can use this indexPath in the ScrollToItem method.

I have attached a sample for your reference.

Regards,
Stefan Nenchev
Progress Telerik

[Duane]

Thanks Stefan, I forgot to come back and post that I figured it out. I went down a similar path, once I realized I could create the NSIndexPath it went quickly. I'll post a blog post on my solution and link it here.