Xamarin - Updating listview items as data is received - xamarin

Question

I have a Listview that requires two API calls, one for all the text data, and one for image data for each item (via byte array). I first get all the text data and show the list, with a placeholder image. I then do a loop over all the items in the list view, and for each item I retrieve its image. I'd like the Listview to update after each image is retrieved, so that slowly the images will populate down the list, 1 by 1. However, the Listview only updates as Listview items are shown for the first time. For example, I'll load 20 items, with 7 being shown (the rest need to be scrolled to). If I wait a few seconds and scroll, the 8th+ items will show the updated images. Once all 20 items have retrieved their image, the entire list will update and show all the images.
I've tried setting the ItemSource (Results) of the listview to null after each image is retrieved, which calls OnPropertyChanged(), however the list still doesn't update for each item. Here's the code:
public async Task GetImagesForResults()
{
using (var scope = App.Container.BeginLifetimeScope())
{
using (new Busy(this))
{
var peopleService = scope.Resolve<IPersonService>();
_incompleteResults = Results;
if (_incompleteResults != null && _incompleteResults.Count > 0)
{
foreach(PersonViewModel p in _incompleteResults)
{
if (StopLoading)
{
break;
}
IsBusy = false;
var peopleImage = await peopleService.GetPersonImage(p.Email);
if ((peopleImage.Error == null) && (peopleImage.Response != null))
{
p.Picture = peopleImage.Response;
p.PictureImageSource = ImageSource.FromStream(() => new MemoryStream(peopleImage.Response));
p.ShowInitials = false;
Results = null;
Results = _incompleteResults;
}
}
}
}
}
}
Thanks for the help.