public void ObjectUsageTest()
{
var diff = new NSDiffableDataSourceSnapshot <NSNumber, NSUuid> ();
diff.AppendSections(new NSNumber [] { NSNumber.FromNInt(1) });
diff.AppendItems(new NSUuid [] { new NSUuid() }, NSNumber.FromNInt(1));
Assert.That(diff.NumberOfSections, Is.GreaterThan((nint)0), "Sections");
Assert.That(diff.GetNumberOfItems(NSNumber.FromNInt(1)), Is.GreaterThan((nint)0), "Items");
}
void ConfigureDataSource()
{
dataSource = new UICollectionViewDiffableDataSource <NSNumber, NSNumber> (collectionView, CellProviderHandler);
// initial data
var itemsPerSection = 5;
var sections = Enumerable.Range(0, 5).Select(i => NSNumber.FromInt32(i)).ToArray();
currentSnapshot = new NSDiffableDataSourceSnapshot <NSNumber, NSNumber> ();
var itemOffset = 0;
foreach (var section in sections)
{
currentSnapshot.AppendSections(new [] { section });
var items = Enumerable.Range(itemOffset, itemsPerSection).Select(i => NSNumber.FromInt32(i)).ToArray();
currentSnapshot.AppendItems(items);
itemOffset += itemsPerSection;
}
dataSource.ApplySnapshot(currentSnapshot, false);
UICollectionViewCell CellProviderHandler(UICollectionView collectionView, NSIndexPath indexPath, NSObject obj)
{
var sectionId = currentSnapshot.SectionIdentifiers [indexPath.Section];
var numberOfItemsInSection = currentSnapshot.GetNumberOfItems(sectionId);
var isLastCell = indexPath.Item + 1 == numberOfItemsInSection;
// Get a cell of the desired kind.
var cell = collectionView.DequeueReusableCell(ListCell.Key, indexPath) as ListCell;
// Populate the cell with our item description.
cell.Label.Text = $"{indexPath.Section}, {indexPath.Row}";
cell.SeparatorView.Hidden = isLastCell;
// Return the cell.
return(cell);
}
}