private void ConfigureDataSource()
{
var dataSource = new UICollectionViewDiffableDataSource <NS <Section>, NS <int> >(
collectionView: _collectionView,
cellProvider: (collectionView, indexPath, identifier) =>
{
var cell = (DummyCell)collectionView.DequeueReusableCell(DummyCell.Key, indexPath);
cell.Configure(((NS <int>)identifier).Value.ToString());
return(cell);
});
// initial data
const int ItemsPerSection = 6;
var snapshot = new NSDiffableDataSourceSnapshot <NS <Section>, NS <int> >();
EnumExtensions.Apply <Section>(section =>
{
var ns = new NS <Section>(section);
snapshot.AppendSections(new[] { ns });
var itemOffset = ((int)ns.Value) * ItemsPerSection;
var itemUpperbound = itemOffset + ItemsPerSection;
var items = Enumerable.Range(itemOffset, itemUpperbound).Select(x => new NS <int>(x)).ToArray();
snapshot.AppendItems(items);
});
dataSource.ApplySnapshot(snapshot, animatingDifferences: false);
}
public void Apply_NullAction_ThrowsArgumentNullException()
{
Assert.Throws <ArgumentNullException>(() =>
{
EnumExtensions.Apply <TestEnum>(null);
});
}