Xamarin.ios CollectionView Delete and Insert Items - visual-studio

Question

I am currently developing an iphone app with xamarin in visual studio. I'm a beginner..
I use a CollectionView. This has a list and includes 8 items with different ID's in the CollectionViewSource.cs:
ProductCategoryList.Add (new ProductCategorys () {Categoryid = 1, ProductCategoryName = "testname", ProductCategoryImage = UIImage.FromFile ( "productcat / maincat / testpic.jpg")});
Now I would like, if an item is pressed, delete All Items and refill it.
In the ProductCategoryCollectionDelegate.cs i have:
Public override Boolean ShouldSelectItem (UICollectionView collectionView, NSIndexPath indexPath)
For the delete and insert I have found these 2 methods
Public void DeleteItems (NSIndexPath [] indexPaths)
Public void InsertItems (NSIndexPath [] indexPaths)
(The xamarin Documentation is very scarce)
How can I use this 2 metodes to completely empty the list and add new items?
thanks for help

Answer 1

I've taken a TableView instead of the CollectionView.
With this function it is possible to directly delete items in the Tablesource class:
public override void CommitEditingStyle(UITableView tableView,
UITableViewCellEditingStyle editingStyle,
Foundation.NSIndexPath indexPath)
{
switch (editingStyle)
{
case UITableViewCellEditingStyle.Delete:
AppDelegate.DAUtil.setBasketItemStatusByBasketID(
basketitems[indexPath.Row].ZBASKETID, "2");
// remove the item from the underlying data source
basketitems.RemoveAt(indexPath.Row);
// delete the row from the table
tableView.DeleteRows(new NSIndexPath[] { indexPath },
UITableViewRowAnimation.Fade);
break;
case UITableViewCellEditingStyle.None:
Console.WriteLine("CommitEditingStyle:None called");
break;
}
}
public override bool CanEditRow(UITableView tableView,
NSIndexPath indexPath)
{
return true;
// return false if you wish to disable editing
// for a specific indexPath or for all rows
}
The Source of the Table is a List. Alternatively, you can reload the TableSource with:
tablename.ReloadData();