public override void PrepareForSegue(UIStoryboardSegue segue, NSObject sender)
{
var destination = (segue.DestinationViewController as UINavigationController)?.TopViewController as AssetGridViewController;
if (destination == null)
{
throw new InvalidProgramException("unexpected view controller for segue");
}
var cell = sender as UITableViewCell;
if (destination == null)
{
throw new InvalidProgramException("unexpected cell for segue");
}
destination.Title = cell.TextLabel.Text;
switch (segue.Identifier)
{
case showAllPhotos:
destination.FetchResult = allPhotos;
break;
case showCollection:
// get the asset collection for the selected row
var indexPath = TableView.IndexPathForCell(cell);
PHCollection collection = null;
switch ((Section)indexPath.Section)
{
case Section.SmartAlbums:
collection = (PHAssetCollection)smartAlbums.ObjectAt(indexPath.Row);
break;
case Section.UserCollections:
collection = (PHCollection)userCollections.ObjectAt(indexPath.Row);
break;
}
// configure the view controller with the asset collection
var assetCollection = collection as PHAssetCollection;
if (assetCollection == null)
{
throw new InvalidProgramException("expected asset collection");
}
destination.FetchResult = PHAsset.FetchAssets(assetCollection, null);
destination.AssetCollection = assetCollection;
break;
}
}
public Item this[int index] => new Item((PHAsset)_fetchResult.ObjectAt(index));