public CollectionViewBatchAnimation(UICollectionView collectionView, int sectionIndex,
PHFetchResultChangeDetails changes)
{
_collectionView = collectionView;
_sectionIndex = sectionIndex;
_changes = changes;
}
private PHFetchResult AdjustAssets(PHFetchResult assets, PHFetchResultChangeDetails changes)
{
if (assets == null)
{
return(null);
}
var before = assets;
assets = changes.FetchResultAfterChanges;
foreach (var asset in before.OfType <PHAsset>())
{
if (!assets.Contains(asset))
{
AllAssets.Remove(asset);
}
}
foreach (var asset in assets.OfType <PHAsset>().OrderBy(a => a.CreationDate.SecondsSinceReferenceDate))
{
if (!AllAssets.Contains(asset))
{
AllAssets.Insert(0, asset);
}
}
return(assets);
}
/// <summary>
/// Updates collection view.
/// </summary>
/// <param name="changes">Changes.</param>
/// <param name="inSection">In section.</param>
public void PerformChanges(PHFetchResultChangeDetails changes, int inSection)
{
if (changes.HasIncrementalChanges)
{
var operation = new CollectionViewBatchAnimation(_сollectionView, inSection, changes);
_serialMainQueue.AddOperation(operation.Execute);
}
else
{
_serialMainQueue.AddOperation(_сollectionView.ReloadData);
}
}
public void PhotoLibraryDidChange(PHChange changeInstance)
{
DispatchQueue.MainQueue.DispatchAsync(() => {
// Loop through the section fetch results, replacing any fetch results that have been updated.
for (int i = 0; i < sectionFetchResults.Length; i++)
{
PHFetchResultChangeDetails changeDetails = changeInstance.GetFetchResultChangeDetails(sectionFetchResults [i]);
if (changeDetails != null)
{
sectionFetchResults [i] = changeDetails.FetchResultAfterChanges;
}
}
TableView.ReloadData();
});
}
public override void PhotoLibraryDidChange(PHChange changeInstance)
{
PHFetchResultChangeDetails imageDetails = changeInstance.GetFetchResultChangeDetails(_imageFetchResult);
PHFetchResultChangeDetails videoDetails = changeInstance.GetFetchResultChangeDetails(_videoFetchResult);
List <PHObject> insertedObjects = new List <PHObject>();
if (imageDetails != null && imageDetails.InsertedObjects.Any())
{
insertedObjects.AddRange(imageDetails.InsertedObjects);
_imageFetchResult = imageDetails.FetchResultAfterChanges;
}
if (videoDetails != null && videoDetails.InsertedObjects.Any())
{
insertedObjects.AddRange(videoDetails.InsertedObjects);
_videoFetchResult = videoDetails.FetchResultAfterChanges;
}
HandleImage(insertedObjects);
}
