public Task <IEnumerable <MediaAsset> > Query(MediaTypes mediaTypes, DateTimeOffset date)
{
var tcs = new TaskCompletionSource <IEnumerable <MediaAsset> >();
Task.Run(() =>
{
var filter = "creationDate >= %@ && " + GetFilter(mediaTypes);
var fetchOptions = new PHFetchOptions
{
IncludeHiddenAssets = false,
IncludeAllBurstAssets = false,
Predicate = NSPredicate.FromFormat(filter, (NSDate)date.LocalDateTime),
SortDescriptors = new [] {
new NSSortDescriptor("creationDate", false)
}
};
var fetchAssets = PHAsset
.FetchAssets(fetchOptions)
.OfType <PHAsset>()
.ToArray();
var options = new PHAssetResourceRequestOptions
{
NetworkAccessAllowed = false
};
var imageCache = new PHCachingImageManager();
imageCache.StartCaching(
fetchAssets,
PHImageManager.MaximumSize,
PHImageContentMode.Default,
new PHImageRequestOptions
{
NetworkAccessAllowed = false
}
);
var assets = new List <MediaAsset>(fetchAssets.Count());
foreach (var asset in fetchAssets)
{
//result.MediaType
//result.Hidden
//result.Duration
//result.LocalIdentifier
//result.Location;
//result.ModificationDate
//result.PixelHeight;
//result.PixelWidth;
//result.CreationDate
switch (asset.MediaType)
{
case PHAssetMediaType.Image:
imageCache.RequestImageData(
asset,
new PHImageRequestOptions
{
},
(data, fn, orientation, dict) => { }
);
break;
case PHAssetMediaType.Video:
imageCache.RequestAvAsset(
asset,
new PHVideoRequestOptions
{
NetworkAccessAllowed = false,
DeliveryMode = PHVideoRequestOptionsDeliveryMode.HighQualityFormat
},
(ass, mix, dict) => { }
);
break;
case PHAssetMediaType.Audio:
break;
}
}
imageCache.StopCaching();
tcs.SetResult(assets);
});
return(tcs.Task);
}