private async void FinishedPickingAssets(object sender, MultiAssetEventArgs args)
{
var results = new List <MediaFile>(24);
var tcs = new TaskCompletionSource <IList <MediaFile> >();
Debug.WriteLine("User finished picking assets. {0} items selected.", args.Assets.Length);
_preselectedAssets = args.Assets;
// For demo purposes: just show all chosen pictures in order every second
foreach (var asset in _preselectedAssets)
{
// Get information about the asset, e.g. file patch
asset.RequestContentEditingInput(new PHContentEditingInputRequestOptions(),
completionHandler: (input, options) =>
{
var path = input.FullSizeImageUrl.ToString();
path = path.Replace("file://", "");
var fileName = System.IO.Path.GetFileNameWithoutExtension(path);
var ext = System.IO.Path.GetExtension(path);
var imgOption = MediaFileGetImageOptions.CreateDefaultThumb();
var thumbImageBytes = AssetImageService.GetImageBytes(asset, imgOption);
var thumbnailImagePath =
MediaFileHelper.GetOutputPath(MediaFileType.Image, "TmpMedia",
$"{fileName}-THUMBNAIL{ext}");
System.IO.File.WriteAllBytes(thumbnailImagePath, thumbImageBytes);
results.Add(new MediaFile
{
Path = path,
PreviewPath = thumbnailImagePath,
Type = MediaFileType.Image
});
});
await Task.Delay(250);
}
tcs.TrySetResult(results);
_mediaPickTcs?.TrySetResult(await tcs.Task);
_preselectedAssets = null;
}
public async Task <string> CreatePreviewPath(string path, string type)
{
await Task.Delay(TimeSpan.FromMilliseconds(100));
var fileName = System.IO.Path.GetFileNameWithoutExtension(path);
var ext = System.IO.Path.GetExtension(path);
var strs = path.Split('/');
var assetResult = PHAsset.FetchAssetsUsingLocalIdentifiers(strs, null);
var asset = assetResult.firstObject as PHAsset;
var thumbImageBytes =
AssetImageService.GetImageBytes(asset, MediaFileGetImageOptions.CreateDefaultThumb());
var thumbnailImagePath =
MediaFileHelper.GetOutputPath(MediaFileType.Image, "TmpMedia",
$"{fileName}-THUMBNAIL{ext}");
System.IO.File.WriteAllBytes(thumbnailImagePath, thumbImageBytes);
return(thumbnailImagePath);
}