使用Apple IOS Photokit对共享相册进行排序

Question

在进行大量毫无用处的实验之前，没有人知道您是否可以使用Apple Photokit对共享相册进行排序。 我知道本机照片应用程序无法运行。

Answer 1

据您所知，您想根据添加资产的时间戳进行排序。 尝试这个：

_assets = [[NSArray alloc] init];

PHFetchOptions *options = [[PHFetchOptions alloc] init];
//Sort according to date
options.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]];
//If you want just images
options.predicate = [NSPredicate predicateWithFormat:@"mediaType == %d", PHAssetMediaTypeImage];
//Each album is an assetCollection
PHFetchResult *fetchResult = [PHAsset fetchAssetsInAssetCollection:self.assetsCollection options:options];
_assets = fetchResult;

Answer 2

您可以按任何PHAsset键（mediaType，持续时间等）进行排序。

_assets = [[NSArray alloc] init];
PHFetchOptions *options = [[PHFetchOptions alloc] init];
//Sort according to date
options.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"{PHAsset.key}" ascending:NO]];
//For example
options.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"mediaType" ascending:NO]];
//If you want just images
options.predicate = [NSPredicate predicateWithFormat:@"mediaType == %d", PHAssetMediaTypeImage];
//If you want just videos
options.predicate = [NSPredicate predicateWithFormat:@"mediaType == %d", PHAssetMediaTypeImage];
//If you want both videos and photos
// leave predicate as-is
//Each album is an assetCollection
PHFetchResult *fetchResult = [PHAsset fetchAssetsInAssetCollection:self.assetsCollection options:options];
_assets = fetchResult;

因此，您可以对相册或PHAssetCollections执行相同的操作：

 let options = PHFetchOptions()
//Sort according to date
options.sortDescriptors = [NSSortDescriptor(@"{PHAssetCollection.key}" ascending:true]
//Query collection with sort descriptor
let result:PHFetchResult = PHAssetCollection.fetchAssetCollectionsWithType(PHAssetCollectionType.Album, subtype: PHAssetCollectionSubtype.AlbumCloudShared, options: nil)