将2个PHFetchResults组合在一起

Question

Swift和iOS开发新手。有人能告诉我如何将两次调用的结果合并到PHAssetCollection.fetchAssetCollectionsWithType？具体而言，我试图在一个列表中包含标准相册和智能相册。

感谢

Answer 1

我不知道这是否是一个最佳实践或什么，但我需要做一些事情今天这个样子，画面显示如下工作：

@property NSMutableArray<PHAssetCollection *> *collections; 

... 

/* Get albums of interest */ 
PHFetchResult *albums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype: ... options: ...]; 
/* Get smart albums of interest (in my case, the Camera Roll) */ 
PHFetchResult *cameraRoll = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options: ...]; 
/* Load albums into collections member */ 
for (NSUInteger i = 0; i < albums.count; ++i) 
    [self.collections addObject:[albums objectAtIndex:i]]; 
/* Load Camera Roll into collections member */ 
[self.collections addObject:[cameraRoll firstObject]]; 

只记得初始化您的收藏成员在添加对象之前。

Answer 2

您可以使用PHAsset的fetchAssetsWithLocalIdentifiers：options：api。 首先获得一张专辑：

PHFetchResult *album = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype: ... options: ...]; 

遍历它：

for (PHAsset *asset in album) {  
    [self.localIDList addObject:asset.localIdentifier]; 
} 

使用此您需要的每个专辑。最后...

PHFetchResult *fetchResult = [PHAsset fetchAssetsWithLocalIdentifiers:self.localIDList options:nil];