将视频添加到自定义照片集合返回错误

Posted 2023-05-07

【中文标题】将视频添加到自定义照片集合返回错误

【英文标题】：Adding video to custom Photos collection returning error

【发布时间】：2016-03-20 23:54:17

【问题描述】：

我正在使用以下代码将视频导出到自定义照片集：

 phphotoLibrary *photoLibrary = [PHPhotoLibrary sharedPhotoLibrary];
__block PHAssetCollection *album;

PHFetchResult *fetchResult = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAny options:nil];

for( int i = 0; i < fetchResult.count; i++)

    PHAssetCollection *collection = [fetchResult objectAtIndex:i];

    if([collection.localizedTitle isEqualToString:@"Pose Pro"])
    
        album = collection;
        break;
    


if( !album )

    __block PHObjectPlaceholder *placeHolder;

    [photoLibrary performChanges:^
        PHAssetCollectionChangeRequest *changeRequest = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:@"Pose Pro"];

        placeHolder = changeRequest.placeholderForCreatedAssetCollection;
     completionHandler:^(BOOL success, NSError * _Nullable error) 
        PHFetchResult *fetchResult = [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[placeHolder.localIdentifier] options:nil];

        album = fetchResult.firstObject;
    ];



[photoLibrary performChanges:^
    PHAssetChangeRequest *assetChangeRequest = [PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:_videoURL];
    PHObjectPlaceholder *assetChangePlaceHolder = assetChangeRequest.placeholderForCreatedAsset;
    PHFetchResult *videoAssets = [PHAsset fetchAssetsInAssetCollection:album options:nil];

    PHAssetCollectionChangeRequest *albumChangeRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:album assets:videoAssets];
    [albumChangeRequest addAssets:@[assetChangePlaceHolder]];
 completionHandler:^(BOOL success, NSError * _Nullable error) 
    NSLog(@"Error: %@", [error localizedDescription]);
];

当此代码运行时，我收到以下错误消息：

Error Domain=NSCocoaErrorDomain Code=-1 "(null)"

此代码看起来与其他代码示例非常相似。有谁知道我做错了什么？

【参考方案1】：

我想通了。视频 URL 引用的是视频的包含文件夹，而不是实际的视频本身。