使用 phphotolibrary 将图像保存到自定义图库文件夹 - iOS

Question

我正在使用以下代码将图像保存到我在 iOS 照片库中创建的自定义文件夹中：

我收到此错误：Error Domain=NSCocoaErrorDomain Code=-1 "(null)"

谁能帮我解决这个问题？

+(BOOL)saveToAlbum:(NSString*)albumName image:(UIImage*)image{
__block PHFetchResult *photosAsset;
__block PHAssetCollection *collection;
__block PHObjectPlaceholder *placeholder;
__block BOOL retStat = false;
NSData *newImageSize = UIImageJPEGRepresentation(image, 1);

[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
    PHAssetChangeRequest *assetRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:[UIImage imageWithData:newImageSize]];
    placeholder = [assetRequest placeholderForCreatedAsset];
    photosAsset = [PHAsset fetchAssetsInAssetCollection:[self findAlbumAssetCollection:albumName] options:nil];
    PHAssetCollectionChangeRequest *albumChangeRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:collection
                                                                                                                  assets:photosAsset];
    [albumChangeRequest addAssets:@[placeholder]];
} completionHandler:^(BOOL success, NSError *error) {
    if (success){
        retStat = true;
    }
    else{
        NSLog(@"%@", error);
    }}];
}

Answer 1

感谢 Mr.T 给我提示（在 albumChangeRequest 时集合为零）。这是正确的解决方案。

+(BOOL)saveToAlbum:(NSString*)albumName image:(UIImage*)image{
__block BOOL retStat = false;
NSData *newImageSize = UIImageJPEGRepresentation(image, 1);
UIImage *imageNew = [UIImage imageWithData:newImageSize];
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
     PHFetchResult *photosAsset;
     PHAssetCollection *collection = [self findAlbumAssetCollection:albumName];
     PHObjectPlaceholder *placeholder;
    placeholder = [[PHAssetChangeRequest creationRequestForAssetFromImage:imageNew] placeholderForCreatedAsset];
    photosAsset = [PHAsset fetchAssetsInAssetCollection:collection options:nil];
    PHAssetCollectionChangeRequest *albumChangeRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:collection assets:photosAsset];                                                                       
    [albumChangeRequest addAssets:@[placeholder]];
} completionHandler:^(BOOL success, NSError *error) {
    if (success){
        retStat = true;
    }
    else{
        NSLog(@"%@", error);
    }}];
return  retStat;}


+(PHAssetCollection*)findAlbumAssetCollection:(NSString*)albumName{
PHAssetCollection *collection;
PHFetchOptions *fetchOptions = [[PHFetchOptions alloc] init];
fetchOptions.predicate = [NSPredicate predicateWithFormat:@"title = %@", albumName];
collection = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum
                                                      subtype:PHAssetCollectionSubtypeAny
                                                      options:fetchOptions].firstObject;
return collection;

}

Answer 2

在这里回答，以便有人可以在 google 搜索结果中找到它并节省我浪费的时间：如果您在创建资产时遇到此错误，检查您的 phone 存储。我得到这个错误作为另一个静默错误的传播，因为我的 phone 有 0 个字节（是的，0 个字节）可用存储 space.

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