ios - 获取 ALAssetGroup 中的照片和视频的计数

Question

我像这样枚举我的 ALAssetGroup:

ALAssetsLibraryGroupsEnumerationResultsBlock listGroupBlock = ^(ALAssetsGroup *group, BOOL *stop) {

    if (group.isEditable){
        NSLog(@"group is %@", group);
        [group setAssetsFilter:[ALAssetsFilter allPhotos]];
        [groups addObject:group];
    }

这会将组过滤为仅包含在其 .numberOfAssets 中的照片。但是，我想要同时照片计数和视频计数。如果不第二次枚举整个事情，我将如何做到这一点？

Answer 1

ALAssetsLibrary *al = [[ALAssetsLibrary alloc]init];
    [al enumerateGroupsWithTypes:ALAssetsGroupAlbum usingBlock:^(ALAssetsGroup *group, BOOL *stop)
     {
         if ([[group valueForProperty:ALAssetsGroupPropertyName]isEqualToString:@"MyAlbumName"]) {
             NSLog(@"in album");
             int nrAssets=[group numberOfAssets];

             __block int countVideo;
             __block int countPhoto;

            countPhoto=countVideo=0;
             [group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop)
              {

                 if ([[asset valueForProperty:ALAssetPropertyType]isEqualToString:ALAssetTypeVideo]) {
                          NSLog(@"eVideo ... count++");
                         countVideo++;
}
                else if(asset valueForProperty:ALAssetPropertyType]isEqualToString:AlAssetTypeVideo]){
                       NSLog(@"EPhoto ... ");
                       countPhoto++;
}

       }];
         }


     }
                    failureBlock:^(NSError *error) { NSLog(@"Boom!!!");}
     ];

我将此代码用于特定专辑，但您可以针对所有专辑进行修改，希望对您有所帮助:)