解决AssetsLibrary、无法获取本地所有相册

        本地有两个相册：相机胶卷和照片图库。后者是通过同步产生的。

    dispatch_async(dispatch_get_main_queue(), ^{        [_assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:          ^(ALAssetsGroup *group, BOOL *stop)          {            if (group) {                [self.groupArray addObject:group];                [self performSelectorOnMainThread:                 @selector(reloadTableView) withObject:nil waitUntilDone:YES];            }        } failureBlock:^(NSError *error) {            NSLog(@"Group not foun
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d!n");            self.title = @"访问照片失败"; // Photo-access is disabled.        }];    });

             通过枚举ALAssetsGroupAll类型的组别来统计相册数目，结果一直只有1个。