删除相册最后一个照片

//    PHFetchResult *collectonResuts = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary options:[PHFetchOptions new]] ;

//    [collectonResuts enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {

//        PHAssetCollection *assetCollection = obj;

//        NSLog(@"locname ==%@",assetCollection.localizedTitle);

//

//        if ([assetCollection.localizedTitle isEqualToString:@"所有照片"] || [assetCollection.localizedTitle isEqualToString:@"All Photos"])  {

//            PHFetchResult *assetResult = [PHAsset fetchAssetsInAssetCollection:assetCollection options:[PHFetchOptions new]];

//            [assetResult enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {

//                NSLog(@"assetResult.count === %lu",(unsigned long)(assetResult.count-1));

//                NSLog(@"idx === %lu",(unsigned long)idx);

//                [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{

//                    //获取相册的最后一张照片

//                    if (idx == assetResult.count-1) {

//                        [PHAssetChangeRequest deleteAssets:@[obj]];

//                        NSLog(@"删除成功");

//                    }

//                    NSLog(@"assetResult.count === %lu",(unsigned long)(assetResult.count-1));

//                } completionHandler:^(BOOL success, NSError *error) {

////                    NSLog(@"success: %d", success);

////                    NSLog(@"Error: %@", error);

//                }];

//            }];

//        }

//    }];

参考网址：https://www.jianshu.com/p/ac18aa3f28c2