IOS:如何在NSFileManager中设置文件id ?

I have a json with

我有一个json。

{
                        "FolderID": "17",
                        "FolderName": "Outdoor Look",
                        "MarkForDeletion": false,
                        "NewUpdateFolderID": null,
                        "ParentFolderID": "0"
                        },
                        {
                        "FolderID": "20",
                        "FolderName": "Sub 1",
                        "MarkForDeletion": false,
                        "NewUpdateFolderID": null,
                        "ParentFolderID": "17"
                        },
                        {
                        "FolderID": "22",
                        "FolderName": "Sub 2",
                        "MarkForDeletion": false,
                        "NewUpdateFolderID": null,
                        "ParentFolderID": "17"
                        },
{