使用Swift在OS X上获取所有可用的文件夹元数据 [英] Getting all available folder metadata on OS X using swift

问题描述

我正在编写一个swift程序，并且我想使用swift列出给定文件夹的所有元数据.据我了解，我需要NSMetadataItem.

I'm writing a swift program, and I want to list all metadata of a given folder using swift. As I understand, I'll need NSMetadataItem. The reference doc of NSMetadataItem is not very clear to me though, so I'm unable to write a code sample here. How to list all metadata of a folder?

推荐答案

使用文件夹的NSURL初始化NSMetadataItem的新实例:

Initialize a new instance of NSMetadataItem with the folder's NSURL:

let item = NSMetadataItem(URL: folderURL)

然后安全地解开值:

if let item = item,
        attributes = item.valuesForAttributes(item.attributes) {
    print(attributes)
}

此处attributes是文件夹元数据属性的[String : AnyObject]词典，例如:

Here attributes is a [String : AnyObject] dictionary of the folder metadata attributes, like:

["_ kTimeMachineIsCreationMarker":1，"kMDItemFSCreationDate":2015-03-09 11:49:57 +0000，"_kTimeMachineOldestSnapshot":2016-01-29 14:50:21 +0000，"kMDItemFSNodeCount":4， "kMDItemFSTypeCode":0，"kMDItemFSLabel":0，"kMDItemFSContentChangeDate":2015-05-05 15:24:42 +0000，"kMDItemFSOwnerGroupID":20，"kMDItemFSFinderFlags":0，"kMDItemFSFinderFlags":共享游乐场数据，"kMDItemContentCreationDate:2015-03-09 11:49:57 +0000，"kMDItemKind":档案，"kMDItemFSIsExtensionHidden":0，"_ kTimeMachineNewestSnapshot":4001-01-01 00:00:00 +0000，"kMDItemFSOwnerUserID":501 ，"kMDItemFSInvisible":0，"kMDItemContentTypeTree":< __ NSArrayI 0x7f9fdbc05b70>( 公共文件夹， public.directory， 公共项目 ) ，"kMDItemContentModificationDate":2015-05-05 15:24:42 +0000，"kMDItemContentType":public.folder，"kMDItemDateAdded":2015-03-09 11:49:57 +0000，"kMDItemDisplayName":共享游乐场数据，"kMDItemFSCreatorCode":0]

["_kTimeMachineIsCreationMarker": 1, "kMDItemFSCreationDate": 2015-03-09 11:49:57 +0000, "_kTimeMachineOldestSnapshot": 2016-01-29 14:50:21 +0000, "kMDItemFSNodeCount": 4, "kMDItemFSTypeCode": 0, "kMDItemFSLabel": 0, "kMDItemFSContentChangeDate": 2015-05-05 15:24:42 +0000, "kMDItemFSOwnerGroupID": 20, "kMDItemFSFinderFlags": 0, "kMDItemFSName": Shared Playground Data, "kMDItemContentCreationDate": 2015-03-09 11:49:57 +0000, "kMDItemKind": Dossier, "kMDItemFSIsExtensionHidden": 0, "_kTimeMachineNewestSnapshot": 4001-01-01 00:00:00 +0000, "kMDItemFSOwnerUserID": 501, "kMDItemFSInvisible": 0, "kMDItemContentTypeTree": <__NSArrayI 0x7f9fdbc05b70>( public.folder, public.directory, public.item ) , "kMDItemContentModificationDate": 2015-05-05 15:24:42 +0000, "kMDItemContentType": public.folder, "kMDItemDateAdded": 2015-03-09 11:49:57 +0000, "kMDItemDisplayName": Shared Playground Data, "kMDItemFSCreatorCode": 0]

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