osx - Read & Write file tag in cocoa app OS X with swift or obj-c -

is there way read/write file tags without shell commands? tried nsfilemanager , cgimagesource classes. no luck far.

an nsurl object has resource key nsurltagnameskey. value array of strings.

this swift example reads tags, adds tag foo , write tags back.

let url = nsurl(fileurlwithpath: "/path/to/file.ext") var resource : anyobject? {   try url.getresourcevalue(&resource, forkey: nsurltagnameskey)   var tags : [string]   if resource == nil {     tags = [string]()   } else {     tags = resource as! [string]   }    print(tags)   tags += ["foo"]   try url.setresourcevalue(tags, forkey: nsurltagnameskey) } catch let error nserror {   print(error) } 

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the swift 3+ version bit different. in url tagnames property get-only it's necessary bridge cast url foundation nsurl

var url = url(fileurlwithpath: "/path/to/file.ext") {     let resourcevalues = try url.resourcevalues(forkeys: [.tagnameskey])     var tags : [string]     if let tagnames = resourcevalues.tagnames {         tags = tagnames     } else {         tags = [string]()     }      tags += ["foo"]     try (url nsurl).setresourcevalue(tags, forkey: .tagnameskey)  } catch {     print(error) }