Swift:反斜杠点"\"的作用是什么.意思是?

swift key path expression \MyViewModel.filterString

let sub = NotificationCenter.default
    .publisher(for: NSControl.textDidChangeNotification, object: filterField)
    .map( { ($0.object as! NSTextField).stringValue } )
    .filter( { $0.unicodeScalars.allSatisfy({CharacterSet.alphanumerics.contains($0)}) } )
    .debounce(for: .milliseconds(500), scheduler: RunLoop.main)
    .receive(on: RunLoop.main)
    .assign(to:\MyViewModel.filterString, on: myViewModel)

截屏2022-05-18 18.07.47.png

What is a KeyPath in Swift
https://sarunw.com/posts/what-is-keypath-in-swift/