#keyPath(MyView.property) should do it, I’d think.
Charles
> On Jul 25, 2017, at 11:16 AM, Manfred Schubert via swift-users
> <swift-users@swift.org> wrote:
>
> How can I cast a path segment within #keyPath() ?
>
> For example in the following code:
>
> ——
>
> import Cocoa
>
> class MyView: NSView {
> var property: String?
> }
>
> class MyViewController: NSViewController {
>
> var viewProperty: String? {
> return (view as! MyView).property
> // 1)
> }
>
> override class func keyPathsForValuesAffectingValue(forKey key: String) ->
> Set<String> {
> var keyPaths = super.keyPathsForValuesAffectingValue(forKey: key)
>
> switch key {
> case #keyPath(viewProperty):
> keyPaths.formUnion(#keyPath(view.property)) // 2)
> default:
> break
> }
>
> return keyPaths
> }
> }
>
> ——
>
> In the line marked 1) I can cast view to MyView to access a property. In the
> line marked 2) I don't know how to perform that cast, and without I get the
> error "Type 'NSView' has no member 'property'".
>
> How can I solve this problem?
>
>
> Thanks,
>
> Manfred
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