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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