openURL from App Extension

Question

On iOS 8 beta 2 it should be possible to use openUrl from app extension as written into the release notes:

Answer 1

Accepted solution only works in Today extensions, a working solution in Swift 3.1 (tested in iOS10) for other extension-types:

You need to create your own URL Scheme, then add this function to your ViewController and call it with openURL("myScheme://myIdentifier")

//  Function must be named exactly like this so a selector can be found by the compiler!
//  Anyway - it's another selector in another instance that would be "performed" instead.
func openURL(_ url: URL) -> Bool {
    var responder: UIResponder? = self
    while responder != nil {
        if let application = responder as? UIApplication {
            return application.perform(#selector(openURL(_:)), with: url) != nil
        }
        responder = responder?.next
    }
    return false
}