Scenes.Authentication.swift

extension Authentication {

    public typealias Scene = (
        viewController: UIViewController,
        token: SafeSignal<Token>
    )

    public func createScene() -> Scene {

        let vc = ViewController.Authentication()

        let credentials = combineLatest(
            vc.usernameTextField.reactive.text.ignoreNil(),
            vc.passwordTextField.reactive.text.ignoreNil()
        )

        vc.loginButton.reactive.tap
            .with(latestFrom: credentials) { $1 }
            .observe(with: self.credentials)
            .dispose(in: vc.reactive.bag)

        return (vc, token)
    }
}