[6]

@objc dynamic var titleKVO: String = ""
    var titleObserver: Observable<String> {
        return rx.observe(String.self, "titleKVO", options: .new) //using an Rx wrapper for KVO we can monitor new values of 
    }

    let disposeBag = DisposeBag()

	titleObserver            
	.subscribe(onNext: { title in
                titleLabel.text = title
            })
            .disposed(by: disposeBag)
	.disposed(by: disposeBag)