basilche

RAC(self, titleLabel.text) = RACObserve(self, title);

basilche

class ProfileManager {
     static let shared = ProfileManager()

     let usernameObservable: Observable<String>
     private let usernameSubject: BehaviorSubject<String>

     private var username: String {
        didSet {
            usernameSubject.onNext(username)
        }

basilche

let disposeBag = DisposeBag() 
let publishSubject = PublishSubject<String>()

//subscribe for changes
	publishSubject
	.subscribe(onNext: { title in
		titleLabel.text = title
	})
	.disposed(by: disposeBag)

basilche

var title: String {
        didSet {
            titleLabel.text = title
        }
    }

basilche

var title: String
var titleLabel: UILabel