RxSwift: Observable while a button holds down

Question

How to create Observable which streams an event repeatedly while a button holds down?

Answer 1

To continue on rootcoder response, I had a situation where I had to recognize one longpress greater than three seconds

 let signinLongpress = signinButton.rx.controlEvent([.touchDown])
    signinLongpress
        .flatMapLatest { _ in
            Observable.interval(3, scheduler: MainScheduler.instance)
                .take(1)
        }
        .subscribe(onNext:{ _ in print("do fun stuff only once when longpress detected")})
        .disposed(by: disposeBag)