RxSwift custom LongPress gesture

Reactive+longPress.swift

import RxSwift

extension Reactive where Base: UIButton {
    var longPress: Observable<Int> {
        return controlEvent(.touchDown)
            .flatMapLatest { _ in
                Observable.timer(.milliseconds(500), scheduler: MainScheduler.instance)
                    .takeUntil(self.controlEvent(.touchUpInside))
            }
    }
}