Simple timer with rxSwift

Question

I\'m trying to reproduce a simple timer with RxSwift.

I have a pause/play button only that works for pause and resume.

        gameTimer         


        

Answer 1

A little trick:

class ViewController: UIViewController {

    let isRunning = Variable(true)

    override func viewDidLoad() {
        super.viewDidLoad()

        isRunning.asObservable()
            .debug("isRunning")
            .flatMapLatest {  isRunning in
                isRunning ? Observable.interval(1, scheduler: MainScheduler.instance) : .empty()
            }
            .flatMapWithIndex { (int, index) in Observable.just(index) }
            .debug("timer")
            .subscribe()
            .addDisposableTo(disposeBag)

        navigationItem.rightBarButtonItem!.rx.tap
            .subscribe(onNext: { [unowned self] in
                self.isRunning.value = !self.isRunning.value
            })
            .addDisposableTo(disposeBag)

    }
}

Result:

2016-12-17 20:53:11.408: timer -> subscribed
2016-12-17 20:53:11.414: isRunning -> subscribed
2016-12-17 20:53:11.415: isRunning -> Event next(true)
2016-12-17 20:53:12.503: timer -> Event next(0)
2016-12-17 20:53:13.488: timer -> Event next(1)
2016-12-17 20:53:14.488: timer -> Event next(2)
2016-12-17 20:53:15.488: timer -> Event next(3)
2016-12-17 20:53:16.154: isRunning -> Event next(false)
2016-12-17 20:53:23.155: isRunning -> Event next(true)
2016-12-17 20:53:24.223: timer -> Event next(4)
2016-12-17 20:53:25.229: timer -> Event next(5)
2016-12-17 20:53:26.228: timer -> Event next(6)
2016-12-17 20:53:27.220: timer -> Event next(7)
2016-12-17 20:53:28.225: timer -> Event next(8)
2016-12-17 20:53:29.221: timer -> Event next(9)
2016-12-17 20:53:29.971: isRunning -> Event next(false)