A simple count down timer using RxSwift

CountDownTimer.swift

import RxSwift

func count(from: Int, to: Int, quickStart: Bool) -> Observable<Int> {
    return Observable<Int>
        .timer(quickStart ? 0 : 1, period: 1, scheduler: MainScheduler.instance)
        .take(from - to + 1)
        .map { from - $0 }
}

Simple count down timer which will emit element from value from to value to.

@tomisacat it works fine, but how can I pause timer and resume?

how to count down in background mode

FYI, With the latest RxSwift the last map return () and not the elapsed time

By the way, if someone wants to do something when the timer elapses, try this:

func count(from: Int, to: Int, quickStart: Bool) -> Observable<Int> {
    return Observable<Int>
        .timer(quickStart ? 0 : 1, period: 1, scheduler: MainScheduler.instance)
        .take(from - to + 1)
        .map { from - $0 }
        .do(onCompleted: {
           // do anything when the timer elapses
       })
}