countdown timer by `RxSwift`

Question

I need a thirty-second time counter with RxSwift. This is a duplicate question but there is no clear answer to the questions

score 11 · Accepted Answer · answered Dec 30 '19 at 08:43

11

Better approach for existing answer.

let countDown = 15 // 15 seconds 
Observable<Int>.timer(.seconds(0), period: .seconds(1), scheduler: MainScheduler.instance)
        .take(countDown+1)
        .subscribe(onNext: { timePassed in
            let count = self.countDown - timePassed
            print(count)

        }, onCompleted: {
            print("count down complete")
        })

answered Dec 30 '19 at 08:43

SanRam

936
13
13

Why +1 in `take()`? – Skoua Feb 13 '20 at 23:58
1

@Skoua for the observable to complete including 0. – Xchord May 04 '20 at 08:15

score 10 · Answer 2 · answered Sep 24 '20 at 13:39

This is an even cleaner solution in my opinion (Swift 5.3). The onNext closure receives the time remaining so there is no need to perform a calculation. This also makes it easier to use the takeUntil operator to terminate the subscription when the value is equal to 0.

let countdown = 30
Observable<Int>.interval(.seconds(1), scheduler: MainScheduler.instance)
    .map { countdown - $0 }
    .takeUntil(.inclusive, predicate: { $0 == 0 })
    .subscribe(onNext: { value in
        print(value)
    }, onCompleted: {
        print("completed")
    }).disposed(by: disposeBag)

score 2 · Answer 3 · answered Sep 24 '19 at 14:24

2

With 5.0 version of RxSwift you can do:

    Observable<Int>.interval(.seconds(30), scheduler: MainScheduler.instance).bind { timePassed in

    }.disposed(by: yourDisposeBag)

answered Sep 24 '19 at 14:24

Andrew

471
3
13

This will always emit per 30 seconds if you don't kill it. – Bawenang Rukmoko Pardian Putra Sep 21 '22 at 09:48

countdown timer by `RxSwift`

3 Answers3

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