I'm trying to emit a sequence on a ”pulse” at a given time interval. Totally new to everything Rx, but thought this would do it:
import RxSwift
let db = DisposeBag()
_ = Observable<Int>.interval(1.0, scheduler: MainScheduler.instance)
.debug("interval")
.subscribe(onNext: {
print($0)
})
.addDisposableTo(db)
But it only outputs:
2017-09-25 06:12:41.161: interval -> subscribed
And nothing more. What am I not understanding here?
Interval Method (TimeSpan) Returns an observable sequence that produces a value after each period. Namespace: System.Reactive.Linq.
The heart of the RxSwift framework is based on observable which is also known as a sequence. Observable is the sequence of data or events which can be subscribed and can be extended by applying different Rx operators like map, filter, flatMap, etc. It can receive data asynchronously.
There is nothing wrong with your code. The dispose bag is alive as it should be. However, the playground execution ends as soon as the last instruction is run, hence the problem.
In order to tell the playground to continue running after everything was executed, you have to import PlaygroundSupport
and tell the page to continue running:
import RxSwift
import PlaygroundSupport
let db = DisposeBag()
Observable<Int>.interval(1.0, scheduler: MainScheduler.instance)
.debug("interval")
.subscribe(onNext: {
print($0)
})
.addDisposableTo(db)
PlaygroundPage.current.needsIndefiniteExecution = true
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