CODEWITHSUNDEEP
iosswiftcombine
sametbilgi
sametbilgi

Reputation: 602

Add delay to publisher based on value with Combine Framework in iOS

I have one publisher public let motionSubject = PassthroughSubject<Bool, Never>()

And i am listening values with

motionManager.motionSubject.sink(receiveValue: { [weak self] isMoving in
    self?.isMoving = isMoving
}).store(in: &subscription)

I want to add 2 seconds delay if the published value is "true" because I want to give 2 seconds sound feedback.

I tried to add DispatchQueue.asynafter before motionSubject.send(true) but it didn't work.

Is anyone know how can i achieve this?

Thanks.

Upvotes: 0

Views: 1242

Answers (1)

Mr Spring
Mr Spring

Reputation: 545

What you can use is either .throttle or .debounce, I think in your case throttle will be more beneficial since it does not pause after receiving values. so if you want to do it specifically for the true value you need to do the following:

motionManager.motionSubject
    .filter { $0 == true } // will only emit through values which answer this query
    .throttle(for: .milliseconds(2000), scheduler: DispatchQueue.main, latest: true) // will publish the latest value after 2 seconds delay since the first pulishment
    .sink(receiveValue: { [weak self] isMoving in
        self?.isMoving = isMoving
    }).store(in: &subscription)

Upvotes: 1

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