`observe(on:)` doesn't run on the given scheduler.

[Sebastiano Catellani]

Hi all!

In my code, I have an Action created in the main thread that I need to run on a background scheduler.
This is how it looks like:

let anAction = Action { (Void) -> SignalProducer<Void, Error> in
      return SignalProducer<Void, Error> { observer, _ in
            // Some magic code
      }
}

If I call the action in this way, my magic code runs on the main tread`:

anAction.apply(()).observe(on: scheduler).start()

Instead, in this case, it runs on the given scheduler.

anAction.apply(()).start(on: scheduler).start()

How come? Is it how it's supposed to work or is it a bug?

[Matt Diephouse]

Yes, that's the difference between .start(on:) and .observe(on:). 🙂

[Sebastiano Catellani]

Good to know! I personally found the description a bit misleading.

Forward all events onto the given scheduler, instead of whichever scheduler they originally arrived upon.
What is supposed to do then?

Thanks for the quick answer 😉