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Xcode – How to use RunLoop in a Command Line Tool to use Combine Timer.pubish(…)?

The solution to user Timer.publish() in a Command Line Tool app could be to use RunLoop. But I can figure out how.

If I write the following it doesn’t work more than if I don’t use RunLoop.

RunLoop.current.run()

let subscription = Timer.publish(every: 1.0, on: .main, in: .default)
    .autoconnect()
    .sink { _ in
        print("timer fired")
    }
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2

Answers


  1. Chosen as BEST ANSWER
    0

    The solution given by Ole Begemann on swift forums. Thx to him.

    import Combine
import Foundation

let subscription = Timer.publish(every: 1.0, on: .main, in: .default)
  .autoconnect()
  .sink { _ in
      print("timer fired")
  }

withExtendedLifetime(subscription) {
  RunLoop.current.run()
}

    It seams "withExtendedLifetime(x:,body:)" is needed to avoid compiler to destroy the subscription instance before the RunLoop start.


  2. 0

    The problem is merely that you are giving the commands in the wrong order. Try it like this:

    let subscription = Timer.publish(every: 1.0, on: .main, in: .default)
    .autoconnect()
    .sink { _ in
        print("timer fired")
    }
RunLoop.current.run()
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