I found a super simple way for using Reaktive stre...

# reaktive

[saket]

I found a super simple way for using Reaktive streams with SwiftUI. Sharing it here in case it’s useful to others: https://gist.github.com/saket/62b1ccfc1a92c393be60a1cfd5357d98

Here’s what my usage code looks like:

struct FooView: View {
  let presenter: FooPresenter

  var body: some View {
    Present(presenter) { model ->
      Text(model.name)
    }
  }
}

[Arkadii Ivanov]

Nice! Thanks for sharing! Please mind reference cycles, because Swift don't collect them. I suspect your Present view references the presenter, which in turn references the view on subscription. Maybe weak closure will help.

[Arkadii Ivanov]

Unlike coroutines, Reaktive can be consumed from Swift with much less workarounds.

[saket]

TIL about reference cycles. Do you know if it’s possible to verify if the cycle needs to be broken manually?

I tried using weak self in the closure, but Swift says it’s not allowed for structs.

[Arkadii Ivanov]

I'm not good at Swift, I heard about a memory profiler. It should be Googlable I think. From what I know, cyclic hard references are not collected at all.

[lehakorshun]

The main issue of leak here is you are trying to access the Struct property inside the completion block which will basically create a new copy of your structure on assignment.
You can try to create weak let model before call completion block, and use it inside.

[saket]

@lehakorshun can I ask you to show me what this code would look like? My Swift skills are new and I’m not sure how to create a weak copy of model before using it inside `onReceive`’s closure.

[lehakorshun]

@saket my swift skills are not good too.

struct FooView: View {
  let presenter: FooPresenter

  var body: some View {
    weak let weakPresenter
    Present(weakPresent) { model ->
      Text(model.name)
    }
  }
}

I think it should be work, but I didn’t test it

[saket]

thank you @lehakorshun, I’ll try this out!