iOS Swift Combine: cancel a Set

Question

If I have stored a cancellable set into a ViewController:

private var bag = Set()

Which contains multiple subscription.

Answer 1

if you happened to subscribe to a publisher from your View controller, likely you will capture self in sink, which will make a reference to it, and won't let ARC remove your view controller later if the subscriber didn't finish, so it's, advisable to weekly capture self

---

so instead of:

   ["title"]
      .publisher
      .sink { (publishedValue) in
        self.title.text = publishedValue
    }

.store(in: &cancellable)

you should do:

   ["title"]
      .publisher
      .sink { [weak self] (publishedValue) in
        self.title.text = publishedValue
    }

.store(in: &cancellable)

thus, when View controller is removed, you won't have any retain cycle or memory leaks.