Unnecessary "observe" warning about swift-composable-architecture HOT 1 CLOSED

@nmalevich We recently added this runtime warning because nested observes can have unintended consequences. In this case, a viewDidLoad is evaluated in the same stack as the presenting view controller's observe, which means all child state evaluated in the child controller's observe will be observed by the parent.

To work around the problem, you can move observe into viewWillAppear instead, and manage the lifetime of the observation token, or you can dispatch the observation a tick in viewDidLoad:

DispatchQueue.main.async {
  observe { [weak self] in
    …
  }
}

We're still deciding if this warning is too heavy-handed, but we don't consider it a bug at the moment. Because of this I'm going to convert this to a discussion.

from swift-composable-architecture.