AppDelegate returning handled state in methods

[chanki31]

Consider the following

extension AppDelegate {
    func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey: Any] = [:]) -> Bool {
        viewStore.send(.appDelegate(.open(url)))
        return true
    }
}

I'm trying to find a way to return the handled state when the above method is called by the system using ComposableArchitecture. Any thoughts?

[mbrandonw]

One possibility is to hold the state that you want to return in your domain (I think in this case it would be AppState), mutate that state when .open(url) action is sent, and then access that state after sending the action. This is possible since sending actions is synchronous, which we outline a few reasons why this is in our FAQ but this is another good reason to do it.

Here's some sample code:

struct AppState: Equatable {
  ...
  var didOpenUrl = false
}

enum AppAction {
  ...
  case open(URL)
}

let appReducer = Reducer<AppState, AppAction, AppEnvironment> { state, action, environment in 
  switch action {
  ...

  case let .open(url):
    // Logic to handle url
    // ...
    state.didOpenUrl = true // or false if url was not handled
    return .none
  }
}

extension AppDelegate {
  func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey: Any] = [:]) -> Bool {
    viewStore.send(.open(url))
    return viewStore.didOpenUrl
  }
}

[chanki31]

I must have missed the point where sending actions are sync, thanks for this much appreciated