Bridge components aren't always registered

[joemasilotti]

After debugging a few new Hotwire Native apps I've noticed a common issue. Hotwire.registerBridgeComponents() must be called before a Navigator instance is created. Otherwise, the bridge components never register for the web view.

The quick fix is to defer creation of the Navigator via a lazy variable, like so in the getting started guide:

import HotwireNative
import UIKit

let rootURL = URL(string: "https://hotwire-native-demo.dev")!

class SceneDelegate: UIResponder, UIWindowSceneDelegate {
    var window: UIWindow?

-   private let navigator = Navigator()
+   private lazy var navigator = Navigator()

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
+       Hotwire.registerBridgeComponents([...])
        window?.rootViewController = navigator.rootViewController
        navigator.route(rootURL)
    }
}

However, it isn't clear why this has to occur and isn't documented anywhere.

I don't think we can ever get registerBridgeComponents() to work after a URL has been routed. The user agent can't be changed after the request is made and that is what signifies which bridge components are registered. However, having a warning or error if you try to register after a URL has been routed could go a long way in stopping these issues.

I'm also open to other suggestions if folks have ideas!