ios - Swift 弱委托(delegate)

Question

我的代码:

public func start() {
    let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)

    guard let listVC = storyboard.instantiateViewController(withIdentifier: "ListVC") as? ListVC else { return }
    let viewModel = ListViewModel(dependencies: appDependencies)
    viewModel.delegate = self
    listVC.listViewModel = viewModel

    navigationController?.pushViewController(listVC, animated: true)
}


protocol ListViewModelDelegate: class {
    func needChangeScreen(cellViewModel: UserCellViewModel)
}

final class ListViewModel {

  weak var delegate: ListViewModelDelegate?

    func userPressed(at index: IndexPath) {
        delegate?.needChangeScreen(cellViewModel: cellViewModels[index.row])
    }
}

用户按下是从 UIViewController 调用的，然后我想向协调器发送回调以启动另一个协调器但委托(delegate)？始终为零。我知道委托(delegate)应该很弱，但在这种情况下对我不起作用。有什么想法吗？

Answer 1

好吧，我已经修复了，但我不知道它好吗。

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    let navigationController = UINavigationController()
    navigationController.setNavigationBarHidden(true, animated: false)
    window?.rootViewController = navigationController
    let appDependencies = configureAppDependencies()
    let coordinator = AppCoordinator(navigationController: navigationController, appDependencies: appDependencies)
    coordinator.start()
    window?.makeKeyAndVisible()

    return true
}

那是我的应用程序委托(delegate)函数(在 AppCoordinator 中创建启动并推送 ListCoordinator)，但是当我更改让协调器例如 var 时:

var coordinator: AppCoordinator?

弱委托(delegate)不为零，一切正常。