我想在我的 iOS 应用程序中使用 Soroush Khanlou 协调器模式 ( http://khanlou.com )。我的问题是如何通过协调器将数据传递回我的第一个视图控制器？在使用协调器模式之前，我使用委托（协议）将数据从第二个视图控制器传递回第一个视图控制器，因为我的第一个视图控制器负责创建和呈现第二个视图控制器，这不是一个好的解决方案。所以我决定使用协调器从我的视图控制器中删除应用程序导航的工作。这是场景：
class FirstViewController: UIViewController {
weak var coordinator: MainCoordinator?
func showSecondViewController(data: Data) {
coordinator?.presentSecondViewController(data: data) {[weak self] in
guard let self = self else { return }
//Do something
}
}
class MainCoordinator: NSObject, Coordinator {
var childCoordinators = [Coordinator]()
var navigationController: UINavigationController
init(navigationController: UINavigationController) {
self.navigationController = navigationController
}
func start(completion: (() -> Void)?) {
navigationController.delegate = self
let firstViewController = FirstViewController.instantiate()
firstViewController.coordinator = self
navigationController.pushViewController(firstViewController, animated: false)
}
func presentSecondViewController(data: Data, completion: @escaping () -> Void) {
let child = SecondCoordinator(data: data, navigationController: navigationController)
childCoordinators.append(child)
child.parentCoordinator = self
child.start() {
completion()
}
}
func refresh(data: SomeDataType) {
//data from second view controller is here but I don't know how to pass it to my first view controller
//there is no reference to my first view controller
//what is the best way to pass data back?
}
}
class SecondCoordinator: Coordinator {
weak var parentCoordinator: MainCoordinator?
var childCoordinators = [Coordinator]()
var navigationController: UINavigationController
var data: Data!
init(navigationController: UINavigationController) {
self.navigationController = navigationController
}
convenience init(data: Data, navigationController: UINavigationController) {
self.init(navigationController: navigationController)
self.data = data
}
func start(completion: (() -> Void)?) {
let vc = SecondViewController(data: data)
vc.coordinator = self
vc.delegate = self. //here I used delegate to get data from second view controller to pass it to first view controller
navigationController.present(vc, animated: true) {
completion!()
}
}
}
extension SecondCoordinator: SecondViewControllerDelegate {
func refresh(data: SomeDataType) {
parentCoordinator?.refresh(data: data) // I need to pass this data to my first view controller
}
}