如何将数据从ViewController传递到UITabBarController-> UINavigationController-> ViewController

Question

我尝试将数据从ViewController发送到UITabBarController-> UINavigationController-> ViewController，并尝试了很多方法，但无法传递数据。单击按钮后，我有异步任务，然后需要向UITabBarController-ViewController加载一些数据。我已经几乎尝试了所有示例，但是找不到有效的代码。

     func AftergettingAsynchronousData(forUserID userID: String?) {

            guard let tabBarController = tabBarController else { return }
            let navController = tabBarController.viewControllers?[0] as! UINavigationController
            let exploreViewController = navController.topViewController as! ExploreViewController
            exploreViewController.userID = userID

        }

接收数据

  class ExploreViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {


        public var userID: String?

        override func viewDidLoad() {
             super.viewDidLoad()
         print("userID  \(String(describing: userID))");
        }

    }

Answer 1

尝试将navController.topViewController更改为navController.rootViewController