从2个视图控制器传递数据，不带段

protocol DataDelegate: class {
    func sendData(data: Any)
}

class TargetViewController: UIViewController {
    weak var delegate: DataDelegate?
    
    // 在需要传递数据的地方调用代理方法
    func sendDataToSourceViewController() {
        delegate?.sendData(data: "Hello World")
    }
}

class SourceViewController: UIViewController, DataDelegate {
    func sendData(data: Any) {
        // 处理传递过来的数据
        print(data)
    }
    
    func goToTargetViewController() {
        let targetVC = TargetViewController()
        targetVC.delegate = self
        navigationController?.pushViewController(targetVC, animated: true)
    }
}

class TargetViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        NotificationCenter.default.addObserver(self, selector: #selector(handleNotification(_:)), name: Notification.Name("DataNotification"), object: nil)
    }
    
    @objc func handleNotification(_ notification: Notification) {
        if let data = notification.object as? Any {
            // 处理传递过来的数据
            print(data)
        }
    }
}

class SourceViewController: UIViewController {
    func sendDataToTargetViewController() {
        let data = "Hello World"
        NotificationCenter.default.post(name: Notification.Name("DataNotification"), object: data)
    }
}

class DataManager {
    static let shared = DataManager()
    
    var data: Any?
    
    private init() {}
}

class SourceViewController: UIViewController {
    func sendDataToTargetViewController() {
        DataManager.shared.data = "Hello World"
    }
}

class TargetViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        if let data = DataManager.shared.data {
            // 处理传递过来的数据
            print(data)
        }
    }
}