通过继承快速地将变量传递给第二个视图控制器

class FirstViewController: UIViewController {
    var myVariable: String = ""

    // 在某个事件触发时，跳转到第二个视图控制器
    func goToSecondViewController() {
        let secondViewController = SecondViewController()
        secondViewController.receivedVariable = myVariable
        self.navigationController?.pushViewController(secondViewController, animated: true)
    }
}

class SecondViewController: UIViewController {
    var receivedVariable: String = ""

    override func viewDidLoad() {
        super.viewDidLoad()
        // 使用 receivedVariable 进行相应操作
    }
}

protocol MyDelegate: class {
    func passVariable(_ variable: String)
}

class FirstViewController: UIViewController {
    weak var delegate: MyDelegate?

    // 在某个事件触发时，跳转到第二个视图控制器
    func goToSecondViewController() {
        let secondViewController = SecondViewController()
        secondViewController.delegate = self
        self.navigationController?.pushViewController(secondViewController, animated: true)
    }
}

extension FirstViewController: MyDelegate {
    func passVariable(_ variable: String) {
        // 在这里可以对传递的变量进行一些额外操作
        // 然后将变量传递给第二个视图控制器
        let secondViewController = SecondViewController()
        secondViewController.receivedVariable = variable
        self.navigationController?.pushViewController(secondViewController, animated: true)
    }
}

class SecondViewController: UIViewController {
    var receivedVariable: String = ""

    override func viewDidLoad() {
        super.viewDidLoad()
        // 使用 receivedVariable 进行相应操作
        // 通过代理方法将变量传递给第一个视图控制器
        delegate?.passVariable(receivedVariable)
    }
}