我们如何将闭包传递给应用流中的任何ViewController？

typealias CallbackClosure = () -> Void

class SourceViewController: UIViewController {
    var callbackClosure: CallbackClosure?
    
    func passClosureToDestination() {
        let destinationVC = DestinationViewController()
        destinationVC.receiveClosure(closure: callbackClosure)
        navigationController?.pushViewController(destinationVC, animated: true)
    }
}

class DestinationViewController: UIViewController {
    var receivedClosure: CallbackClosure?
    
    func receiveClosure(closure: CallbackClosure?) {
        receivedClosure = closure
    }
    
    func executeClosure() {
        receivedClosure?()
    }
}

class DestinationViewController: UIViewController {
    // ...
    
    func executeClosure() {
        receivedClosure?()
    }
    
    // 在需要的地方执行闭包
    func performActionAndNotifySource() {
        // 执行特定操作
        // ...
        
        // 执行接收到的闭包
        executeClosure()
    }
}