如何从嵌入在导航控制器中的视图控制器接收信息

let navigationController = UINavigationController(rootViewController: yourViewController)

if let navigationController = self.navigationController {
    // 在这里可以访问导航控制器的属性和方法
}

protocol YourViewControllerDelegate: class {
    func didReceiveInformation(_ information: String)
}

weak var delegate: YourViewControllerDelegate?

delegate?.didReceiveInformation("Hello, World!")

yourViewController.delegate = self

extension YourNavigationController: YourViewControllerDelegate {
    func didReceiveInformation(_ information: String) {
        // 在这里处理接收到的信息
    }
}

var informationHandler: ((String) -> Void)?

informationHandler?("Hello, World!")

yourViewController.informationHandler = { information in
    // 在这里处理接收到的信息
}