ios - 我正在尝试快速使用自定义委托(delegate)，但是当我想调用它的方法时，它没有被调用

Question

我一直在寻找委托(delegate)的工作原理，并尝试在我的项目中这样做。不幸的是，我实现的委托(delegate)方法从未被调用过。我正在尝试做一个滑出式导航面板。所以我所做的是放置两个 uicontainerview，一个用于滑出式导航面板，另一个用于主视图 Controller enter image description here

代码是这样的对于主视图 Controller

protocol MainViewControllerDelegate {
    func toggleSideMenu()
}

class MainViewController: UIViewController {

    var delegate: MainViewControllerDelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    // MARK: - Slide Action

    @IBAction func slideMenuTapped(_ sender: UIBarButtonItem){
        delegate?.toggleSideMenu()
        print("Slide Menu has been tapped")
    }
}

对于容器 View Controller

class ContainerVC: UIViewController {
    @IBOutlet weak var SideMenuConstraint: NSLayoutConstraint!
    @IBOutlet weak var slideMenuContainer: UIView!
    @IBOutlet weak var mainViewContainer: UIView!

    var mainViewController: MainViewController?

    var isSideMenuOpened = false

    override func viewDidLoad() {
        super.viewDidLoad()

        mainViewController = UIStoryboard.mainViewController()
        mainViewController?.delegate = self
    }
}

extension ContainerVC: MainViewControllerDelegate{
    func toggleSideMenu() {
        print("It works")
        if isSideMenuOpened{
            isSideMenuOpened = false
            SideMenuConstraint.constant = -260
            mainViewContainer.layer.shadowOpacity = 0
        } else {
            isSideMenuOpened = true
            SideMenuConstraint.constant = 0
            mainViewContainer.layer.shadowOpacity = 0.59
        }
        UIView.animate(withDuration: 0.3) {
            self.view.layoutIfNeeded()
        }
    }
}

extension UIStoryboard{
    static func mainStoryboard() -> UIStoryboard { return UIStoryboard(name: "Main", bundle: Bundle.main) }
    static func mainViewController() -> MainViewController? {
        return mainStoryboard().instantiateViewController(withIdentifier: "MainViewController") as? MainViewController
    }
}

有什么问题请告知

Answer 1

我认为原因是您将主视图 Controller 嵌入到导航 Controller 中:

let navigationController = self.childViewControllers.last as! UINavigationController
let mainViewController = navigationController.topViewController as! MainViewController
mainViewController?.delegate = self