Question

我创建了CustomNavigationController并添加了一些常用方法来向其中添加UIBarButtonItems。现在，我想从我的各种viewControllers中调用这些方法。

所以我的问题是-如何从任何其他viewController调用属于customNavigationController的方法。

我可以通过以下方式在 objectiveC 中实现此目标：

[(CustomNavigationController *)self.navigationController addLogoutButtonWithVC:self actionLogoutHandler:@selector(actionLogoutHandler)];

其中“ addLogoutButtonWithVC ”是方法，该方法属于CustomNavigationController。

我正在Swift的上述几行中尝试过，但没有运气。

[注意：嵌入时，我已经用情节提要中的CustomNavigationController替换了NavigationController，所以现在所有的navigationController都只指向CustomNavigationController]

“ 更新：CustomNavigationController中的addLogoutButtonWithViewController和actionLogoutHandler声明”

func addLogoutButtonWithViewController(viewCont : UIViewController , selLogout : Selector)  {
    currentController = viewCont
    var barButtonItem : UIBarButtonItem?
    barButtonItem = UIBarButtonItem(image: UIImage(named: "Logout.png"), style: UIBarButtonItemStyle.plain, target: self, action: Selector("actionLogoutHandler"))

   self.navigationController?.navigationItem.rightBarButtonItem = barButtonItem
}

@objc func actionLogoutHandler()  {
    print("Inside logout")
    currentController?.navigationController?.popToRootViewController(animated: true)
}

在这方面的任何帮助都将受到高度赞赏。

Answer 1

它看起来应该像：

if let nav = self.navigationController as? CustomNavigationController { nav.addLogoutButton(withVC: self, actionLogoutHandler:#selector(CustomNavigationController .actionLogoutHandler(_:)) }

Answer 2

您应该按以下方式尝试我的代码。

您需要导航控制器的对象并用于设置按钮目标。

    if let navigationcontroller = self.navigationController as? CustomNavigationController {
    navigationcontroller.addLogoutButton(withVC: self,
                        actionLogoutHandler:#selector(navigationcontroller.actionLogoutHandler(_:))
}

    @objc func actionLogoutHandler()  {
    print("Inside logout")
    self.popToRootViewController(animated: true)
}

Answer 3

尝试一下：

guard let customNavigationController = self.navigationController as? CustomNavigationController else { return }
customNavigationController.addLogoutButtonWithVC()

如何从任何ViewController访问CustomNavigationController的方法？

3 个答案: