Question

我有故事板设置，所有视图控制器扩展导航控制器，类NavigationController: UINavigationController, UIViewControllerTransitioningDelegate，导航控制器设置自定义导航栏，类CustomNavigationBar:UINavigationBar这是NavigationController的代码

class NavigationController: UINavigationController, UIViewControllerTransitioningDelegate {

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

以下是CustomNavigationBar

的代码

class CustomNavigationBar: UINavigationBar {

    override func awakeFromNib() {
        var font = UIFont(name: "Montserrat-Light", size: 17)!
        if "ar" == userLocale() {
            font = UIFont(name: "DroidSansArabic", size: 17)!
        }
        let attribtutes = [
            NSFontAttributeName: font,
            NSForegroundColorAttributeName: UIColor.black,
            NSKernAttributeName: 5.0
            ] as [String : Any]
        UINavigationBar.appearance().titleTextAttributes = attribtutes
        UINavigationBar.appearance().tintColor = UIColor.black
        UINavigationBar.appearance().backgroundColor = UIColor.white

        let image = UIImage(named: "back-btn")
        UIBarButtonItem.appearance().setBackButtonTitlePositionAdjustment(UIOffsetMake(0, -66), for: .default)
        UINavigationBar.appearance().backIndicatorImage = image
    }
}

到目前为止，我现在想要添加一个带有自定义视图的右侧栏导航项。我尝试在NavigationController::viewDidLoad()

中添加以下代码

let customView:UIView = UIView()
customView.backgroundColor = .green
customView.frame = CGRect(x: 0, y: 0, width: 100, height: 100)
let item = UIBarButtonItem(customView: customView)
self.navigationItem.setRightBarButton(item, animated: false)

出于某种原因，这并未显示在导航菜单中。我哪里错了？

Answer 1

您需要在基本视图控制器中添加自定义导航按钮代码部分，因为每个viewController都有自己的navigationItem，这就是为什么您的自定义按钮未显示

您需要根据需要使用BaseViewController类，然后从BaseViewController继承所有viewController，只需在viewDidLoad

中添加导航按钮自定义代码一次

像这样

class BaseViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        let customView:UIView = UIView()
        customView.backgroundColor = .green
        customView.frame = CGRect(x: 0, y: 0, width: 100, height: 100)
        let item = UIBarButtonItem(customView: customView)
        self.navigationItem.setRightBarButton(item, animated: false) 
    }

}

Answer 2

你可以使你的NavigationController类符合UINavigationControllerDelegate协议，并在navigationController中修改目标控制器的navigationItem（_ navigationController：UINavigationController，willShow viewController：UIViewController，animated：Bool）方法：

extension RootNavigationController: UINavigationControllerDelegate {
func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {
    if let viewController = viewController as? YOURCONTROLLER {
        viewController.navigationItem.setRightBarButton(YOURITEM, animated: false) 
    }
}

在NavigationController中添加右键

2 个答案: