ios - 如何从自定义 View Controller 类加载初始 View Controller

Question

在我的 Storyboard中，我有一个FirstViewController，它也是一个初始 View Controller 。我的 StoryBoard 中有另一个 UIViewController，名为 BaseViewController。我在上面添加了一个 NavigationBar 。我想从 BaseViewController 派生 FirstViewController，因此我编写了以下代码。

class FirstViewController: BaseViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    } 

但是当我运行应用程序时，它没有显示BaseViewController的内容。相反，它仅加载 FirstViewController 的内容。我希望从 BaseViewController 派生的每个 UIViewControllere 都应该有它的 NavigationBar。我需要什么改变以获得这个？

Answer 1

如果您的 BaseViewController 的目的只是为 ViewController 提供导航栏。您可以将 FirstViewController(NavController 的根 Controller )嵌入到 NavigationController(设置为初始 View Controller )中。如果您想要不同的 Controller 使用不同的导航栏，您必须像我一样以编程方式设置它。

看这里-

extension UIViewController {

    func setNavBar(title : String, modType : ModuleType = .home, barHexColor : String? = nil, isBackBtn : Bool, isMenuBtn : Bool, isJummperBtn : Bool, isScreenshotBtn : Bool) {

        k_ModuleType = modType
        var barColor = "E14145"
        var arrLeftItems = [UIBarButtonItem]()
        var arrRightItems = [UIBarButtonItem]()

        if let aBarColor = barHexColor {
            barColor = aBarColor
        }

        self.navigationController?.navigationBar.isTranslucent = false
        self.navigationController?.navigationBar.barTintColor = UIColor(hexString: barColor)
        self.navigationController?.navigationBar.tintColor = UIColor.white

        if isBackBtn {
            let btnBack = UIButton(type: .custom)
            btnBack.setImage(UIImage(named: "Back2"), for: .normal)
            btnBack.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
            btnBack.addTarget(self, action: #selector(self.barBackAction(_:)), for: .touchUpInside)
            let itemBack = UIBarButtonItem(customView: btnBack)
            arrLeftItems.append(itemBack)
        }

        if isMenuBtn {
            let btnMenu = UIButton(type: .custom)
            btnMenu.setImage(UIImage(named: "menu2"), for: .normal)
            btnMenu.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
            btnMenu.addTarget(self, action: #selector(self.barMenuAction(_:)), for: .touchUpInside)
            let itemMenu = UIBarButtonItem(customView: btnMenu)
            arrLeftItems.append(itemMenu)
        }

        if isScreenshotBtn {
            let btnScreenshot = UIButton(type: .custom)
            btnScreenshot.setImage(UIImage(named: "screenshot2"), for: .normal)
            btnScreenshot.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
            btnScreenshot.addTarget(self, action: #selector(self.barScreenshotAction(_:)), for: .touchUpInside)
            let itemScreenshot = UIBarButtonItem(customView: btnScreenshot)
            arrRightItems.append(itemScreenshot)
        }

        if isJummperBtn {
            let btnJumpper = UIButton(type: .custom)
            btnJumpper.setImage(UIImage(named: "jumpper2"), for: .normal)
            btnJumpper.frame = CGRect(x: 0, y: 0, width: 30, height: 30)
            btnJumpper.addTarget(self, action: #selector(self.barJumpperAction(_:)), for: .touchUpInside)
            let itemJumpper = UIBarButtonItem(customView: btnJumpper)
            arrRightItems.append(itemJumpper)
        }

        self.navigationItem.setLeftBarButtonItems(arrLeftItems, animated: true)
        self.navigationItem.setRightBarButtonItems(arrRightItems, animated: true)

        let lblNavTitle = UILabel(frame: CGRect(x: 0, y: 0,
                                                width: DeviceType.isIPad() ? 200 : 110,
                                                height: 40))
        lblNavTitle.textAlignment  = .center
        lblNavTitle.numberOfLines = 0
        lblNavTitle.textColor = UIColor.white
        lblNavTitle.text = title
        lblNavTitle.font = UIFont.systemFont(ofSize: DeviceType.isIPad() ? 21 : 16,
                                             weight: .medium)
        lblNavTitle.backgroundColor = UIColor.clear
        self.navigationItem.titleView = lblNavTitle

        self.navigationItem.titleView?.isUserInteractionEnabled = true
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.tapTitle(_:)))
        tapGesture.numberOfTapsRequired = 1
        self.navigationItem.titleView?.addGestureRecognizer(tapGesture)
    }

然后在FirstViewController的Viewdidload()方法中

override func viewdidload()
{
   super.viewdidload()


        self.setNavBar(title            : aTitle,
                       barHexColor      : nil,
                       isBackBtn        : false,
                       isMenuBtn        : true,
                       isJummperBtn     : true,
                       isScreenshotBtn  : true)
}