Question

我目前有一个CustomTabBarController类和一个CustomNavBarController类。

标签栏有五个标签，工作正常。导航栏类在导航栏的右侧添加了三个按钮（主页/消息/配置文件）。单击主页按钮时，将触发以下功能。

CustomNavBarController.swift （只有tappedHome函数）

func tappedHome(sender: UIButton) {
     // Go to home page (tab bar index 0)
}

这是我的AppDelegate和CustomTabBar文件。

AppDelegate.swift

    window?.rootViewController = CustomTabBarController()
    let tabBar: UITabBarController = self.window?.rootViewController as! UITabBarController
    tabBar.selectedIndex = 0

CustomTabBarController.swift

class CustomTabBarController: UITabBarController, UITabBarControllerDelegate {

override func viewDidLoad() {

    super.viewDidLoad()

    self.delegate = self

    self.viewControllers = [createDummyNavControllerWithTitle("News", imageName: "icon_news", viewController: MainController()),
                            createDummyNavControllerWithTitle("Games", imageName: "icon_games", viewController: GamesController()),
                            createDummyNavControllerWithTitle("Students", imageName: "icon_students", viewController: StudentsController()),
                            createDummyNavControllerWithTitle("Ranking", imageName: "icon_rank", viewController: StatsController()),
                            createDummyNavControllerWithTitle("Info", imageName: "icon_info", viewController: InfoController())]
}

func tabBarController(tabbarController: UITabBarController, didSelectViewController viewController: UIViewController) {

     self.title = viewController.title
}

// Shortcut function for the tab bar items
private func createDummyNavControllerWithTitle(title: String, imageName: String, viewController: UIViewController) -> UINavigationController {

    viewController.title = title

    let navController = UINavigationController(rootViewController: viewController)
    navController.tabBarItem.title = title
    navController.tabBarItem.image = UIImage(named: imageName)?.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)

    return navController
}
}

当我点击主页按钮时，如何告诉CustomNavBarController.swift中的函数加载标签栏的第一个索引？

PS：我之所以想要两种方式实际返回主页是因为标签栏在任何情况下都不会显示。

Answer 1

在tappedHome(_:)方法中执行以下代码应该可以解决问题：

let appDelegate  = UIApplication.sharedApplication().delegate as! AppDelegate
let tabBarController = appDelegate.window!.rootViewController as! UITabBarController
tabBarController.selectedIndex = 0

Swift：如何通过按导航栏按钮访问标签栏项目

1 个答案: