以编程方式将视图控制器分配给选项卡栏控制器

Question

我是 swift 的新手，正在尝试使用 Apiary 的 TMDB 创建电影数据库应用程序。

我已经为一个类别创建了视图控制器的布局。但是，我计划有多个类别，但它们之间的唯一区别是我从 API 中检索的数据。例如，"now_playing" 键获取正在播放的列表，"top_rated" 键获取评分最高的电影列表。当我最初这样做时，我在 AppDelegate.swift 中创建了选项卡栏控制器，并通过使用方法 instantiateViewControllerWithIdentifier 以编程方式从情节提要中获取它们来将 ViewController 添加到其中。最后，我通过这样做将 TabBarController 的视图控制器设置为两个 ViewController：tabBarController.viewControllers = [nowPlayingNavigationController, topRatedNavigationController]

这工作正常。后来为了添加可定制性，我尝试使用容器视图创建一个滑出式菜单。

此时我无法将以编程方式创建的 Tab Bar Controller 嵌入到 ContainerViewController 右侧的大容器视图中。由于我无法弄清楚如何以编程方式执行此操作，因此我尝试在 main.storyboard 中创建一个 TabBarController 并为其提供 StoryboardID 并尝试将其设置为 AppDelegate.swift.

中的变量 TabBarController

var tabBarController = storyboard.instantiateViewControllerWithIdentifier("TabBarController") as! UITabBarController

稍后，当我尝试修改 TabBar 并将之前创建的 ViewController 分配给 TabBarController 时，它根本不起作用。

tabBarController.viewControllers = [nowPlayingNavigationController, topRatedNavigationController]
tabBarController.tabBar.barStyle = .Black
tabBarController.tabBar.tintColor = UIColor.orangeColor()

我不确定为什么这不起作用，请帮助我。

AppDelegate.Swift didFinishLaunchingWithOptions 函数供参考

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    // Override point for customization after application launch.

    //window = UIWindow(frame: UIScreen.mainScreen().bounds)

    let storyboard = UIStoryboard(name: "Main", bundle: nil)

    let nowPlayingNavigationController = storyboard.instantiateViewControllerWithIdentifier("FlicksNavigationController") as! UINavigationController
    let nowPlayingViewController = nowPlayingNavigationController.topViewController as! MoviesViewController
    nowPlayingViewController.endpoint = "now_playing"
    nowPlayingNavigationController.tabBarItem.title = "Now Playing"
    nowPlayingNavigationController.tabBarItem.image = UIImage(named: "popular")
    nowPlayingNavigationController.navigationBar.barStyle = .BlackTranslucent

    let topRatedNavigationController = storyboard.instantiateViewControllerWithIdentifier("FlicksNavigationController") as! UINavigationController
    let topRatedViewController = topRatedNavigationController.topViewController as! MoviesViewController
    topRatedViewController.endpoint = "top_rated"
    topRatedNavigationController.tabBarItem.title = "Top Rated"
    topRatedNavigationController.tabBarItem.image = UIImage(named: "topRated")

    topRatedNavigationController.navigationBar.barStyle = .BlackTranslucent



    var tabBarController = storyboard.instantiateViewControllerWithIdentifier("TabBarController") as! UITabBarController

    //tabBarController.viewControllers = [nowPlayingNavigationController, topRatedNavigationController]
    tabBarController.tabBar.barStyle = .Black
    tabBarController.tabBar.tintColor = UIColor.orangeColor()



    //let containerViewController = storyboard.instantiateViewControllerWithIdentifier("ContainerViewController") as! ContainerViewController
    //let mainContainerView = containerViewController.mainContainerView

    //window?.rootViewController = tabBarController
    //window?.makeKeyAndVisible()


    return true
}

Answer 1

我最初不知道如何解决这个问题，但有人帮助了我，现在我开始工作了。

不必在 AppDelegate.swift 中控制 TabBarController，它必须在 ContainerViewController.swift 中完成，并且应该在 prepareForSegue 方法中完成。

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    // Get the new view controller using segue.destinationViewController.
    // Pass the selected object to the new view controller.
    if segue.destinationViewController.isKindOfClass(UITabBarController) {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)

        let nowPlayingNavigationController = storyboard.instantiateViewControllerWithIdentifier("FlicksNavigationController") as! UINavigationController
        let nowPlayingViewController = nowPlayingNavigationController.topViewController as! MoviesViewController
        nowPlayingViewController.endpoint = "now_playing"
        nowPlayingNavigationController.tabBarItem.title = "Now Playing"
        nowPlayingNavigationController.tabBarItem.image = UIImage(named: "popular")
        nowPlayingNavigationController.navigationBar.barStyle = .BlackTranslucent

        let topRatedNavigationController = storyboard.instantiateViewControllerWithIdentifier("FlicksNavigationController") as! UINavigationController
        let topRatedViewController = topRatedNavigationController.topViewController as! MoviesViewController
        topRatedViewController.endpoint = "top_rated"
        topRatedNavigationController.tabBarItem.title = "Top Rated"
        topRatedNavigationController.tabBarItem.image = UIImage(named: "topRated")

        topRatedNavigationController.navigationBar.barStyle = .BlackTranslucent



        let tabVC = segue.destinationViewController as! UITabBarController

        tabVC.viewControllers = [nowPlayingNavigationController, topRatedNavigationController]
        tabVC.tabBar.barStyle = .Black
        tabVC.tabBar.tintColor = UIColor.orangeColor()

    }
}

我认为必须这样做，因为 TabBarController 在 StoryBoard 中实例化并包含在 ContainerViewController 内部的 containerView 中。因此，控制它的方法是在 prepareForSegue 方法中而不是在 AppDelegate.swift.

中

以编程方式将视图控制器分配给选项卡栏控制器

Programmatically assign view controller to tab bar controller

swift

uitabbarcontroller

appdelegate

uitabbaritem

uicontainerview