以编程方式将视图控制器分配给选项卡栏控制器 [英] Programmatically assign view controller to tab bar controller

问题描述

我是新手，我正在尝试使用Apiary的TMDB创建电影数据库应用程序.

I am fairly new to swift and am trying to create a movie database application using TMDB from Apiary.

我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检索的数据.例如，"now_playing"键获取当前播放列表，而"top_rated"键获取电影评分最高的列表.最初执行此操作时，我在AppDelegate.swift中创建了标签栏控制器，并通过使用stantiateViewControllerWithIdentifier方法从情节提要中以编程方式将其添加到视图控制器中.最后，我通过执行以下操作将TabBarController的视图控制器设置为两个ViewController: tabBarController.viewControllers = [nowPlayingNavigationController，topRatedNavigationController]

I have created the layout of the view controllers for one category. However, I am planning to have multiple categories, the but only difference between them is the data I retrieve from the API. For example "now_playing" key gets the now playing list and the "top_rated" key gets the top rated list of movies. When I was initially doing this I created the tab bar controller in AppDelegate.swift and added the ViewControllers to it by getting them programmatically from the storyboard with the method instantiateViewControllerWithIdentifier. Then finally the I set the TabBarController's view controllers to the two ViewControllers by doing this: tabBarController.viewControllers = [nowPlayingNavigationController, topRatedNavigationController]

这很好.后来为了增加可定制性，我尝试使用容器视图创建一个滑出菜单.

This was working fine. Later to add customizability I tried creating a slide out menu using container views.

这时，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并为其提供一个StoryboardID，然后尝试将其设置为AppDelegate.swift中的变量TabBarController.

At this point I was unable to embed the programmatically created Tab Bar Controller into the large container view on the right side of the ContainerViewController. Since I could not figure out how to programmatically do this, I attempted to create a TabBarController in main.storyboard and gave it a StoryboardID and tried setting it to a variable TabBarController in AppDelegate.swift.

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

后来，当我尝试修改TabBar并将先前创建的ViewController分配给TabBarController时，它根本不起作用.

later when I try to modify the TabBar and assign the previously created ViewControllers to the TabBarController it simply does not work.

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

我不确定为什么这行不通，请帮帮我.

I am not sure why this isn't working please help me out.

AppDelegate.Swift didFinishLaunchingWithOptions函数以供参考

AppDelegate.Swift didFinishLaunchingWithOptions function for reference

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
}

推荐答案

我最初不知道如何解决此问题，但有人帮助了我，现在我开始解决了.

I initially had no idea of how to fix this problem but someone helped me out and now I got it working.

与其在AppDelegate.swift中控制TabBarController，不如在ContainerViewController.swift中完成它，而应在prepareForSegue方法中完成.

Instead of controlling the TabBarController in the AppDelegate.swift it has to be done in ContainerViewController.swift and it should be done in the prepareForSegue method.

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()

    }
}

我相信必须这样做，因为TabBarController是在StoryBoard中实例化的，并且包含在ContainerViewController内部的containerView中.因此，控制它的方法是在prepareForSegue方法内部，而不是在AppDelegate.swift中.

I believe this has to be done since the TabBarController is instantiated in StoryBoard and is contained in a containerView that is inside of the ContainerViewController. So, the way to control it would be inside the prepareForSegue method rather than in AppDelegate.swift.

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