iOS - 更改 Root View Controller 后获取黑色 View

我试图在按钮点击时将 Root View Controller 从 ViewController1 更改为 ViewController2，反之亦然。问题是我将第二个 View Controller 设置为 Root View Controller 后出现黑屏。我附上我的代码。

我的 AppDelegate.swift

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.
        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
        let storyBoard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
        let vc1 = storyBoard.instantiateViewControllerWithIdentifier("VC1") as! VC1
        let nc = UINavigationController(rootViewController: vc1)
        self.window?.rootViewController = nc
        self.window?.makeKeyAndVisible()

        return true
    }

第一个 View Controller (VC1.swift)

class VC1: UIViewController {

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

    deinit {
        print("Deinit of VC1")
    }

    @IBAction func btnTapped(sender: AnyObject) {
        let window = UIApplication.sharedApplication().windows[0]
        let rootNavigationControl = window.rootViewController as! UINavigationController

        let storyBoard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
        let vc2 = storyBoard.instantiateViewControllerWithIdentifier("VC2") as! VC2
        let nc = UINavigationController(rootViewController: vc2)

        rootNavigationControl.presentViewController(nc, animated: true) { () -> Void in
            // ------- Becomes black screen here ----------
            rootNavigationControl.viewControllers = [vc2]
        }
    }

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

第二 View Controller (VC2.swift)

class VC2: UIViewController {

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

    deinit {
        print("Deinit of VC2")
    }

    @IBAction func btnTapped(sender: AnyObject) {
        let window = UIApplication.sharedApplication().windows[0]
        let rootNavigationControl = window.rootViewController as! UINavigationController

        let storyBoard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
        let vc1 = storyBoard.instantiateViewControllerWithIdentifier("VC1") as! VC1
        let nc = UINavigationController(rootViewController: vc1)

        rootNavigationControl.presentViewController(nc, animated: true) { () -> Void in
            rootNavigationControl.viewControllers = [vc1]
        }
    }

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

请有人帮我找出问题所在。 提前感谢所有帮助。

---

Best Answer-推荐答案

我会这样做:

AppDelegate.swift

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool
{
    let storyBoard = UIStoryboard(name: "Main", bundle: NSBundle.mainBundle())
    let vc1 = storyBoard.instantiateViewControllerWithIdentifier("VC1")
    let nc = UINavigationController(rootViewController: vc1)
    self.window?.rootViewController = nc

    return true
}

VC1.swift

class VC1: UIViewController 
{

    @IBAction func btnTapped(sender: AnyObject)
    {
        if let vc2 = self.storyboard?.instantiateViewControllerWithIdentifier("VC2")
        {
            self.navigationController?.pushViewController(vc2, animated: true)
        }
    }
}

VC2.swift

class VC2: UIViewController 
{

    @IBAction func btnTapped(sender: AnyObject)
    {
        if let vc1 = self.storyboard?.instantiateViewControllerWithIdentifier("VC1")
        {
            self.navigationController?.pushViewController(vc1, animated: true)
        }
    }
}

关于iOS - 更改 Root View Controller 后获取黑色 View ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33400696/