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菜鸟教程小白 发表于 2022-12-13 11:37:58

iOS - 更改 Root View Controller 后获取黑色 View

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

<p>我的 AppDelegate.swift</p>

<pre><code>func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: ?) -&gt; Bool {
      // Override point for customization after application launch.
      self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
      let storyBoard = UIStoryboard(name: &#34;Main&#34;, bundle: NSBundle.mainBundle())
      let vc1 = storyBoard.instantiateViewControllerWithIdentifier(&#34;VC1&#34;) as! VC1
      let nc = UINavigationController(rootViewController: vc1)
      self.window?.rootViewController = nc
      self.window?.makeKeyAndVisible()

      return true
    }
</code></pre>

<p>第一个 ViewController(VC1.swift)</p>

<pre><code>class VC1: UIViewController {

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

    deinit {
      print(&#34;Deinit of VC1&#34;)
    }

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

      let storyBoard = UIStoryboard(name: &#34;Main&#34;, bundle: NSBundle.mainBundle())
      let vc2 = storyBoard.instantiateViewControllerWithIdentifier(&#34;VC2&#34;) as! VC2
      let nc = UINavigationController(rootViewController: vc2)

      rootNavigationControl.presentViewController(nc, animated: true) { () -&gt; Void in
            // ------- Becomes black screen here ----------
            rootNavigationControl.viewControllers =
      }
    }

    override func didReceiveMemoryWarning() {
      super.didReceiveMemoryWarning()
    }
}
</code></pre>

<p>第二 ViewController(VC2.swift)</p>

<pre><code>class VC2: UIViewController {

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

    deinit {
      print(&#34;Deinit of VC2&#34;)
    }

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

      let storyBoard = UIStoryboard(name: &#34;Main&#34;, bundle: NSBundle.mainBundle())
      let vc1 = storyBoard.instantiateViewControllerWithIdentifier(&#34;VC1&#34;) as! VC1
      let nc = UINavigationController(rootViewController: vc1)

      rootNavigationControl.presentViewController(nc, animated: true) { () -&gt; Void in
            rootNavigationControl.viewControllers =
      }
    }

    override func didReceiveMemoryWarning() {
      super.didReceiveMemoryWarning()
    }
}
</code></pre>

<p>请有人帮我找出问题所在。
提前感谢所有帮助。</p></p>
                                    <br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
                                            <p><p>我会这样做:</p>

<p>AppDelegate.swift</p>

<pre><code>func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: ?) -&gt; Bool
{
    let storyBoard = UIStoryboard(name: &#34;Main&#34;, bundle: NSBundle.mainBundle())
    let vc1 = storyBoard.instantiateViewControllerWithIdentifier(&#34;VC1&#34;)
    let nc = UINavigationController(rootViewController: vc1)
    self.window?.rootViewController = nc

    return true
}
</code></pre>

<p>VC1.swift</p>

<pre><code>class VC1: UIViewController
{

    @IBAction func btnTapped(sender: AnyObject)
    {
      if let vc2 = self.storyboard?.instantiateViewControllerWithIdentifier(&#34;VC2&#34;)
      {
            self.navigationController?.pushViewController(vc2, animated: true)
      }
    }
}
</code></pre>

<p>VC2.swift</p>

<pre><code>class VC2: UIViewController
{

    @IBAction func btnTapped(sender: AnyObject)
    {
      if let vc1 = self.storyboard?.instantiateViewControllerWithIdentifier(&#34;VC1&#34;)
      {
            self.navigationController?.pushViewController(vc1, animated: true)
      }
    }
}
</code></pre></p>
                                   
                                                <p style="font-size: 20px;">关于iOS - 更改 Root ViewController 后获取黑色 View ，我们在Stack Overflow上找到一个类似的问题：
                                                        <a href="https://stackoverflow.com/questions/33400696/" rel="noreferrer noopener nofollow" style="color: red;">
                                                                https://stackoverflow.com/questions/33400696/
                                                        </a>
                                                </p>
                                       

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