SKView！呈现时发现为零

Question

class MyClass: UIViewController {

var playerViewController = AVPlayerViewController()
var playerView = AVPlayer()
var playerTimer = NSTimer()


override func viewDidAppear(animated:Bool) {
    super.viewDidAppear(true)
    presentViewController(GameViewController1(), animated: false, completion: nil)
    let fileURL = NSURL(fileURLWithPath: "SomeFile.mp4")

    playerView = AVPlayer(URL: fileURL)

    playerViewController.player = playerView

    self.presentViewController(playerViewController, animated: false){
        self.playerViewController.showsPlaybackControls = false
        self.playerViewController.player?.play()
        self.playerTimer = NSTimer.scheduledTimerWithTimeInterval(4.2, target: self, selector:Selector("stopAfter4seconds:"), userInfo: nil, repeats: false)
    }
}
func stopAfter4seconds(timer: NSTimer){
    playerViewController.player = nil
    playerViewController.removeFromParentViewController()
    playerTimer.invalidate()
    playerViewController.presentViewController(GameViewController1(), animated: false, completion: nil)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()


}

}

我在 'MyClass' 上播放视频后（Class 以上）

然后我删除视图并显示我的 GameContollerView1，它有 GameScene。
（下图Class）

class GameViewController1: UIViewController, ADBannerViewDelegate {


@IBOutlet var skView: SKView!

override func viewDidLoad() {
    super.viewDidLoad()


    if skView.scene == nil {
        let scene = GameScene(size: skView.bounds.size)
        skView.presentScene(scene)
    }
}

override func shouldAutorotate() -> Bool {
    return true
}

override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
    if UIDevice.currentDevice().userInterfaceIdiom == .Phone {
        return UIInterfaceOrientationMask.AllButUpsideDown
    } else {
        return UIInterfaceOrientationMask.All
    }
}

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

override func prefersStatusBarHidden() -> Bool {
    return true
}

}

我最初的问题是当我显示 class 'GameViewController1' 时出现错误：

 fatal error: unexpectedly found nil while unwrapping an Optional value
  (lldb)

在这一行：

if skView.scene == nil {

所以它告诉我我的 SKView！是 nil，正如您从我的 if 语句中看到的那样，这正是我一直在寻找的东西。

最奇怪的是，当我跳过 'MyClass' 并首先将 StoryBoard 入口点指向 GameViewContoller1 时，所有代码都能正确播放。

AVPlayer() 是否与此有关？从逻辑上讲，我的代码应该可以工作，但由于某些未知原因……事实并非如此。任何帮助将不胜感激。

Answer 1

OP 答案：最后回到 AppDelegate 并从那里调用 GameViewController1 class。花了一点时间才弄明白，但这是为我完成的整体代码：

let gameScene = UIStoryboard(name: "Main", bundle:nil).instantiateViewControllerWithIdentifier("GameViewController1") as UIViewController
    let appDelegate = (UIApplication.sharedApplication().delegate as! AppDelegate)
    appDelegate.window?.rootViewController = gameScene

我将此代码输入 ViewDidDisappear 以使我的 AVplayer 消失并加载新视图 :)..你不知道这花了我多长时间。

提示：确保将其放入某种 ViewDidLoad 或其中一种视图方法中，否则会出现错误 "Expected Declaration"

SKView！呈现时发现为零

SKView! found nil when presented

xcode

view

ios

skview

swift