ios - 将 UIView 转换为 SKView 时的程序集崩溃报告

Question

我正在用 SpriteKit 制作一个简单的游戏，我正在尝试使用 UIKit 制作一个主菜单。我为主菜单创建了一个 View Controller ，为游戏创建了一个单独的 View Controller 。每当按下播放按钮时，它都会切换到游戏 View Controller ，然后在其中呈现第一个场景。但是，每当它似乎试图将游戏 View Controller 的 UIView 转换到 SKView 以能够呈现场景时，都会出现故障，并且崩溃报告是程序集，我不知道如何调试。我相信它会两次实例化游戏 View Controller ，因为当我在 viewWillLayoutSubviews() 方法中放置一个 println() 时，它会打印两次。另一篇关于此的帖子说，在转换期间类型已经是 SKView，导致它失败，在这种情况下，这可能意味着当它触发两次时，它转换一次，然后尝试再次转换并失败。提前致谢!

这是快速代码

import UIKit
import SpriteKit

class MenuViewController: UIViewController {
    let background = UIImageView(image: UIImage(named: "background.png"))
    let titleImg = UIImageView(image: UIImage(named: "title.png"))

    override func viewDidLoad() {
        background.frame = self.view.frame
        titleImg.frame = CGRectMake(0, 0, self.view.frame.width, 100)
        self.view.addSubview(background)
        self.view.addSubview(titleImg)
        let bp = ButtonPositions(controller: self)
        let play = button(bp.playY, named: "playButton.png")
        let leader = button(bp.leaderY, named: "leaderButton.png")
        let rate = button(bp.rateY, named: "rateButton.png")
        play.addTarget(self, action: "playPressed", forControlEvents: UIControlEvents.TouchDown)
        leader.addTarget(self, action: "leaderPressed", forControlEvents: UIControlEvents.TouchDown)
        rate.addTarget(self, action: "ratePressed", forControlEvents: UIControlEvents.TouchDown)
        self.view.addSubview(rate)
        self.view.addSubview(leader)
        self.view.addSubview(play)
     }

    func button(y:CGFloat, named name:String!) -> UIButton {
        let bp = ButtonPositions(controller: self)
        let img = UIImage(named: name)
        let b = UIButton(frame: CGRectMake(bp.x, y, self.view.frame.width / 1.5, img.size.height))
        b.setImage(img, forState: UIControlState.Normal)
        return b
    }

    func playPressed() {
        println("playPressed") //only prints once
       changeVC()
    }

    func changeVC() {
        self.presentViewController(GameViewController(), animated: true, completion: nil) //maybe initializing the GameViewController twice for some reason?
    }

    func leaderPressed() {

    }

    func ratePressed() {

    }

    func center() -> CGPoint {
        return CGPoint(x: CGRectGetMidX(self.view.frame), y: CGRectGetMidY(self.view.frame))
    }

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


class GameViewController: UIViewController {
    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()
        //prepareGame() 
        println("test") //this prints twice, even through the button press event is only triggered once
    }

    func prepareGame() {
            let skView = self.view as SKView //crashes here when called
            let scene = GameScene(size: self.view.bounds.size)
            skView.showsFPS = true
            skView.showsNodeCount = true
            skView.ignoresSiblingOrder = true
            scene.scaleMode = .AspectFill
            skView.presentScene(scene)

    }

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

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

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

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

Answer 1

我遇到了同样的问题。我使用 iOS 的默认 Swift Game 项目创建了我的项目，该项目默认为 SceneKit 创建了项目，因为我想使用 SpriteKit 并尝试将我的新场景转换到 SKView，它在我试图转换的那一行产生了 EXC_BAD_ACCESS。为了解决我的问题，我不得不将主 Storyboard中的类更改为 SKView，因为它默认为 SCNView。

我遵循的修复步骤:

1. 选择主 Storyboard(在我的例子中是 Main.storyboard)
2. 从 View Controller 下的层次结构中选择 View
3. 选择身份检查器选项卡(右侧的实用程序面板)
4. 在自定义类部分下，将类从 SCNView 更改为 SKView

执行此操作后，问题就消失了。