转换到新场景时,SpriteKit会收到有关UIElements的错误

Question

你好我正在开发一个SpriteKitSwift游戏,现在只有两个场景,一个加载场景和游戏场景.游戏场景到达数据库以在呈现之前获取信息.游戏场景中的一切都很棒.当我首先进入装载场景而不是直接进入游戏场景时,我遇到了问题.通过回调,我告诉加载场景,一旦完成数据库操作就会呈现游戏场景.然而,当我尝试呈现时,我得到了10个以上的大错误:

2015-11-12 09:48:33.880 SpaceAcademy [2373:764586]此应用程序正在从后台线程修改autolayout引擎,这可能导致引擎损坏和奇怪的崩溃.这将在将来的版本中导致异常.(后跟一堆随机信息)

现在通过一些测试我发现它是我的UIElement按钮,滑块和标签导致了这一点.但是我把它们移到了didMoveToView函数中,所以我很困惑为什么它们仍然会抛出错误,因为它们在"后台线程"中.

还奇怪的是,这些都不是致命的错误.我的控制台刚刚爆炸,并在UIElements延迟十秒后显示出来.其他奇怪的是,如果我点击我知道该按钮应该是的位置仍然会调用该函数,就像按钮实际上在那里一样.

我非常感谢摆脱控制台爆炸的解决方案,但更重要的是摆脱了出现的十秒延迟UI Elements,谢谢!

代码设置场景

let skView = view as! SKView
    skView.showsFPS = false
    skView.showsNodeCount = false
    skView.ignoresSiblingOrder = true

    let scene = GameScene(size: view.bounds.size)
    scene.scaleMode = SKSceneScaleMode.ResizeFill


    let loading = LoadingScene(size: view.bounds.size, newScene: scene)
    skView.presentScene(loading, transition: SKTransition.crossFadeWithDuration(1))

    scene.setEverythingUp(loading)

加载场景:

import Foundation
import SpriteKit

class LoadingScene:SKScene{
    var newScene:SKScene!
    var oldCount = 0
    var loadCount = 0{
    didSet{
        print(loadCount)
        if loadCount == 0{
            if oldCount == 1{
                self.view?.presentScene(newScene)
            }
        }
        oldCount = loadCount
    }
}

init(size: CGSize, newScene:SKScene) {
    self.newScene = newScene
    super.init(size: size)

}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

override func didMoveToView(view: SKView) {
    self.backgroundColor = UIColor.blackColor()
    let imageArray = [
        SKTexture(imageNamed: "Loader/Loader1.png"),
        SKTexture(imageNamed: "Loader/Loader2.png"),
        SKTexture(imageNamed: "Loader/Loader3.png")
    ]

    let loader = SKSpriteNode(texture: imageArray[0])
    let animation = SKAction.animateWithTextures(imageArray, timePerFrame: 0.33)
    loader.runAction(SKAction.scaleBy(0.25, duration: 0))
    loader.zPosition = 100
    loader.runAction(SKAction.repeatActionForever(animation))
    loader.position = CGPointMake(self.size.width/2, self.size.height/2)
    self.addChild(loader)
}

func start(){
    self.loadCount = self.loadCount + 1
}

func end(){
    self.loadCount = self.loadCount - 1
}

}

来自GameScene的代码:

func setEverythingUp(myLoadingScene: LoadingScene){

    let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()

    var Id = 0
    if let tempID = defaults.objectForKey("UserId") as? Int {
       Id = tempID
    }else{
        print("newUser")
        defaults.setObject(0, forKey: "UserId")
        defaults.synchronize()
    }

    self.mySettings = Settings(UserId: Id)
    self.myURLRequests = URLRequests(thesettings: self.mySettings)

    ///////////call back system here, start() increments number of tasks waiting to finish, end() means a task is finished

    myLoadingScene.start()
    myURLRequests.getFleet(self, UserId: self.mySettings.UserId, enemy: false){ () -> () in
        myLoadingScene.end()
    }

    myLoadingScene.start()
    myURLRequests.getFleet(self, UserId: self.mySettings.UserId, enemy: true){ () -> () in
        myLoadingScene.end()
    }



    self.backgroundColor = SKColor.blackColor()
    self.physicsWorld.contactDelegate = self
    self.physicsWorld.gravity = CGVector(dx: 0, dy: 0)
    addStars()


    self.anchorPoint = CGPoint(x:self.size.width/2, y:self.size.height/2)
    self.myCamera.position = CGPointMake(200, 0)
    self.addChild(self.myCamera)
    self.camera = self.myCamera
    self.myAnchor.position = self.myCamera.position
}



override func didMoveToView(view: SKView) {
    print("in view")

    let pinch = UIPinchGestureRecognizer(target: self, action: Selector("PinchScale:"))
    let tap = UITapGestureRecognizer(target: self, action: Selector("Tap:"))
    let pan = UIPanGestureRecognizer(target: self, action: Selector("DragMove:"))

    self.view?.addGestureRecognizer(pinch)
    self.view?.addGestureRecognizer(tap)
    self.view?.addGestureRecognizer(pan)


    let fireButton = UIButton(type: .System)
    fireButton.setTitle("Fire!", forState: UIControlState.Normal)
    fireButton.titleLabel!.font = UIFont(name: "TrebuchetMS", size: 70)
    fireButton.sizeToFit()
    fireButton.frame = CGRect(x: self.size.width*0.5 - 80, y: 20, width: self.size.width*0.3, height: 30)
    fireButton.addTarget(self, action: Selector("FireButtonClicked"), forControlEvents: UIControlEvents.TouchUpInside)
    self.view?.addSubview(fireButton)

    let alternateControls = false

    let AngleLabel = UILabel()
    AngleLabel.text = "Angle"
    AngleLabel.font = UIFont(name: "TrebuchetMS", size: 30)
    AngleLabel.textColor = UIColor.blueColor()


    let AngleSlider = UISlider()
    AngleSlider.addTarget(self, action: Selector("AngleSlided:"), forControlEvents: UIControlEvents.ValueChanged)
    AngleSlider.maximumValue = 90
    AngleSlider.minimumValue = -90
    AngleSlider.value = 0
    AngleSlider.continuous = true



    let PowerLabel = UILabel()
    PowerLabel.text = "Power"
    PowerLabel.font = UIFont(name: "TrebuchetMS", size: 30)
    PowerLabel.textColor = UIColor.blueColor()


    let PowerSlider = UISlider()
    PowerSlider.addTarget(self, action: Selector("PowerSlided:"), forControlEvents: UIControlEvents.ValueChanged)
    PowerSlider.maximumValue = 0.99
    PowerSlider.minimumValue = 0.1
    PowerSlider.value = 0.5
    PowerSlider.continuous = true


    if alternateControls{
        AngleLabel.frame = CGRect(x: self.size.width*0.05, y: 10, width: self.size.width*0.3, height: 60)
        AngleSlider.frame = CGRect(x: self.size.width * -0.05, y: self.size.height*0.55, width: self.size.height*0.7, height: 30)
        AngleSlider.transform = CGAffineTransformMakeRotation(CGFloat(M_PI) * 1.5)
        PowerLabel.frame = CGRect(x: self.size.width*0.7, y: 10, width: self.size.width*0.3, height: 60)
        PowerSlider.frame = CGRect(x: self.size.width * 0.65, y: self.size.height*0.55, width: self.size.height*0.7, height: 30)
        PowerSlider.transform = CGAffineTransformMakeRotation(CGFloat(M_PI) * 1.5)
    }else{
        AngleLabel.frame = CGRect(x: self.size.width*0.21, y: self.size.height-80, width: self.size.width*0.3, height: 60)
        AngleSlider.frame = CGRect(x: self.size.width * 0.025, y: self.size.height-30, width: self.size.width*0.45, height: 30)
        PowerLabel.frame = CGRect(x: self.size.width*0.71, y: self.size.height-80, width: self.size.width*0.3, height: 60)
        PowerSlider.frame = CGRect(x: self.size.width * 0.525, y: self.size.height-30, width: self.size.width*0.45, height: 30)
    }

    self.view?.addSubview(AngleLabel)
    self.view?.addSubview(AngleSlider)
    self.view?.addSubview(PowerLabel)
    self.view?.addSubview(PowerSlider)

}

Answer 1

你这样做:

myURLRequests.getFleet(self, UserId: self.mySettings.UserId, enemy: false){ () -> () in
    myLoadingScene.end()
}

myLoadingScene.end()一旦URL请求完成,可能会调用后台线程.endsets loadCount,有一个启动新视图的setter,self.view?.presentScene(newScene)

这是需要在主线程上运行的最后一块.

假设你有一个方便的函数来在主线程上运行一些东西:

func on_main_async (closure:()->()) {
    dispatch_async(dispatch_get_main_queue()) {
        closure()
    }
}

然后您可以将场景演示代码更改为

on_main_async() { self.view?.presentScene(newScene) }

应该做的伎俩.