iphone - 枚举崩溃时，GyroUpdates和重新启动场景发生了变化(SpriteKit和Swift)

Question

我有一个Swift SpriteKit场景，但并非每次都发生，但我通过按菜单对重启游戏按钮进行了一些测试，然后反复快速连续重启直到崩溃。它还会从加载场景的其他点随机崩溃。我的估计是，该行崩溃的可能性约为30％

class AppDelegate: UIResponder, UIApplicationDelegate {

与以下错误:

2015-03-07 09:52:14.347 DDgame[1457:433285] * Terminating app due to uncaught exception 'NSGenericException', reason: '* Collection <__NSArrayM: 0x170051e50> was mutated while being enumerated.' *** First throw call stack: (0x18342259c 0x193b6c0e4 0x183421f50 0x187a57538 0x187a56c84 0x187a5661c 0x187a56510 0x10008f4c0 0x1000913b0 0x187a46bcc 0x187a43fd8 0x187a41038 0x187a6dfd8 0x100360a9c 0x187575280 0x187575118 0x1845718d0 0x1833c55e4 0x1833da200 0x1833da160 0x1833d80e0 0x1833050a4 0x18c49f5a4 0x187c36aa4 0x1000d1204 0x1000d1244 0x1941daa08) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)

我使用了一个catch all exception断点，发现它在陀螺仪更新的更新方法中崩溃。有没有人有更安全的方法来通过更新按钮使陀螺仪安全运行？

这是touchesBegan方法的摘录，我删除了位于其他按钮内的代码，只是不想在此处产生过多的绒毛:(不确定您是否需要这里的附加功能？)

            else if node.name == "replayButton" {

                    if let scene = GameScene.unarchiveFromFile("GameScene") as? GameScene {
                        NSNotificationCenter.defaultCenter().removeObserver(self, name: "pauseGame", object: nil)


                        let transition = SKTransition.revealWithDirection(SKTransitionDirection.Down, duration: 1.0)

                        scene.scaleMode = SKSceneScaleMode.AspectFill

                        self.view?.presentScene(scene, transition: transition)
            }

我发现它在更新方法中的陀螺仪更新上崩溃了:

override func update(currentTime: NSTimeInterval) {
    var timeSinceLast = currentTime - lastUpdateTimeInterval
    lastUpdateTimeInterval = currentTime

    if(!gameOver) {
        //check for gameover
        if (self.goldStash <= 0) {   
            gameOver = true
            gameIsPaused = true
            self.gameOverMethod()
        }


        //spawning logic
        spawnEngine()
        //gyro update
        if (self.motionManager.gyroData != nil) {
            self.updateGyroNodeWithData(self.childNodeWithName("GoldBack") as? SKSpriteNode, gyroIn: motionManager.gyroData)
            self.updateGyroNodeWithDataReverse(self.childNodeWithName("GoldFront") as? SKSpriteNode, gyroIn: motionManager.gyroData)
            self.updateGyroNode(self.childNodeWithName("CBack1") as? SKSpriteNode, gyroIn: motionManager.gyroData, minIn: cBack1position.x-10.0, maxIn: cBack1position.x+10.0, sensitivity: 0.8)
            self.updateGyroNode(self.childNodeWithName("CBack2") as? SKSpriteNode, gyroIn: motionManager.gyroData, minIn: cBack2position.x-10.0, maxIn: cBack2position.x+10.0, sensitivity: 0.8)
            self.updateGyroNode(self.childNodeWithName("CBack3") as? SKSpriteNode, gyroIn: motionManager.gyroData, minIn: cBack3position.x-10.0, maxIn: cBack3position.x+10.0, sensitivity: 0.8)
            self.updateGyroNode(self.childNodeWithName("CBack4") as? SKSpriteNode, gyroIn: motionManager.gyroData, minIn: cBack4position.x-10.0, maxIn: cBack4position.x+10.0, sensitivity: 0.8)
        } 
    }

    if timeSinceLast > 1 {
        timeSinceLast = kMinTimeInterval
    }
    updateWithTimeSinceLastUpdate(timeSinceLast)
}

func updateWithTimeSinceLastUpdate(timeSinceLast: NSTimeInterval) {
    for dwarf in dwarves {
        dwarf.updateWithTimeSinceLastUpdate(timeSinceLast)
    }

}

Answer 1

我解决了这个问题。就是在这段代码中:

self.childNodeWithName("GoldBack") as? SKSpriteNode

它继续枚举节点的场景，然后销毁场景。我尝试放入一个 bool(boolean) 值以防止在打开菜单时运行陀螺仪更新，但是由于某种原因它不断崩溃，该百分比显着下降，但是没有任何作用。

最好的解决方案是在init中创建节点的变量，然后对update方法中的节点运行陀螺仪更新。

var goldBack = SKSpriteNode?()

goldBack = self.childNodeWithName("GoldBack") as? SKSpriteNode

然后在更新方法中:

self.updateGyroNodeWithData(goldBack, gyroIn: motionManager.gyroData)

我以前对此一无所知，但实际上对我有帮助的另一件事是在Xcode中添加了“所有异常”断点。 (这是通过转到断点导航器，按左下角的+并添加异常断点来完成的)