“点击恢复”暂停文本 SpriteKit

Question

我知道 SpriteKit 已经在应用程序进入非活动状态时处理暂停游戏，但我想做的是在应用程序重新进入活动状态时添加一个 SKLabelNode “点击恢复”。现在它正在正确调用我的函数并暂停游戏，但没有显示文本。

AppDelegate.swift

func applicationWillResignActive(application: UIApplication) {
    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
    // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
    println("applicationWillResignActive")
    NSNotificationCenter.defaultCenter().postNotificationName("PauseGameScene", object: self)
    NSNotificationCenter.defaultCenter().postNotificationName("ShowPauseText", object: self)
    ...
}

GameScene.swift

class GameScene: SKScene, SKPhysicsContactDelegate {
    ...
    let tapToResume = SKLabelNode(fontNamed: "Noteworthy")
    ...
    override func didMoveToView(view: SKView) {
        ...
        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("pauseGameScene"), name: "PauseGameScene", object: nil)
        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("showPauseText"), name: "ShowPauseText", object: nil)

        tapToResume.text = "tap to resume"
        tapToResume.position = CGPoint(x:CGRectGetMidX(self.frame), y:CGRectGetMidY(self.frame))
        tapToResume.fontSize = 55
        tapToResume.hidden = true
        self.addChild(tapToResume)
        ...
    }

    func pauseGameScene() {
        println("pause game")
        self.view?.paused = true
    }

    func showPauseText() {
        if self.view?.paused == true {
            tapToResume.hidden = false
            println("show text")
        }
    }

    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
        ...
        if self.paused {
            self.view?.paused = false
            if tapToResume.hidden == false {
                tapToResume.hidden = true
            }
        }
    }
    ...
}

编辑：

下面是我的终端输出的屏幕截图，其中包含我对上述代码的最新编辑：

Answer 1

所以我在这里“破解”了我的解决方案。感谢ABakerSmith 和设置self.speed = 0.0 的建议，操作被暂停，我的标签会出现，但physicsWorld 仍然处于活动状态。所以我的解决方案是设置self.speed = 0.0 和self.physicsWorld.speed = 0.0。当应用程序从非活动状态返回时，我只需重置self.speed = 1.0 和self.physicsWorld.speed = 1.0。我确信还有其他解决方案可以解决这个难题，但由于 SpriteKit 已经处理了中断，我真正需要做的就是暂停动作和物理。

GameScene.swift

class GameScene: SKScene, SKPhysicsContactDelegate {
    let tapToResume = SKLabelNode(fontNamed: "Noteworthy")
    ...

    override func didMoveToView(view: SKView) {
        ...
        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("pauseGameScene"), name: "PauseGameScene", object: nil)
        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("showPauseText"), name: "ShowPauseText", object: nil)
    }

    func pauseGameScene() {
        self.physicsWorld.speed = 0.0
        self.speed = 0.0
    }

    func showPauseText() {
        if self.physicsWorld.speed == 0.0 {
        tapToResume.hidden = false
        }
    }

    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
        ...
        if self.physicsWorld.speed == 0.0 {
            self.physicsWorld.speed = 1.0
            self.speed = 1.0
            if tapToResume.hidden == false {
                tapToResume.hidden = true
            }
        }
    }

    ...
}

AppDelegate.swift

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    func applicationWillResignActive(application: UIApplication) {
    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
    // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
    NSNotificationCenter.defaultCenter().postNotificationName("PauseGameScene", object: self)
    NSNotificationCenter.defaultCenter().postNotificationName("ShowPauseText", object: self)
    }
    ...
}

Answer 2

我相信你的问题是设置self.view?.paused = true，正如@Steve 在评论和@Linus G. 在他的回答中指出的那样。因此，当您尝试取消隐藏标签时，没有任何反应，因为视图已暂停。

我尝试使用self.paused 来暂停SKScene。这解决了显示标签的问题，但实际上并没有暂停场景。这可能是由于：从 iOS8 开始，SpriteKit 在进入后台时会自动暂停您的游戏，并在进入前台时取消暂停游戏。因此，尝试设置self.paused = true，使用applicationWillResignActive，没有任何效果，因为它在进入前台时没有暂停。

要解决这个问题，您可以观察UIApplicationWillResignActiveNotification。然后当应用程序要退出活动时，您设置self.speed = 0，这与暂停SKScene 的效果相同。这将显示标签并根据需要暂停场景。

例如：

class GameScene: SKScene {
    let tapToResume = SKLabelNode(fontNamed: "Noteworthy")

    override func didMoveToView(view: SKView) {
        NSNotificationCenter.defaultCenter().addObserver(self, 
                             selector: Selector("pauseScene"), 
                             name: UIApplicationWillResignActiveNotification, 
                             object: nil)

        tapToResume.text = "tap to resume"
        tapToResume.position = CGPoint(x: frame.midX, y: frame.midY)
        tapToResume.fontSize = 55
        tapToResume.hidden = true
        self.addChild(tapToResume)
}

func pauseScene() {
    self.speed = 0.0
    tapToResume.hidden = false
}

override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
    // Check the label was pressed here.
    if labelWasPressed {
        self.speed = 1.0
        tapToResume.hidden = true
    }
}

Answer 3

我想我有问题。您应该先致电pauseGameScene()。那么view?.paused 就是true。 那么您可以拨打showPauseText()。

希望有帮助:)