Question

我有一个游戏场景，其中包含与歌曲内容同步发生的动画。我试图设置的其中一个动作与使用SKLabelNode显示的歌曲的歌词有关。我想要做的是根据LabelNode中是否有字符来切换两个动画（歌手停止“唱歌”并等待）。我在更新方法中有这个：

var singerActive = false
var lyricsLabel = SKLabelNode()

override func update(currentTime: CFTimeInterval) {
        /* Called before each frame is rendered */
        if lyricsLabel.text?.characters.count == 0{
            singerActive = false
        }else{
            singerActive = true
        }

        let sings = SKAction.runBlock { () -> Void in
            self.singer.runAction(SKAction.fadeAlphaTo(1, duration: 0.1))
            self.singerIdle.runAction(SKAction.fadeAlphaTo(0, duration: 0.1))
        }
        let singerInactive = SKAction.runBlock { () -> Void in
            self.singer.runAction(SKAction.fadeAlphaTo(0, duration: 0.1))
            self.singerIdle.runAction(SKAction.fadeAlphaTo(1, duration: 0.1))
        }

        var stopper = true
        if singerActive && stopper{
            stopper = false
            singer.runAction(sings)
        }

        if singerActive == false && stopper == false{

            stopper = true
            singer.runAction(singerInactive)
        }

    }

不幸的是，这似乎不起作用。活动歌手状态有效，但是当字符数== 0时，无效状态无法触发。我将“塞子”布尔放在那里，以确保不会像更新方法那样连续调用SKAction。我是Swift和SpriteKit的新手，所以任何帮助都会非常感激。

Answer 1

你的塞子代码打破了一切，你想做这样的事情：

    override func update(currentTime: CFTimeInterval) {
    /* Called before each frame is rendered */
    if lyricsLabel.text?.characters.count == 0{
        singerActive = false
    }else{
        singerActive = true
    }

    let sings = SKAction.runBlock { () -> Void in
        self.singer.runAction(SKAction.fadeAlphaTo(1, duration: 0.1))
        self.singerIdle.runAction(SKAction.fadeAlphaTo(0, duration: 0.1))
    }
    let singerInactive = SKAction.runBlock { () -> Void in
        self.singer.runAction(SKAction.fadeAlphaTo(0, duration: 0.1))
        self.singerIdle.runAction(SKAction.fadeAlphaTo(1, duration: 0.1))
    }

    if singerActive{
        singer.removeAllActions()
        singer.runAction(sings)
    }
    else{
        singer.removeAllActions()
        singer.runAction(singerInactive)
    }

}

但这也很糟糕，因为这意味着您始终对每次更新都运行操作。您可能希望重新编写代码，这样就不会发生。

所以你需要做这样的事情：

    override func update(currentTime: CFTimeInterval) {
    /* Called before each frame is rendered */
    if lyricsLabel.text?.characters.count == 0{
        singerActive = false
    }else{
        singerActive = true
    }

    let sings = SKAction.runBlock { () -> Void in
        self.singer.runAction(SKAction.fadeAlphaTo(1, duration: 0.1))
        self.singerIdle.runAction(SKAction.fadeAlphaTo(0, duration: 0.1))
    }
    let singerInactive = SKAction.runBlock { () -> Void in
        self.singer.runAction(SKAction.fadeAlphaTo(0, duration: 0.1))
        self.singerIdle.runAction(SKAction.fadeAlphaTo(1, duration: 0.1))
    }

    if singerActive && singerIdle.alpha = 1{
        singer.removeAllActions()
        singerIdle.alpha = 0.99;
        singer.runAction(sings)
    }
    else if !singerActive && singer.alpha = 1{
        singer.removeAllActions()
        singer.alpha = 0.99;
        singer.runAction(singerInactive)
    }

}

现在我们只在我们的alpha状态为1时调用它

根据SKLabel节点文本的字符数运行SKAction

1 个答案: