将SKNodes添加到SKScene减慢动画

I have a SKScene, in which I have a timer callback (not run loop) that at each time step updates the scene by adding and/or removing SKNodes. The idea is to animate the nodes travelling down in a straight line. Below is the code in my callback.

我有一个SKScene，我有一个定时器回调（不是运行循环），在每个时间步骤通过添加和/或删除SKNodes更新场景。这个想法是为了使直线向下行进的节点动画化。下面是我的回调中的代码。

    // 1. Add new nodes

    let newSprite = SKSpriteNode(imageNamed: "file")

    newSprite.position = (pos, pos)
    spriteList.append((sprite: newSprite, position: 0))
    scene.addChild(newSprite)

    var removeList = [Int]()

    let action = SKAction.move(to: (new, pos), duration: 5.0)
    newSprite.run(action)

    // 2. Update node positions
    for (i,_) in spriteList.enumerated() {
        spriteList[i].position += 1
        if spriteList[i].position > gridLength {
            removeList.append(i)
        }
    }

    // 3. Remove old nodes
    for i in removeList {
        spriteList[i].sprite.removeFromParent()
        spriteList.remove(at: i)
    }

At the moment, each time this callback runs, the animation stutters. When the callback stops and I have no more nodes to add, the rest of the nodes in the scene animate smoothly down. Any suggestions how I can fix this? Is the problem adding the nodes, running the logic, or something else entirely?

目前，每次回调运行时，动画都会断断续续。当回调停止并且我没有更多节点要添加时，场景中的其余节点将平滑地向下动画。有什么建议我可以解决这个问题吗？是添加节点，运行逻辑还是完全不同的问题？

1 个解决方案

#1

I have a SKScene, in which I have a timer callback (not run loop)

我有一个SKScene，我有一个计时器回调（不是运行循环）

Don't do it

You should never use timers with SpriteKit, always stick to the run loop instead.

你永远不应该使用SpriteKit的计时器，而是始终坚持运行循环。

Actions

If you want to repeat a block of code every n seconds just use actions

如果您想每n秒重复一段代码，只需使用操作即可

class Scene: SKScene {
    override func didMove(to view: SKView) {
        super.didMove(to: view)

        let action = SKAction.run { [unowned self] in
            // <--- put the codwe you want to repeat every 2 seconds here
        }

        let wait = SKAction.wait(forDuration: 2)
        let sequence = SKAction.sequence([action, wait])
        let repeatForever = SKAction.repeatForever(sequence)
        run(repeatForever)
    }
}