xcode - 当玩家移动时 SKCameraNode 滞后

Question

我目前正在尝试让我的相机在玩家移动时跟随我的玩家“球体”。我已将相机的位置设置为在球体移动时移动到球体的 x 位置，但是由于某种原因，当球体快速移动时，SKCameraNode 会出现故障和卡顿，就好像它试图 catch 节点的位置一样。我读到这是因为物理在实际 update() 之后运行，但我不知道如何解决该问题。有什么办法可以解决这个问题吗？

注意:我不希望相机始终以“球体”为中心，而是在跟随球体时稍微延迟，以赋予其自由移动的感觉。 (如果这是有道理的话)

    import SpriteKit

    class GameScene: SKScene {

    var orb = SKSpriteNode()
    var Touch: UITouch?
    let theCamera: SKCameraNode = SKCameraNode()

    override func didMoveToView(view: SKView) {

        let orbTexture1 = SKTexture(imageNamed:"orb.png")

        orb = SKSpriteNode(texture: orbTexture1)
        orb.name = "Orb"
        orb.position = CGPointMake(300, 95)
        self.addChild(orb)

        theCamera.position = CGPointMake(300, 0)
        theCamera.name = "Camera"
        self.addChild(theCamera)
        self.camera = theCamera

    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        for touch in touches {
            if nodeAtPoint(touch.locationInNode(self)).name == "Orb" {
                Touch = touch as UITouch
            }
        }
    }

    override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
        for touch in touches {
            if Touch != nil {
                if touch as UITouch == Touch! {
                    let location = touch.locationInNode(self)
                        orb.position = location
                }
            }
        }
    }


override func update(currentTime: CFTimeInterval) {
    /* Called before each frame is rendered */

    let action = SKAction.moveToX(orb.position.x, duration: 0.5)
    theCamera.runAction(action)

    }
}

Answer 1

您可以使用 didSimulatePhysics 方法而不是 update 方法来解决此问题。

将更新方法替换为:

>     override func didSimulatePhysics() {
>         let action = SKAction.moveToX(orb.position.x, duration: 0.5)
>         theCamera.runAction(action)
>     }