如何从代码访问实体 - 游戏工具包

Question

我在场景中添加了一个节点。同样在场景中，我给了它一个反弹的组件。该组件如下所示：

class BounceComponent: GKComponent, ComponentSetupProt {

var bounce: SKAction?
var node: SKSpriteNode?

@GKInspectable var diff: CGFloat = 0.2
@GKInspectable var startScale: CGFloat = 1
@GKInspectable var duration: TimeInterval = 0.5

override init() {
    super.init()
    comps.append(self)
}

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}

func setup() {
    print("setup")
    node = entity?.component(ofType: GKSKNodeComponent.self)!.node as? SKSpriteNode
    setupBounce()
}

func setupBounce() {
    ...
}

func performBounce() {
    print("performing")
    node?.run(bounce!)
}
}//

在我的场景文件的 didMove 函数中，它调用组件 setup()。这很好用。我试图在单击按钮时调用函数 performBounce()...

    if (play?.contains(pos))! {
        print("test")
        if let _ = play?.entity {
            print("we have an entity")
        }
        play?.entity?.component(ofType: BounceComponent.self)?.performBounce()
    }

当我点击时，它唯一打印的是 "test" 并且实体为 nil。我假设当你向编辑器添加一个节点时，它也会为该节点设置实体，所以我不确定为什么它是零。想知道是否有人可以对此有所了解？

感谢您的帮助！

Answer 1

SKSpriteNode 上的实体是一个弱引用，您需要确保保留 gameplaykit 对象中的实体

class GameViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Load 'GameScene.sks' as a GKScene. This provides gameplay related content
        // including entities and graphs.
        if let scene = GKScene(fileNamed: "Main") {

            // Get the SKScene from the loaded GKScene
            if let sceneNode = scene.rootNode as? Main {

                sceneNode.entities = scene.entities // add this

                // Set the scale mode to scale to fit the window
                sceneNode.scaleMode = .aspectFill

                // Present the scene
                if let view = self.view as! SKView? {
                    view.presentScene(sceneNode)
                    view.showsDrawCount = true
                    view.ignoresSiblingOrder = true
                    view.showsFPS = true
                    view.showsNodeCount = true
                }
            }
        }
    }



class Main: Base {
    var entities = [GKEntity]() // add this

如何从代码访问实体 - 游戏工具包

how to access entity from code - gameplay kit

swift

xcode

sprite-kit

skaction

gameplay-kit