为什么联系人在 SpriteView 中不起作用

Question

我想知道两个精灵何时相互接触，但我无法让它工作。

下面的代码重现了这个问题。我希望当我点击红色方块并且黄色方块到达它时，联系委托方法会触发。但是，没有任何反应。代码看似很多，其实很简单。我添加了评论以使其更易于阅读：

class GameScene: SKScene, SKPhysicsContactDelegate {
    private var node: SKSpriteNode!
    
    override func didMove(to view: SKView) {
        // Set contact delegate to this class
        physicsWorld.contactDelegate = self

        // Have the Game Scene be the same size as the View
        size = view.frame.size

        // Create a yellow square with a volume based physics body that isn't dynamic
        node = SKSpriteNode(color: .yellow, size: CGSizeMake(50, 50))
        node.position = CGPointMake(100, 100)
        node.physicsBody = SKPhysicsBody(rectangleOf: CGSizeMake(50, 50))
        node.physicsBody!.isDynamic = false

        // Set it's contact bit mask to any value (default category bitmask of 
        // SKSpriteNode is 0xFFFFFFFF so any value over here would do)
        node.physicsBody!.contactTestBitMask = 1

        // Add it to the Scene
        addChild(node)
        
        // Create a red square with a volume based physics body that isn't dynamic
        let otherNode = SKSpriteNode(color: .red, size: CGSizeMake(50, 50))
        otherNode.physicsBody = SKPhysicsBody(rectangleOf: CGSizeMake(50, 50))
        otherNode.physicsBody!.isDynamic = false

        // Set the position to be 100 pts to the right of the yellow square
        otherNode.position = CGPointMake(200, 100)

        // Add it to the Scene
        addChild(otherNode)
    }
    
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        // Moves yellow square to where you tapped on the screen
        guard let finger = touches.first?.location(in: self) else { return }
        node.run(.move(to: finger, duration: 1))
    }

    func didBegin(_ contact: SKPhysicsContact) {
        print("did begin contact")
    }
}

struct ContentView: View {
    var body: some View {
        VStack {
            Text("Game")
            SpriteView(scene: GameScene(), debugOptions: [.showsPhysics, .showsNodeCount])
        }
        .padding()
    }
}

谁能告诉我我做错了什么？

提前致谢

Answer 1

如果

didBegin(contact:)

.isDynamic = false

不会触发所以删除这些行并添加

physicsWorld.gravity = .zero

以防止节点掉落。

你还需要

contactTestBitMask = 1

两个节点，而不仅仅是第一个。

Answer 2

当你使用物理体时，你应该避免使用动作移动节点。而是通过设置力和/或脉冲来移动身体，使用像 applyForce(_:) 和 applyImpulse(_:).

这样的方法

这样做可能会解决您的问题，但这也会让物理引擎正确模拟物理交互。