swift - swift 4中两个节点之间的碰撞检测

Question

我想在化身和障碍物之间进行碰撞检测，所以每当发生碰撞时，它应该打印“collision”，但即使那样也不起作用，所以问题是，它没有检测到任何碰撞.如果它会发生碰撞，它应该区分玩家和障碍物。

class GameScene: SKScene, SKPhysicsContactDelegate {
    let avatar = SKShapeNode(circleOfRadius: 20)

    let avatarCategory: UInt32 = 0*1 << 0
    let obstacleCategory: UInt32 = 0*1 << 1

    override func didMove(to view: SKView) {
        physicsWorld.contactDelegate = self

        createAvatar()
        spawnObstacles()
    }

    func createAvatar() {
        avatar.name = "avatarNode"
        avatar.physicsBody = SKPhysicsBody()
        avatar.physicsBody?.categoryBitMask = avatarCategory
        avatar.physicsBody?.contactTestBitMask = avatarCategory
        avatar.physicsBody?.collisionBitMask = 0
        avatar.physicsBody?.usesPreciseCollisionDetection = true
        avatar.physicsBody?.affectedByGravity = false
        avatar.zPosition = 2

        addChild(avatar)
    }

    func createRandomObstacle() {
        let obstacle = SKShapeNode()

        obstacle.name = "obstacleNode"
        obstacle.physicsBody = SKPhysicsBody()
        obstacle.physicsBody?.categoryBitMask = obstacleCategory
        obstacle.physicsBody?.contactTestBitMask = obstacleCategory
        obstacle.physicsBody?.collisionBitMask = 0
        obstacle.physicsBody?.usesPreciseCollisionDetection = true
        obstacle.physicsBody?.affectedByGravity = false
        obstacle.zPosition = 2

        addChild(obstacle)
    }

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

Answer 1

首先，avatarCategory 和 obstacleCategory 都是 0，因为:UInt32 = 0*1 << 1 = 0，所以让我们解决这个问题:

let avatarCategory: UInt32 = 1 << 0
let obstacleCategory: UInt32 = 1 << 1

现在 contactTestBitMask 表示您希望收到有关联系人通知的对象，因此您需要更改它:

avatar.physicsBody?.contactTestBitMask = obstacleCategory

和

obstacle.physicsBody?.contactTestBitMask = avatarCategor

现在试试吧😀

编辑:我的碰撞和接触分步指南: https://stackoverflow.com/a/51041474/1430420

以及碰撞和接触测试位掩码指南: https://stackoverflow.com/a/40596890/1430420