ios - 我小时候在我的玩家类中为我的玩家制作了一个 Hitbox Sprite 。我如何在 gamescene 的 didBegin 方法中访问那个 hitbox Sprite ？

Question

这个“hitbox”的目的是让玩家只能在地面/平台上行走时跳跃。hitbox 比玩家宽一点，并且在玩家的脚上。这是我的播放器类:

class Player: SKSpriteNode {

  let maxPlayerSpeed:CGFloat = 300
  static var isPlayerOnGround = false



    init() {

        //players texture
        let texture = SKTexture(imageNamed: "playerMove1")

        super.init(texture: texture, color: SKColor.clear, size: texture.size())

        //hitbox that sits underneath the player and follows him
        let jumpHitBox = SKSpriteNode(color: .red, size: CGSize(width: texture.size().width - (texture.size().width / 8), height: texture.size().height / 5))

        jumpHitBox.position.y = (-texture.size().height) + (texture.size().height / 2)
        jumpHitBox.alpha = 0.5
        jumpHitBox.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: jumpHitBox.size.width,
                                                                   height: jumpHitBox.size.height))

        jumpHitBox.zPosition = 3
        jumpHitBox.physicsBody?.pinned = true
        jumpHitBox.physicsBody?.allowsRotation = false
        jumpHitBox.physicsBody?.categoryBitMask = CollisionTypes.playerJump.rawValue
        jumpHitBox.physicsBody?.collisionBitMask = 0
        jumpHitBox.physicsBody?.contactTestBitMask = CollisionTypes.ground.rawValue
        addChild(jumpHitBox)



        physicsBody = SKPhysicsBody(rectangleOf: size)
        physicsBody?.categoryBitMask = CollisionTypes.player.rawValue
        physicsBody?.contactTestBitMask = CollisionTypes.star.rawValue | CollisionTypes.saw.rawValue | CollisionTypes.finish.rawValue
        physicsBody?.collisionBitMask = CollisionTypes.ground.rawValue
        physicsBody?.affectedByGravity = true
        physicsBody?.restitution = 0.2
        physicsBody?.isDynamic = true
        physicsBody?.allowsRotation = false
        setScale(0.6)
        zPosition = 5
        physicsBody?.linearDamping = 0.0 }

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

我想在此方法中使用 jumpHitBox 作为 GameScene.swift 中的附加 contact.bodyA/B 节点:

func didBegin(_ contact: SKPhysicsContact) {

        if contact.bodyA.node == player {
           playerCollided(with: contact.bodyB.node!)


        } else if contact.bodyB.node == player {
           playerCollided(with: contact.bodyA.node!)

        }
    }

我不知道如何在 GameScene.swift 的 didBegin 中从我的玩家类引用 jumpHitBox 子节点。

非常感谢任何建议。

编辑:我在

处遇到错误

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

我没有在我的播放器类中放任何东西，但是自从将 jumpHitBox 子画面移动到全局声明后，我在所需的 init 中的 super.init(coder: aDecoder) 行收到错误消息:Property 'self.jumpHitBox'未在 super.init 调用时初始化

Answer 1

虽然我会尝试注释中提到的更简单的 velocity.dy 方法，但您的问题是您的 hitbox 是在初始化程序的范围内声明的，因此您只能在那里访问它。如果你给 hitbox 一个更高的范围，比如类属性，那么你几乎可以在任何地方访问它:

class Player: SKSpriteNode {

  let maxPlayerSpeed:CGFloat = 300

  // This is probably going to cause you bugs later btw.. it should probably be
  // just a regular property:
  static var isPlayerOnGround = false

  // Now you can just call playerInstance.jumpHitBox :
  private(set) var jumpHitBox = SKSpriteNode()

  init() {

    //players texture
    let texture = SKTexture(imageNamed: "playerMove1")

    super.init(texture: texture, color: SKColor.clear, size: texture.size())
    jumpHitBox = SKSpriteNode(color: .red, size: CGSize(width: texture.size().width - (texture.size().width / 8), height: texture.size().height / 5))
    //hitbox that sits underneath the player and follows him
  }
}

---

更新:

class Player: SKSpriteNode {

  let maxPlayerSpeed:CGFloat = 300

  // This is probably going to cause you bugs later btw.. it should probably be
  // just a regular property:
  static var isPlayerOnGround = false

  // Now you can just call playerInstance.jumpHitBox :
  var jumpHitBox = SKSpriteNode()

  private func makeHitBox() -> SKSpriteNode {
    let texture = SKTexture(imageNamed: "playerMove1")

    //hitbox that sits underneath the player and follows him
    let localJumpHitBox = SKSpriteNode(color: .red, size: CGSize(width: texture.size().width - (texture.size().width / 8), height: texture.size().height / 5))

    localJumpHitBox.position.y = (-texture.size().height) + (texture.size().height / 2)
    localJumpHitBox.alpha = 0.5
    localJumpHitBox.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: localJumpHitBox.size.width,
                                                                    height: localJumpHitBox.size.height))

    localJumpHitBox.zPosition = 3
    localJumpHitBox.physicsBody?.pinned = true
    localJumpHitBox.physicsBody?.allowsRotation = false
    localJumpHitBox.physicsBody?.categoryBitMask = CollisionTypes.playerJump.rawValue
    localJumpHitBox.physicsBody?.collisionBitMask = 0
    localJumpHitBox.physicsBody?.contactTestBitMask = CollisionTypes.ground.rawValue

    return localJumpHitBox
  }

  init() {

    //players texture
    let texture = SKTexture(imageNamed: "playerMove1")

    super.init(texture: texture, color: SKColor.clear, size: texture.size())

    physicsBody = SKPhysicsBody(rectangleOf: size)
    physicsBody?.categoryBitMask = CollisionTypes.player.rawValue
    physicsBody?.contactTestBitMask = CollisionTypes.star.rawValue | CollisionTypes.saw.rawValue | CollisionTypes.finish.rawValue
    physicsBody?.collisionBitMask = CollisionTypes.ground.rawValue
    physicsBody?.affectedByGravity = true
    physicsBody?.restitution = 0.2
    physicsBody?.isDynamic = true
    physicsBody?.allowsRotation = false
    setScale(0.6)
    zPosition = 5
    physicsBody?.linearDamping = 0.0
  }

  required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder) //error here
    jumpHitBox = makeHitBox()
    addChild(jumpHitBox)
  }
}