缺少联系代表

Question

我正在努力为我的应用程序提高一个新的级别。老实说，我只是将我的代码从视图控制器和游戏场景复制并粘贴到我更改名称的其他文件中。是的，我也更改了文件中的名称，这样它就会与新级别相匹配。但是，我的联系人代表现在无法在我的新级别上工作。我该怎么解决这个问题？

Cannot assign value of type 'Level1' to type 'SKPhysicsContactDelegate?'

我做错了什么？我刚刚检查了我在创建新级别之前的主文件，现在它有错误。我没有更改任何编码。

import SpriteKit
import GameplayKit
class Level1: SKScene {
var ball = SKSpriteNode()
var danger1 = SKSpriteNode()
var danger2 = SKSpriteNode()
var goal = SKSpriteNode()

over
ride func didMove(to view: SKView) {
physicsWorld.contactDelegate = self
ball = self.childNode(withName: "ball") as! SKSpriteNode
danger1 = self.childNode(withName: "danger1") as! SKSpriteNode
danger2 = self.childNode(withName: "danger2") as! SKSpriteNode
goal = self.childNode(withName: "goal") as! SKSpriteNode
let border = SKPhysicsBody(edgeLoopFrom: self.frame)
border.friction = 0
border.restitution = 0
danger1.physicsBody = SKPhysicsBody(rectangleOf: danger1.size)
danger1.physicsBody?.categoryBitMask = PhysicsCategories.dangerCategory
danger1.physicsBody?.isDynamic = false
danger2.physicsBody = SKPhysicsBody(rectangleOf: danger2.size)
danger2.physicsBody?.categoryBitMask = PhysicsCategories.dangerCategory
danger2.physicsBody?.isDynamic = false
ball.physicsBody = SKPhysicsBody(circleOfRadius: ball.size.width/2)
ball.physicsBody?.categoryBitMask = PhysicsCategories.ballCategory
ball.physicsBody?.contactTestBitMask = PhysicsCategories.dangerCategory | PhysicsCategories.goalCategory
ball.physicsBody?.collisionBitMask = PhysicsCategories.none
ball.physicsBody?.isDynamic = true
ball.physicsBody!.affectedByGravity = false
goal.physicsBody = SKPhysicsBody(rectangleOf: goal.size)
goal.physicsBody?.categoryBitMask = PhysicsCategories.goalCategory
goal.physicsBody?.isDynamic = false

setupPhysics()
startGame()
}
func setupPhysics() {
physicsWorld.gravity = CGVector(dx: 0.0, dy: 0.0)
physicsWorld.contactDelegate = self
}

func startGame() {
ball.position = CGPoint(x: 0, y: 550)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches {
}
}
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
for touch in touches {
let location = touch.location(in: self)
ball.position.x = location.x
ball.position.y = location.y
}
}
override func update(_ currentTime: TimeInterval) {
// Called before each frame is rendered
}
}
extension GameScene: SKPhysicsContactDelegate {

func didBegin(_ contact: SKPhysicsContact) {
let contactMask = contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask
if contactMask == PhysicsCategories.ballCategory | PhysicsCategories.dangerCategory {
print("Contact")
} else if contactMask == PhysicsCategories.ballCategory | PhysicsCategories.goalCategory {
print("goal contact")
}
}
}

Answer 1

与其创建GameScene的扩展，不如创建Level1的扩展

extension Level1: SKPhysicsContactDelegate