Question

我试图通过骑2个精灵来创造一个不断移动的背景。运行我的代码表明精灵已经以正确的大小添加到正确的位置。然而，精灵在屏幕上看不到。为什么会这样？我的代码在下面

import SpriteKit
import GameplayKit
import CoreMotion

class GameScene: SKScene, SKPhysicsContactDelegate{

    var ship = SKSpriteNode()
    var actionMoveRight = SKAction()
    var actionMoveLeft = SKAction()
    let shipCategory = 0x1 << 1
    let obstacleCategory = 0x1 << 2
    let backgroundVelocity : CGFloat = 3.0
    var motionManager = CMMotionManager()
    var background = SKSpriteNode.init(imageNamed: "background")

    override func didMove(to view: SKView) {
        // Making self delegate of physics world)
        self.anchorPoint = CGPoint.init(x: 0.5, y: 0.5)
        self.physicsWorld.gravity = CGVector.zero
        self.physicsWorld.contactDelegate = self
        createBG()
        addShip()
    }

    override func update(_ currentTime: CFTimeInterval) {
        moveBG()
    }

    func createBG(){
        for i in 0...2{
            background = SKSpriteNode.init(imageNamed: "background")
            background.name = "background"
            background.size = CGSize.init(width: (self.scene?.size.width)!, height: (self.scene?.size.height)!)
            background.anchorPoint = self.anchorPoint
            background.position = CGPoint.init(x: CGFloat(i) * background.size.width, y: (-(self.frame.size.height/2)))
            background.zPosition = 0
            self.addChild(background)
        }
    }

    func moveBG(){
        self.enumerateChildNodes(withName: "background", using: ({
            (node, error) in

            node.position.x -= 10
            if node.position.x < (self.scene?.size.width)!{
                node.position.x += (self.scene?.size.width)! * 2
            }
        }))
    }

    func addShip() {
        // Initializing spaceship node
        ship = SKSpriteNode(imageNamed: "Spaceship")
        ship.setScale(0.2)
        ship.isHidden = false
        ship.zRotation = CGFloat(0)
        // Adding SpriteKit physics body for collision detection
        ship.physicsBody = SKPhysicsBody(rectangleOf: ship.size)
        ship.physicsBody?.categoryBitMask = UInt32(shipCategory)
        ship.physicsBody?.isDynamic = true
        ship.physicsBody?.contactTestBitMask = UInt32(obstacleCategory)
        ship.physicsBody?.collisionBitMask = 0
        ship.name = "ship"
        ship.position = CGPoint.init(x: 0, y: (-(self.frame.size.height/2)) + ship.size.height/2)
        ship.zPosition = 1
        self.addChild(ship)
        actionMoveRight = SKAction.moveBy(x: 5, y: 0, duration: 0.2) //9
        actionMoveLeft = SKAction.moveBy(x: -5  , y: 0, duration: 0.2) //10
        if motionManager.isAccelerometerAvailable == true {
            motionManager.startAccelerometerUpdates(to: OperationQueue.current!, withHandler:{
                data, error in
                if (data!.acceleration.y) < -0.05 {
                    self.ship.run(self.actionMoveLeft)
                }

                else if data!.acceleration.y > 0.05 {
                    self.ship.run(self.actionMoveRight)
                }

            })

        }
    }
}

Answer 1

我假设背景节点大小与图像大小相同。我还假设场景大小与图像大小相同。如果是这种情况，请尝试以下操作。

let backTexture = SKTexture(imageNamed: "background")
let background = SKSpriteNode(texture: backTexture)
//background.size = CGSize.init(width: (self.scene?.size.width)!, height: (self.scene?.size.height)!)
//background.anchorPoint = self.anchorPoint
background.position = CGPoint(x: CGFloat(i) * background.size.width, y: 0))

精灵出现在节点计数中但不可见

1 个答案: