使用 SKY SpriteKit 和 Swift 4 移动和旋转精灵

Posted 2023-05-08

【中文标题】使用 SKY SpriteKit 和 Swift 4 移动和旋转精灵

【英文标题】：Moving and rotating sprite with touches using SKSpriteKit and Swift 4

【发布时间】：2019-03-24 01:31:42

【问题描述】：

我希望我的精灵“字符”在我移动时移动和旋转“跟随”我的手指。我让它工作正常，但不知何故设法搞砸了。我不确定我做了什么，但我一生都无法弄清楚。

任何帮助将不胜感激。我确定它是愚蠢的，我只是忽略了。提前致谢。

标记

GameScene.swift

import SpriteKit
import GameplayKit

//MARK: ---------------Global Variables Section

var nodeType: String = String()

var characterNode = Character()
let characterImage: String = String("default_pose")
var characterTexture:SKTexture = SKTexture()
let characterSize: CGSize = CGSize(width: 64, height: 64)
let characterPosition: CGPoint = CGPoint(x: 0, y: 0)

var enemyNode = Enemy()
let enemyImage: String = String("blob1")
var enemyTexture = SKTexture()
let enemySize: CGSize = CGSize(width: 50, height: 50)
let enemyPosition: CGPoint = CGPoint(x: 150, y: 150)


class GameScene: SKScene, SKPhysicsContactDelegate 


    //MARK: --------------------Class Variables Section

    var affectedByGravity: Bool = false
    var dynamic: Bool = true
    var rotation: Bool = false

    var lastUpdateTime: CFTimeInterval = 0

    //MARK: --------------------DidMove to View Section

    override func didMove(to view: SKView) 

        var node = SKSpriteNode()

        node = addNode(NodeType: "Character")
        applyPhysics(physicsNode: node, nodeImage: characterImage, nodeSize: characterSize, nodeName: node.name!)
        node.zPosition = 10
        addChild(node)

        node = addNode(NodeType: "Enemy")
        applyPhysics(physicsNode: node, nodeImage: enemyImage, nodeSize: enemySize, nodeName: node.name!)
        node.zPosition = 9
        addChild(node)
    


    //MARK: -----------------------Add Node Section

    func addNode(NodeType: String) -> SKSpriteNode 

        var node = SKSpriteNode()

        switch NodeType 

        case "Enemy":

            node = enemyNode.setupNode(nodeName: "Enemy", nodeImage: "blob1", nodeSize: enemySize, nodePosition: enemyPosition)

        default:
            node = characterNode.setupNode(nodeName: "Player", nodeImage: "default_pose", nodeSize: characterSize, nodePosition: characterPosition)
        
        return node
    

    //MARK: ------------------------Physics Section

    func applyPhysics(physicsNode: SKSpriteNode, nodeImage: String, nodeSize: CGSize, nodeName: String) 

        let nodeTexture: SKTexture = SKTexture(imageNamed: nodeImage)

        physicsNode.physicsBody = SKPhysicsBody(texture: nodeTexture, size: nodeSize)
        physicsNode.physicsBody?.isDynamic = dynamic
        physicsNode.physicsBody?.affectedByGravity = affectedByGravity
        physicsNode.physicsBody?.allowsRotation = rotation
        physicsNode.physicsBody?.categoryBitMask = 1
        physicsNode.physicsBody?.contactTestBitMask = 1
        physicsNode.physicsBody?.collisionBitMask = 1

    

    //MARK: ------------------------Movement and Rotation Section

    func moveAndRotate(sprite: Character, toPosition position: CGPoint) 

        let angle = atan2(position.y - sprite.position.y, position.x - sprite.position.x)

        let rotateAction = SKAction.rotate(toAngle: angle - .pi / 2, duration: 0.05, shortestUnitArc:true)

        sprite.run(rotateAction)

        let offsetX = position.x - (sprite.position.x)
        let offsetY = position.y - (sprite.position.y)

        let normal = simd_normalize(simd_double2(x: Double(offsetX), y:Double(offsetY)))

        characterNode.velocity = CGVector(dx: CGFloat(normal.x) * sprite.movePointsPerSecond, dy: CGFloat(normal.y) * sprite.movePointsPerSecond)
    

    //MARK: ----------------------Touches Section

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) 
        if let touch = touches.first 
            let touchLocation = touch.location(in: self)
            characterNode.isMoving = true
            moveAndRotate(sprite: characterNode, toPosition: touchLocation)
        
    

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) 

        if let touch = touches.first 
            let touchLocation = touch.location(in: self)
            moveAndRotate(sprite: characterNode, toPosition: touchLocation)
        
    

    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) 

        characterNode.isMoving = false
    


    //MARK: ------------------Update Section

    override func update(_ currentTime: TimeInterval) 

        let deltaTime = max(1.0/30, currentTime - lastUpdateTime)
        lastUpdateTime = currentTime

        update(character: characterNode, dt: deltaTime)
    

    func update(character: Character, dt: CFTimeInterval) 
        if characterNode.isMoving == true 
            let newX = character.position.x + character.velocity.dx * CGFloat(dt)
            let newY = character.position.y + character.velocity.dy * CGFloat(dt)

            character.position = CGPoint(x: newX, y: newY)
        
    

Character.swift

import SpriteKit
import GameplayKit

class Character: SKSpriteNode 

    let movePointsPerSecond: CGFloat = 150.0
    var velocity = CGVector(dx: 0.0, dy: 0.0)
    var isMoving = false

    var node: SKSpriteNode = SKSpriteNode()

    func setupNode(nodeName: String, nodeImage: String, nodeSize: CGSize, nodePosition: CGPoint) -> SKSpriteNode 

        node = SKSpriteNode(imageNamed: nodeImage)
        node.name = nodeName
        node.position = nodePosition

        return node
    

【问题讨论】：

忘了说它目前在做什么，什么都没有。 :)。他只是站在那里看起来很愚蠢。

我建议“编辑”来编辑您的问题，而不是发表评论说它什么都不做

您在一个动作中执行它，并且在每一个动作中您都附加一个新动作。这将是危险的，因为每次轮换行动都会相互叠加，这意味着您将浪费循环

【参考方案1】：

您的节点不会移动，因为您从未将 characterNode 分配给屏幕上的节点

   override func didMove(to view: SKView) 

        var node = SKSpriteNode()

        node = addNode(NodeType: "Character")
        applyPhysics(physicsNode: node, nodeImage: characterImage, nodeSize: characterSize, nodeName: node.name!)
        node.zPosition = 10
        addChild(node)
        characterNode = node //ADD THIS LINE
        node = addNode(NodeType: "Enemy")
        applyPhysics(physicsNode: node, nodeImage: enemyImage, nodeSize: enemySize, nodeName: node.name!)
        node.zPosition = 9
        addChild(node)