swift - 如何使用 SpriteKit 与已创建的 SKSpriteNode 创建碰撞？

Question

我希望 pacman 在与正在移动的眨眼碰撞时从其原始位置重新启动。

考虑到我已经声明了它们，我怎样才能使它们发生碰撞？

你移动吃 bean 人，但眨眼独自移动。我希望它像吃 bean 人游戏一样工作。

  public class PacmanScene: SKScene {

let playerSpeed: CGFloat = 40.0
var pacman: SKSpriteNode?
var playerTextures: [SKTexture] = []
var lastTouch: CGPoint? = nil
var blinky: SKSpriteNode?
var clyde: SKSpriteNode?
var inky: SKSpriteNode?
var pinky: SKSpriteNode?
override public init(size: CGSize) {
let pacmanTexture = SKTexture(imageNamed: "pacman01.png")
    pacman = SKSpriteNode(texture: pacmanTexture)
    pacman?.name = "pacman"

    pacman?.position = CGPoint(x:30, y:30)
    pacman?.zPosition = 1.0
    pacman?.physicsBody = SKPhysicsBody(texture: pacmanTexture, size: CGSize(width: (pacman?.size.width)!, height: (pacman?.size.height)!))
    pacman?.physicsBody?.allowsRotation = true
    pacman?.physicsBody?.affectedByGravity = false
    pacman?.physicsBody?.mass = 2
 let blinkyTexture = SKTexture(imageNamed: "blinky.png")
    blinky = SKSpriteNode(texture: blinkyTexture)
    blinky?.name = "blinky"

    blinky?.position = CGPoint(x: 15, y: 60)
    blinky?.zPosition = 1.0
    blinky?.physicsBody = SKPhysicsBody(texture: pacmanTexture, size: CGSize(width: (blinky?.size.width)!, height: (blinky?.size.height)!))
    blinky?.physicsBody?.allowsRotation = false
    blinky?.physicsBody?.affectedByGravity = false
    blinky?.physicsBody?.mass = 1000

    super.init(size: size)
    addChild(pacman!)
    addChild(blinky!)

   override public func didMove(to view: SKView) {

    let bmoveUp = SKAction.moveBy(x: 0, y: 450, duration: 4.0)

    let bmoveRight = SKAction.moveBy(x:20, y:0, duration: 1.0)

    let bmoveDown = SKAction.moveBy(x:0, y: -450, duration: 4.0)

   let bmoveLeft = SKAction.moveBy(x:-20, y:0, duration: 1.0)


    let bsequence = SKAction.sequence([bmoveUp, bmoveRight, bmoveDown, bmoveLeft])

    let bendlessAction = SKAction.repeatForever(bsequence)
    blinky?.run(bendlessAction)
 }

Answer 1

如果 iv 做对了，你希望你的“blinky”跟随你的“pacman”来做到这一点，那么你必须计算出 pacman 的位置，然后向你的眨眼添加一个 SKAction 以移动到该位置。

尝试这样的事情

//Speed blinky moves
let blinkySpeed = 100

override func update(_ currentTime: TimeInterval) {
    // Called before each frame is rendered
    updateBlinky()
}

func updateBlinky() {
    //Set the point that blinky moves to
    let point = CGPoint(x: pacman.position.x, y: pacman.position.y)
    //Get the distance its got to travel
    let distance = distanceBetweenPoints(first: pacman.position, second: blinky.position)
    //Get the time is got to take from the speed and distance
    let time = distance / blinkySpeed
    //Create and run the action
    let action = SKAction.move(to: point, duration: TimeInterval(time))
    blinky.run(action)
}

//work out the distance between the sprites
func distanceBetweenPoints(first: CGPoint, second: CGPoint) -> Int {
    return Int(hypot(second.x - first.x, second.y - first.y))
}

最终的结果是这样的

编辑:

好吧，我认为从你的问题来看，你已经有“闪烁”的移动，你只是想检测碰撞。

首先，您需要将 SKPhysicsContactDelegate 添加到您的类中

public class PacmanScene: SKScene, SKPhysicsContactDelegate {

然后您需要为两个 Sprite 添加类别位掩码，然后在 didBegin(_ contact: SKPhysicsContact) 方法中处理碰撞。

我会做什么

//Create Physics category struct
struct PhysicsCategory {
    static let pacman : UInt32 = 0x1 << 1
    static var blinky : UInt32 = 0x1 << 2
}

然后在设置 pacman 和眨眼的地方设置类别位掩码

//Set the category bit mask for pacman
pacman?.physicsBody?.categoryBitMask = PhysicsCategory.pacman
//Set what categories you want to test contact
pacman?.physicsBody?.contactTestBitMask = PhysicsCategory.blinky
//Set what categories you want to collide with each other
pacman?.physicsBody?.collisionBitMask = PhysicsCategory.blinky

//Set the category bit mask for blinky
blinky?.physicsBody?.categoryBitMask = PhysicsCategory.blinky
//Set what categories you want to test contact
blinky?.physicsBody?.contactTestBitMask = PhysicsCategory.pacman
//Set what categories you want to collide with each other
blinky?.physicsBody?.collisionBitMask = PhysicsCategory.pacman

然后您需要实现 didBegin(_ contact: SKPhysicsContact) 方法来处理碰撞

func didBegin(_ contact: SKPhysicsContact) {
    //Work out which contact was pacman
    let other = contact.bodyA.categoryBitMask == PhysicsCategory.pacman ? contact.bodyB : contact.bodyA
    //Test what it hit
    switch other.categoryBitMask {

        case PhysicsCategory.blinky:
            print("pacman hit blinky")
            //Move pacman
            pacman?.position = CGPoint(x:30, y:30)

        default:
        break

    }
}

希望这有帮助