Question

我正在尝试使用Xcode 10.1和Swift 4.2构建我的第一个基于SpriteKit的游戏。现在，我只是想让redBall在屏幕周围和边缘弹起。接下来我将添加blueBall。此时没有用户交互，我只希望球反弹并立即碰撞。

但是，我正在尝试以运动中的redBall开始，但这没有用。我尝试设置速度，施加力和施加脉冲。我尝试将redBall的质量及其摩擦设置为0.0。我知道我的游戏中的物理原理是可以正常工作的。如果我打开重力，球会掉到底部边缘，弹跳并停下来。

我认为我缺少一些简单的东西，但是我无法弄清楚那是什么。

import SpriteKit

enum PhysicsCategory {
    static let none: UInt32     = 0
    static let redBall: UInt32  = 0x1 << 0
    static let blueBall: UInt32 = 0x1 << 1
    static let edge: UInt32     = 0x1 << 2
    static let all: UInt32      = UInt32.max
}

class GameScene: SKScene, SKPhysicsContactDelegate {

    override func didMove(to view: SKView) {

        let redBall = SKSpriteNode(texture: SKTexture(imageNamed: "ball"), color: .red, size: CGSize(width: 40.0, height: 40.0))
        redBall.colorBlendFactor = 1.0
        redBall.position = CGPoint(x: frame.midX, y: frame.midY)
        redBall.physicsBody = SKPhysicsBody(circleOfRadius: redBall.size.width/2)
        redBall.physicsBody?.categoryBitMask = PhysicsCategory.redBall
        redBall.physicsBody?.collisionBitMask = PhysicsCategory.all
        redBall.physicsBody?.contactTestBitMask = PhysicsCategory.blueBall | PhysicsCategory.edge
        //redBall.physicsBody?.velocity = CGVector(dx: 1.0, dy: 1.0)
        //redBall.physicsBody?.applyImpulse(CGVector(dx: 1.0, dy: 1.0))
        redBall.physicsBody?.applyForce(CGVector(dx: 1.0, dy: 1.0))
        //redBall.physicsBody?.mass = 0.0
        //redBall.physicsBody?.friction = 0.0
        addChild(redBall)

        let edgeRect = CGRect(x: 0, y: 0, width: frame.size.width, height: frame.size.height)
        physicsBody = SKPhysicsBody(edgeLoopFrom: edgeRect)
        physicsBody?.categoryBitMask = PhysicsCategory.edge
        physicsBody?.collisionBitMask = PhysicsCategory.all
        physicsBody?.contactTestBitMask = PhysicsCategory.redBall | PhysicsCategory.blueBall

        setupPhysics()
    }

    func setupPhysics() {
        physicsWorld.gravity = CGVector(dx: 0, dy: 0)
        physicsWorld.contactDelegate = self
    }

}

SKPhsyics速度未发生

0 个答案: