Question

所以我在游戏中对球进行了一些调整，并且为了避免解包可选值错误，我将以下内容进行了修改

//didMoveToView
    self.physicsWorld.gravity = CGVectorMake(0, 0)
    self.physicsWorld.contactDelegate = self
    let fieldBody = SKPhysicsBody.init(edgeLoopFromRect: self.frame)
    self.physicsBody = fieldBody
    self.physicsBody!.affectedByGravity = false
    self.physicsBody!.usesPreciseCollisionDetection = true
    self.physicsBody!.dynamic = true
    self.physicsBody!.mass = 0
    self.physicsBody!.friction = 0
    self.physicsBody!.linearDamping = 0
    self.physicsBody!.angularDamping = 0
    self.physicsBody!.restitution = 1
    self.physicsBody!.categoryBitMask = CollisionTypes.Floor.rawValue
    self.physicsBody!.contactTestBitMask = CollisionTypes.Ball.rawValue

    // Prepare the ball - physics engine.
    ball.physicsBody = SKPhysicsBody(circleOfRadius: ball.frame.width/2)
    ball.physicsBody!.affectedByGravity = true
    ball.physicsBody!.restitution = 0.8
    ball.physicsBody!.linearDamping = 0
    ball.physicsBody!.friction = 0.3
    ball.physicsBody!.dynamic = true
    ball.physicsBody!.mass = 0.5
    ball.physicsBody!.allowsRotation = true
    ball.physicsBody!.categoryBitMask = CollisionTypes.Ball.rawValue
    ball.physicsBody!.contactTestBitMask = CollisionTypes.Floor.rawValue
    ball.physicsBody!.collisionBitMask = CollisionTypes.Floor.rawValue
}

我做到了，我的游戏开始了，但是只要toucheBegan，就会出现同样的错误。我不知道如何解决所有这些无休止的错误。我是新手，不知道如何调整物理。我的contactBegin看起来像这样：

func didBeginContact(contact: SKPhysicsContact) {
    let bitMaskAAndB = contact.bodyA.categoryBitMask == CollisionTypes.Floor.rawValue &&
                contact.bodyB.categoryBitMask == CollisionTypes.Ball.rawValue
    let ballAndBoardMask = CollideType.Ball.toMask() | boards.usedCollideMasks

    // ball and board, handle it by board delegate
    if bitMaskAAndB | ballAndBoardMask == ballAndBoardMask {

        let boardNode: SKNode! = contact.bodyA.categoryBitMask == CollideType.Ball.toMask() ? contact.bodyB.node : contact.bodyA.node
        let board = boardNode.bind as! BoardDelegate
        board.didBeginContact(boardNode, ball: ball, contact: contact, game: self)
    }

    // ball and ceil => stop game
    else if bitMaskAAndB == CollideType.toMask([.Ball, .Ceil]) {
        stopGame()
    }

    // ball and floor => stop game add explosion or fall off screen
    else if bitMaskAAndB == CollideType.toMask([.Ball, .Floor]) {
        stopGame()
    }
}
func didEndContact(contact: SKPhysicsContact) {

    let ballAndBoardMask = CollideType.Ball.toMask() | boards.usedCollideMasks

    // ball and board, handle it by board delegate
    if contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask | ballAndBoardMask == ballAndBoardMask {

        let boardNode: SKNode! = contact.bodyA.categoryBitMask == CollideType.Ball.toMask() ? contact.bodyB.node : contact.bodyA.node
        let board = boardNode.bind as! BoardDelegate
        board.didEndContact(boardNode, ball: ball, contact: contact, game: self)
    }

}

编辑：我根据您提出的建议设置了我的物理世界并调整了我的didBeginContact乐趣，但是使用以下代码，我收到了多个错误：无法将bool类型的值转换为UInt32。

PS。谢谢你的帮助和耐心，这是所有新的术语，我尽我所能去理解。：）

Answer 1

我不知道您的CollideType课程或声明，因此下面的代码向您解释如何构建正确的physicsWorld和physicsBody以及不具备碰撞期间的问题。

但首先：我们将在这个项目中充分利用 categoryBitMask ， contactTestBitMask 和 collisionBitMask 属性，因为我们有非常精确的规则使项目有效：

categoryBitMask 是一个数字，用于定义此对象的类型考虑碰撞。
collisionBitMask 是一个定义对象类别的数字节点应该碰撞。
contactTestBitMask 是一个数字，用于定义我们想要的冲突收到通知。

SpriteKit希望使用UInt32描述这些三位掩码。您的位掩码应该从1开始，然后每次加倍。

代码：

class GameScene: SKScene, SKPhysicsContactDelegate {
    var ball: Ball!
    let ballSpeedX = CGFloat(500)
    enum CollisionTypes: UInt32 {
        case Field = 1
        case Ball = 2
    }
    override func didMoveToView(view: SKView) {
        // ball
        ball = Ball(imageNamed:"colorBall.png")
        ball.position = CGPointMake(self.ball.frame.size.width,self.ball.frame.size.height)

        // Prepare the world - physics engine.
        self.physicsWorld.gravity = CGVectorMake(0, -6)
        self.physicsWorld.contactDelegate = self
        let fieldBody = SKPhysicsBody.init(edgeLoopFromRect: self.frame)
        self.physicsBody = fieldBody
        self.physicsBody!.affectedByGravity = false
        self.physicsBody!.usesPreciseCollisionDetection = true
        self.physicsBody!.dynamic = true
        self.physicsBody!.mass = 0
        self.physicsBody!.friction = 0
        self.physicsBody!.linearDamping = 0
        self.physicsBody!.angularDamping = 0
        self.physicsBody!.restitution = 1
        self.physicsBody!.categoryBitMask = CollisionTypes.Field.rawValue
        self.physicsBody!.contactTestBitMask = CollisionTypes.Ball.rawValue

        // Prepare the ball - physics engine.
        ball.physicsBody = SKPhysicsBody(circleOfRadius: ball.frame.width/2)
        ball.physicsBody!.affectedByGravity = true
        ball.physicsBody!.restitution = 0.8
        ball.physicsBody!.linearDamping = 0
        ball.physicsBody!.friction = 0.3
        ball.physicsBody!.dynamic = true
        ball.physicsBody!.mass = 0.5
        ball.physicsBody!.allowsRotation = true
        ball.physicsBody!.categoryBitMask = CollisionTypes.Ball.rawValue
        ball.physicsBody!.contactTestBitMask = CollisionTypes.Field.rawValue
        ball.physicsBody!.collisionBitMask = CollisionTypes.Field.rawValue

        //ball.physicsBody!.categoryBitMask = CollideType.Ball.toMask()
        //ball.physicsBody!.collisionBitMask = CollideType.toMask([.Scene, .Ceil, .Floor]) | boards.usedCollideMasks
        //ball.physicsBody!.contactTestBitMask = CollideType.toMask([.Scene, .Ceil, .Floor]) | boards.usedCollideMasks
        ball.hidden = false
        self.addChild(ball)
    }
    func didBeginContact(contact: SKPhysicsContact) {
        if (contact.bodyA.categoryBitMask == CollisionTypes.Field.rawValue &&
            contact.bodyB.categoryBitMask == CollisionTypes.Ball.rawValue) {
            print("contact between field and ball")
        }
    }
}

正如您所看到的，第一件重要的事情是准备physicsWorld（跟踪物理必须工作的边界），为其分配一个类别，所有其他参数需要与其他对象进行交互。然后你构建你的对象的physicsBody，在这种情况下是球。

展开可选值：PhysicsBody - Swift SpriteKit

1 个答案: