为什么 sprite 没有碰撞却相互接触？

Question

我正在尝试制作一个简单的 SpriteKit 游戏。屏幕上有两个精灵。其中之一是射击激光枪。当激光穿过屏幕时，它应该被错过。 子弹和 sprite 没有相互接触但接触检测函数调用。我不明白这是怎么回事？我正在使用 SkAction 功能从上层精灵射击。所有精灵和激光枪都有不同的 UInt32 categorybitmask 值。

感谢您的帮助。

var sprite = SKSpriteNode(imageNamed: "Spaceship")
var sprite02 = SKSpriteNode(imageNamed: "Spaceship")
var actionMove = SkAction.scaleYTo(12, duration: 0.5)


    sprite.position = CGPoint(x: self.frame.width/2, y: self.frame.height * 3/4)
    sprite.yScale = 0.2
    sprite.xScale = 0.2

    sprite.physicsBody = SKPhysicsBody(rectangleOfSize: sprite.size)
    sprite.physicsBody!.dynamic = true
    sprite.physicsBody!.affectedByGravity = false
    sprite.physicsBody!.categoryBitMask = BodyType.ship02.rawValue
    sprite.physicsBody!.contactTestBitMask = BodyType.laser.rawValue
    sprite.physicsBody!.collisionBitMask = 0

    self.addChild(sprite)

    sprite02.position = CGPoint(x: self.frame.width/2, y: self.frame.height * 1/4)
    sprite02.yScale = 0.2
    sprite02.xScale = 0.2

    sprite02.physicsBody = SKPhysicsBody(rectangleOfSize: sprite.size)
    sprite02.physicsBody!.dynamic = true
    sprite02.physicsBody!.affectedByGravity = false
    sprite02.physicsBody!.categoryBitMask = BodyType.ship01.rawValue
    sprite02.physicsBody!.contactTestBitMask = BodyType.laser.rawValue
    sprite02.physicsBody!.collisionBitMask = 0

    self.addChild(sprite02)

我是这样检查接触检测的

    func didBeginContact(contact: SKPhysicsContact) {

    let contactMask = contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask

    println(contactMask) 
}

    // Laser gun properties
    func laserNode(positionNode: CGPoint, rotationNode: CGFloat, name: String) -> SKSpriteNode {

    var laser = SKSpriteNode()


    laser.color = UIColor.greenColor()
    laser.position = positionNode
    laser.anchorPoint = CGPoint(x: 0.0, y: 0.0)
    laser.size = CGSize(width: 3, height: 50)
    laser.zPosition = -1
    laser.zRotation = rotationNode
    laser.name = name

    laser.physicsBody = SKPhysicsBody(rectangleOfSize: CGSize(width: laser.size.width * 2, height: laser.size.height*2))
    laser.physicsBody!.dynamic = true
    laser.physicsBody!.affectedByGravity = false
    laser.physicsBody!.categoryBitMask = BodyType.laser.rawValue
    laser.physicsBody!.contactTestBitMask = BodyType.ship01.rawValue | BodyType.ship02.rawValue | BodyType.ship03.rawValue | BodyType.ship04.rawValue
    laser.physicsBody!.collisionBitMask = 0


    laser.runAction(actionMove)
    laserArray.append(laser)


    self.addChild(laser)

    return laser
}

Answer 1

所以我遇到了完全相同的问题。我不完全知道确切的问题是什么，但我通过将精灵的 hitbox 更改为圆形而不是矩形来修复它。尝试将 sprites Physic Bodies 的声明更改为此。

sprite.physicsBody = SKPhysicsBody(circleOfRadius: sprite.size)

sprite02.physicsBody = SKPhysicsBody(circleOfRadius: sprite.size)

laser.physicsBody = SKPhysicsBody(circleOfRadius: CGSize(width: laser.size.width * 2, height: laser.size.height*2))

我认为问题在于如何将矩形碰撞框放置在 sprite 周围，但如果将其更改为圆形，它应该可以正常工作。

为什么 sprite 没有碰撞却相互接触？

Why are sprites in contact with each other although they do not collide ?

contact

collision

skaction

swift