未检测到 spritekit 物理碰撞

Posted 2023-03-08

【中文标题】未检测到 spritekit 物理碰撞

【英文标题】：spritekit physics collision not be detected

【发布时间】：2017-02-04 22:34:03

【问题描述】：

我有 4 个物理物体都可以很好地检测碰撞。但是，当它们相互碰撞时，有两个物理物体不会检测到。不过，它们确实会检测到它们何时与其他物理物体发生碰撞。我有所有它们的contacttestbitmasks，所以我不明白为什么会出现问题。这是一些代码： 这是我设置物理体的地方：

    struct PhysicsCategory
    static let None     : UInt32 = 0
    static let All      : UInt32 = UInt32.max
    static let player   : UInt32 = 0b1
    static let bounce   : UInt32 = 0b10
    static let blueball : UInt32 = 0b100
    static let redball  : UInt32 = 0b1000
    static let coin     : UInt32 = 0b10000

这是我用于设置玩家物理体的代码，它是问题物理体之一：

     player.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: player.size.width-40, height: player.size.height-40))
    player.physicsBody?.isDynamic = true
    player.physicsBody?.categoryBitMask = PhysicsCategory.player
    player.physicsBody?.contactTestBitMask = PhysicsCategory.blueball
    player.physicsBody?.contactTestBitMask = PhysicsCategory.redball
    player.physicsBody?.collisionBitMask = PhysicsCategory.None

这是检测碰撞的函数：

  func didBegin(_ contact: SKPhysicsContact) 

    var firstBody: SKPhysicsBody
    var secondBody: SKPhysicsBody
    if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask 
        firstBody = contact.bodyA
        secondBody = contact.bodyB
     else 
        firstBody = contact.bodyB
        secondBody = contact.bodyA
    
    if ((firstBody.categoryBitMask & PhysicsCategory.player != 0) &&
        (secondBody.categoryBitMask & PhysicsCategory.redball != 0)) 
        RedballDidCollideWithPlayer(player: firstBody.node as! SKSpriteNode, redball:  secondBody.node as! SKSpriteNode)
    
    if ((firstBody.categoryBitMask & PhysicsCategory.player != 0) &&
        (secondBody.categoryBitMask & PhysicsCategory.blueball != 0)) 
        BlueballDidCollideWithPlayer(player: firstBody.node as! SKSpriteNode, blueball:  secondBody.node as! SKSpriteNode)
    
    if ((firstBody.categoryBitMask & PhysicsCategory.bounce != 0) &&
        (secondBody.categoryBitMask & PhysicsCategory.redball != 0))
        RedballDidCollideWithBounce(bounce: firstBody.node as! SKSpriteNode, redball: secondBody.node as! SKSpriteNode)
    
    if ((firstBody.categoryBitMask & PhysicsCategory.bounce != 0) &&
        (secondBody.categoryBitMask & PhysicsCategory.blueball != 0)) 
        BlueballDidCollideWithBounce(bounce: firstBody.node as! SKSpriteNode, blueball: secondBody.node as! SKSpriteNode)
    
    if ((firstBody.categoryBitMask & PhysicsCategory.bounce != 0) &&
        (secondBody.categoryBitMask & PhysicsCategory.coin != 0)) 
        coinDidCollideWithplayer(player: firstBody.node as! SKSpriteNode, coin: secondBody.node as! SKSpriteNode)
    
    if ((firstBody.categoryBitMask & PhysicsCategory.player != 0) &&
        (secondBody.categoryBitMask & PhysicsCategory.coin != 0)) 
        coinDidCollideWithplayer(player: firstBody.node as!        SKSpriteNode, coin: secondBody.node as! SKSpriteNode)
    

这是我用于设置 blueball 的代码。这是另一个有问题的物理体：

    let blueball = SKSpriteNode(imageNamed: "blueball")
        blueball.position = enemyb.position
        blueball.physicsBody = SKPhysicsBody(circleOfRadius: blueball.size.width/2)
        blueball.physicsBody?.isDynamic = true
        blueball.physicsBody?.categoryBitMask = PhysicsCategory.blueball
        blueball.physicsBody?.contactTestBitMask = PhysicsCategory.player
        blueball.physicsBody?.contactTestBitMask = PhysicsCategory.bounce
        blueball.physicsBody?.collisionBitMask = PhysicsCategory.None
        blueball.physicsBody?.usesPreciseCollisionDetection = true
        addChild(blueball)
        let actionMove = SKAction.move(to: player.position, duration: 2)

这里的任何想法都会有所帮助。几天来我一直试图找到问题，但没有运气。

【问题讨论】：

注释这行代码然后再试一次，` player.physicsBody?.isDynamic = true`

@Mina 做到了。不会改变任何东西。

为节点、玩家和蓝球评论它，我认为问题是因为 isDynamic 属性。

【参考方案1】：

设置多个类别时，您必须将这些值或组合在一起。你的代码

player.physicsBody?.contactTestBitMask = PhysicsCategory.blueball
player.physicsBody?.contactTestBitMask = PhysicsCategory.redball

只需设置类别两次，第二次覆盖第一次。将其更改为：

player.physicsBody?.contactTestBitMask = PhysicsCategory.blueball | PhysicsCategory.redball