如何检测有关精灵纹理的接触

Question

我有一颗子弹应该被挡住。 Bullet 有 6 种不同的随机纹理来模仿不同的子弹。方块有 3 种随机选择的不同纹理，看起来就像有 3 种不同的方块。我想在代码中指定，如果子弹纹理是红色的，块纹理是红色的，那么分数应该增加，但如果子弹是红色的，块是绿色的，那么游戏就结束了。我真的不知道如何在 didBeginContact 中告诉游戏这样做。

现在我有这个：在 GameScene & didMoveToView 中：

struct PhysicsCategory {
static let None      : UInt32 = 0
static let All       : UInt32 = UInt32.max
static let CgyBlock  : UInt32 = 0b1       
static let Bullet    : UInt32 = 0b10
}

bullet.physicsBody = SKPhysicsBody(texture: bullet.texture, size: self.bullet.size)
bullet.physicsBody?.categoryBitMask = PhysicsCategory.Bullet
bullet.physicsBody?.contactTestBitMask = PhysicsCategory.CgyBlock
bullet.physicsBody?.collisionBitMask = PhysicsCategory.None
bullet.physicsBody?.affectedByGravity = false
bullet.physicsBody?.usesPreciseCollisionDetection = true

在 didBeginContact 中：

func didBeginContact(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.CgyBlock != 0) &&
        (secondBody.categoryBitMask & PhysicsCategory.Bullet != 0)) 
  //and here I suppose I need to implement somehow something like
 // && (bullet.texture = "redBullet") && (CgyBlock.texture = "greenBlock" || "blackBlock")
 {
   gameOver()        
    }

但我知道这行不通。我还尝试在大括号内做一个 switch 语句，但它也没有用。如何实现？

更新： 区块是这样生成的：

var cgyBlock = SKSpriteNode()

let cgyArray = ["cyanBox", "greenBox", "yellowBox"]

func addCgyLine () {
    cgyBlock = SKSpriteNode(imageNamed: "cyanBox")
    var randomCGY = Int(arc4random_uniform(3))
    cgyBlock.texture = SKTexture(imageNamed: cgyArray[randomCGY])

    cgyBlock.physicsBody = SKPhysicsBody(texture: cgyBlock.texture, size: cgyBlock.size)
    cgyBlock.physicsBody?.dynamic = true
    cgyBlock.physicsBody?.categoryBitMask = PhysicsCategory.CgyBlock
    cgyBlock.physicsBody?.contactTestBitMask = PhysicsCategory.Bullet
    cgyBlock.physicsBody?.collisionBitMask = PhysicsCategory.None

    cgyBlock.position = CGPointMake(size.width + cgyBlock.size.width/2, CGRectGetMidY(self.frame) + 60) 
    addChild(cgyBlock)

    let actionMove = SKAction.moveTo(CGPoint(x: -cgyBlock.size.width/2, y: CGRectGetMidY(self.frame) + 60), duration: 3) 
    let actionDone = SKAction.removeFromParent()
    cgyBlock.runAction(SKAction.sequence([actionMove, actionDone]))
    SKActionTimingMode.EaseOut
}

然后我在 didMoveToView 中执行 runAction。

项目符号：

var cannon = SKSpriteNode(imageNamed: "cannon")
var bulletInCannon = SKSpriteNode()
var bullet = SKSpriteNode()

let bulletArray = ["redBullet","magentaBullet", "blueBullet", "cyanBullet", "greenBullet", "yellowBullet"]

//didMoveToView:
 var randomBullet = Int(arc4random_uniform(6))
 bulletInCannon = SKSpriteNode(imageNamed: bulletArray[randomBullet])
 bulletInCannon.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))
 addChild(bulletInCannon)

 //touchesEnded:
var randomBullet = Int(arc4random_uniform(6))
        bullet = SKSpriteNode(texture: bulletInCannon.texture)
        bullet.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))
        bullet.name = bulletArray[randomBullet]
        bullet.physicsBody = SKPhysicsBody(texture: bullet.texture, size: self.bullet.size)
        bullet.physicsBody?.dynamic = true
        bullet.physicsBody?.categoryBitMask = PhysicsCategory.Bullet
        bullet.physicsBody?.contactTestBitMask = PhysicsCategory.CgyBlock
        bullet.physicsBody?.collisionBitMask = PhysicsCategory.None
        bullet.physicsBody?.affectedByGravity = false
        bullet.physicsBody?.usesPreciseCollisionDetection = true

        addChild(bullet)
 bulletInCannon.texture = SKTexture(imageNamed: bulletArray[randomBullet])

Answer 1

首先你需要为子弹和方块定义一个class 然后你可以定义一个 TextureTypes 来存储你的纹理类型（红色，绿色，......）并将你的随机方法生成的任何内容设置到这种类型的 class 变量中。然后你应该管理联系人并找出 BodyA 和 BodyB 的节点是什么。之后很容易根据节点的纹理类型做任何你喜欢的事情，

to clarify the code I have defined Textures as a new Type

enum TextureTypes: String {
    case Red,Green 
    var description:String {
        switch self {
        case Red:return “Red"
        case Green:return “Green”
        case Green:return “Blue"
        }
    }
}

Blockclass and BulletClass both hasto inherit from SKNode cause they are a node!

class BlockClass:SKNode {
    var NodesTexture : TextureTypes = TextureTypes.Red
}

class BulletClass:SKNode {
    var NodesTexture : TextureTypes = TextureTypes.Red
}

write the following codes into your didBeginContact method to detect the TextureType of your Node

    if (contact.bodyA.categoryBitMask == PhysicsCategory.Bullet) &&    
       (contact.bodyB.categoryBitMask == PhysicsCategory.CgyBlock)
    {
        Ablock = (BlockClass *) contact.bodyB.node;
        Abullet = (BulletClass *) contact.bodyA.node;
    }
    if (contact.bodyA.categoryBitMask == PhysicsCategory.CgyBlock) &&    
       (contact.bodyB.categoryBitMask == PhysicsCategory.Bullet)
    {
        Ablock = (BlockClass *) contact.bodyA.node;
        Abullet = (BulletClass *) contact.bodyB.node;
        if ( Ablock.NodesTexture = TextureTypes.Red )
        {
            NSLOG(“A Red Block Detected”)

        }
    }

不要忘记定义 BlocksClass 和 BulletClass 类型的块和项目符号

Answer 2

几条路要走：

您可以使用节点的 userData 属性.

bullet.userData = ["type" : "white"]

要访问它：

println(bullet.userData?["type"])

您可以创建自定义 Bullet class，它是 SKSpriteNode 的子 class，并创建名为 "type" 的属性，并在 didBeginContact 中访问它属性。

class Bullet: SKSpriteNode {

    var type:String = ""


     init(type:String) {
         self.type = type //later you are accessing this with bulletNode.type
        //This is just an simple example to give you a basic idea  what you can do.
        //In real app you should probably implement some kind of security check to avoid wrong type
        let texture = SKTexture(imageNamed: type)

        super.init(texture: texture, color: nil, size: texture.size())
    }

    required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

您也可以使用bullet.name 属性，并在创建时根据bullet/block颜色适当地设置它。稍后在 didBeginContact 中，您将检查 bullet.name 以找出项目符号类型。块也是如此。

func spawnBulletWithType(type:String) -> SKSpriteNode{

     //set texture based on type
     //you can pass here something like white_bullet

     let atlas = SKTextureAtlas(named: "myAtlas")


     //here, if passed white_bullet string, SpriteKit will search for texture called white_bullet.png
     let bullet = SKSpriteNode(texture:atlas.textureNamed(type))


     bullet.name = type // name will be white_bullet, and that is what you will search for in didBeginContact

     bullet.physicsBody = SKPhysicsBody(texture: bullet.texture, size: bullet.size)
     bullet.physicsBody?.categoryBitMask = PhysicsCategory.Bullet
     bullet.physicsBody?.contactTestBitMask = PhysicsCategory.CgyBlock
     bullet.physicsBody?.collisionBitMask = PhysicsCategory.None
     bullet.physicsBody?.affectedByGravity = false
     bullet.physicsBody?.usesPreciseCollisionDetection = true

     return bullet
}

编辑：

根据你最近的评论，你可能会这样做：

let bulletArray = ["redBullet","magentaBullet", "blueBullet", "cyanBullet", "greenBullet", "yellowBullet"]

//didMoveToView:
 var randomBullet = Int(arc4random_uniform(6))
 let bulletType = bulletArray[randomBullet]
 bulletInCannon.name = bulletType
 bulletInCannon = SKSpriteNode(imageNamed: bulletType )
 bulletInCannon.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))
 addChild(bulletInCannon)


//touchesEnded:
var randomBullet = Int(arc4random_uniform(6))
        bullet = SKSpriteNode(texture: bulletInCannon.texture)
        bullet.name = bulletInCannon.name
        bullet.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))

        bullet.physicsBody = SKPhysicsBody(texture: bullet.texture, size: self.bullet.size)
        bullet.physicsBody?.dynamic = true
        bullet.physicsBody?.categoryBitMask = PhysicsCategory.Bullet
        bullet.physicsBody?.contactTestBitMask = PhysicsCategory.CgyBlock
        bullet.physicsBody?.collisionBitMask = PhysicsCategory.None
        bullet.physicsBody?.affectedByGravity = false
        bullet.physicsBody?.usesPreciseCollisionDetection = true

        addChild(bullet)
let bulletType = bulletArray[randomBullet]
 bulletInCannon.texture = SKTexture(imageNamed: bulletType)
 bulletInCannon.name = bulletType

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