ios - SpriteKit + Swift - 接触时不触发

Question

所以我正在玩弄 Swift 和 SpriteKit。我决定创建一个简单的游戏，其中一个角色将走到硬币箱并获得所有宝藏。

我正在尝试检测两个物体何时相互接触，但似乎什么也没有发生。

我做了什么:

1) 我设置委托(delegate):

SKPhysicsContactDelegate

2) 创建场景:

override func didMoveToView(view: SKView) {

    backgroundColor = SKColor.whiteColor()
    physicsWorld.contactDelegate = self

    let sceneBody = SKPhysicsBody(edgeLoopFromRect: self.frame)
    sceneBody.friction = 0

    background.zPosition = -20
    background.anchorPoint = CGPointZero
    background.position = CGPointZero

    backgroundRepeated.zPosition = -20
    backgroundRepeated.anchorPoint = CGPointZero
    backgroundRepeated.position = CGPointMake(background.size.width-1,0)


    addChest()
    addCharacter()

    addChild(background)
    addChild(backgroundRepeated)


}

3) 创建项目:

func addChest() {
    chestOfCoins.anchorPoint = CGPointZero
    chestOfCoins.size = CGSize(width: 200,height: 200)
    chestOfCoins.position = CGPoint(x: self.frame.width-1, y: 300)
    chestOfCoins.zPosition = 20
    chestOfCoins.physicsBody = SKPhysicsBody(rectangleOfSize: chestOfCoins.size)
    chestOfCoins.physicsBody?.affectedByGravity = false
    chestOfCoins.physicsBody?.dynamic = false
    chestOfCoins.physicsBody?.categoryBitMask = physicsCategory.chests
    chestOfCoins.physicsBody?.collisionBitMask = 0
    chestOfCoins.physicsBody?.contactTestBitMask = physicsCategory.character

    addChild(chestOfCoins)
}

func addCharacter() {
    character.anchorPoint = CGPointZero
    character.position = CGPoint(x: 300, y: 300)
    character.zPosition = 20
    character.size = CGSize(width: 200, height: 200)
    character.physicsBody = SKPhysicsBody(rectangleOfSize: character.size)
    character.physicsBody?.affectedByGravity = false
    character.physicsBody?.dynamic = false
    character.physicsBody?.categoryBitMask = physicsCategory.character
    character.physicsBody?.contactTestBitMask = physicsCategory.chests
    character.physicsBody?.collisionBitMask = 0


    addChild(character)
}

4) 创建了 didBeginContact:

func didBeginContact(contact: SKPhysicsContact) {
    var contactBody1: SKPhysicsBody
    var contactBody2: SKPhysicsBody

    if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
        contactBody1 = contact.bodyA
        contactBody2 = contact.bodyB

    } else {
        contactBody1 = contact.bodyB
        contactBody2 = contact.bodyA
    }

    if((contactBody1.categoryBitMask == 1) && (contactBody2.categoryBitMask == 2)) {
        print("touched")
    } else {
        print("not these two")
    }
}

FYI, this IF if((contactBody1.categoryBitMask == 1) && (contactBody2.categoryBitMask == 2)) does not output Either the main if block or the else.

5) 我创建了物理类别:

struct physicsCategory {
  static let none: UInt32 = 0 //0
  static let character: UInt32 = 0b1 //1
  static let chests: UInt32 = 0b10 //2
  static let snake: UInt32 = 0b100 //4
}

完整的 GameScene.Swift:

import SpriteKit

class GameScene: SKScene, SKPhysicsContactDelegate {

struct physicsCategory {
    static let none: UInt32 = 0 //0
    static let character: UInt32 = 0b1 //1
    static let chests: UInt32 = 0b10 //2
    static let snake: UInt32 = 0b100 //4
    static let all: UInt32 = UInt32.max
}


let background = SKSpriteNode(imageNamed: "Backgrounds")
let backgroundRepeated = SKSpriteNode(imageNamed: "Backgrounds")
let chestOfCoins = SKSpriteNode(imageNamed: "chest")
let character = SKSpriteNode(imageNamed: "character")

let gameActions = NSUserDefaults.standardUserDefaults()

func addChest() {
    chestOfCoins.anchorPoint = CGPointZero
    chestOfCoins.size = CGSize(width: 200,height: 200)
    chestOfCoins.position = CGPoint(x: self.frame.width-1, y: 300)
    chestOfCoins.zPosition = 20
    chestOfCoins.physicsBody = SKPhysicsBody(rectangleOfSize: chestOfCoins.size)
    chestOfCoins.physicsBody?.affectedByGravity = false
    chestOfCoins.physicsBody?.dynamic = false
    chestOfCoins.physicsBody?.categoryBitMask = physicsCategory.chests
    chestOfCoins.physicsBody?.collisionBitMask = 0
    chestOfCoins.physicsBody?.contactTestBitMask = physicsCategory.character

    addChild(chestOfCoins)
}

func addCharacter() {
    character.anchorPoint = CGPointZero
    character.position = CGPoint(x: 300, y: 300)
    character.zPosition = 20
    character.size = CGSize(width: 200, height: 200)
    character.physicsBody = SKPhysicsBody(rectangleOfSize: character.size)
    character.physicsBody?.affectedByGravity = false
    character.physicsBody?.dynamic = false
    character.physicsBody?.categoryBitMask = physicsCategory.character
    character.physicsBody?.contactTestBitMask = physicsCategory.chests
    character.physicsBody?.collisionBitMask = 0


    addChild(character)
}

override func didMoveToView(view: SKView) {

    backgroundColor = SKColor.whiteColor()
    physicsWorld.contactDelegate = self

    let sceneBody = SKPhysicsBody(edgeLoopFromRect: self.frame)
    sceneBody.friction = 0

    background.zPosition = -20
    background.anchorPoint = CGPointZero
    background.position = CGPointZero

    backgroundRepeated.zPosition = -20
    backgroundRepeated.anchorPoint = CGPointZero
    backgroundRepeated.position = CGPointMake(background.size.width-1,0)


    addChest()
    addCharacter()

    addChild(background)
    addChild(backgroundRepeated)


}

func didBeginContact(contact: SKPhysicsContact) {
    var contactBody1: SKPhysicsBody
    var contactBody2: SKPhysicsBody

    if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
        contactBody1 = contact.bodyA
        contactBody2 = contact.bodyB

    } else {
        contactBody1 = contact.bodyB
        contactBody2 = contact.bodyA
    }

    if((contactBody1.categoryBitMask == 1) && (contactBody2.categoryBitMask == 2)) {
        print("touched")
    } else {
        print("not these two")
    }
}

override func update(currentTime: NSTimeInterval) {

    let startWalking = gameActions.boolForKey("Walking")

    if (startWalking == true) {


        chestOfCoins.position = CGPoint(x: chestOfCoins.position.x - 5, y: chestOfCoins.position.y)

        background.position = CGPoint(x: background.position.x - 5, y: background.position.y)
        backgroundRepeated.position = CGPoint(x: backgroundRepeated.position.x - 5, y: backgroundRepeated.position.y)

        if (background.position.x < -background.size.width) {
            background.position = CGPointMake(backgroundRepeated.position.x + backgroundRepeated.size.width, background.position.y)
        }

        if (backgroundRepeated.position.x < -backgroundRepeated.size.width) {
            backgroundRepeated.position = CGPointMake(background.position.x + background.size.width, backgroundRepeated.position.y)
        }
    }
}

}

问题

谁能告诉我为什么当屏幕开始滚动并且这两个项目接触时没有任何反应并告诉我如何解决它？

即使我将两者的 zPosition 设置为相同，一个似乎也落后了

这是一张照片，不要判断图像:(

Answer 1

将你的箱子或其他元素属性设置为 dynamic = true

两个非动态物理体不会注册联系