實現碰撞檢測

Question

基本上，遊戲由玩家在屏幕上移動的籃子組成，遊戲的目的是讓玩家捕捉從屏幕頂部落下的球。我目前正試圖在球和籃子之間增加碰撞檢測，但是我們面臨的困難是實施這種碰撞檢測。我對swift，sprite kit和app開發很陌生，所以請幫助。任何幫助，將不勝感激。我面臨的另一個問題是所有的球落在屏幕的中心。一行代碼應該執行的時候，球擊中籃，然後球應該消失，請幫助，因爲我是Spritekit的新手。

import SpriteKit 

class GameScene: SKScene { 

var basket = SKSpriteNode() 

let actionMoveRight = SKAction.moveByX(50, y: 0, duration: 0.2) 
let actionMoveLeft = SKAction.moveByX(-50, y: 0, duration: 0.2) 
//let physicsBody = SKPhysicsBody(texture: , size: 3500) 

override func didMoveToView(view: SKView) { 
    /* Setup your scene here */ 

    self.physicsWorld.gravity = CGVectorMake(0.0, -0.5) 
    self.backgroundColor = SKColor.whiteColor() 
    basket = SKSpriteNode(imageNamed: "basket") 
    basket.setScale(0.5) 
    basket.position = CGPointMake(self.size.width/2, self.size.height/8) 
    basket.size.height = 50 
    basket.size.width = 75 
    self.addChild(basket) 

    let updateAction = SKAction.runBlock { 



     var choice = arc4random_uniform(3) 

     switch choice { 
     case 1 : 
      var ball1 = SKSpriteNode(imageNamed: "redBall") 
      ball1.position = CGPointMake(self.size.width/3, self.size.height) 
      ball1.setScale(0.5) 
      ball1.size.height = 20 
      ball1.size.width = 30 
      ball1.physicsBody = SKPhysicsBody(circleOfRadius: ball1.size.height/2.75) 
      ball1.physicsBody!.dynamic = true 
      self.addChild(ball1) 
      println("0") 


     case 0 : 
      var ball2 = SKSpriteNode(imageNamed: "redBall") 
      ball2.position = CGPointMake(self.size.width/5, self.size.height) 
      ball2.setScale(0.5) 
      ball2.size.height = 20 
      ball2.size.width = 30 
      ball2.physicsBody = SKPhysicsBody(circleOfRadius: ball2.size.height/2.75) 
      ball2.physicsBody!.dynamic = true 
      self.addChild(ball2) 
      println("1") 


     case 2 : 
      var ball3 = SKSpriteNode(imageNamed: "redBall") 
      ball3.position = CGPointMake(self.size.width*4/5, self.size.height) 
      ball3.setScale(0.5) 
      ball3.size.height = 20 
      ball3.size.width = 30 
      ball3.physicsBody = SKPhysicsBody(circleOfRadius: ball3.size.height/2.75) 
      ball3.physicsBody!.dynamic = true 
      self.addChild(ball3) 
      println("2") 


     default : 
      println("Problem") 

     } 



    } 

    let waitDuration : NSTimeInterval = 1.0 
    let updateAndWaitAction = SKAction.sequence([updateAction,SKAction.waitForDuration(waitDuration)]) 
    let repeatForeverAction = SKAction.repeatActionForever(updateAndWaitAction) 
    self.runAction(repeatForeverAction) 
} 

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) { 
    /* Called when a touch begins */ 

    for touch: AnyObject in touches { 
     let location = touch.locationInNode(self) 
     if location.x > basket.position.x { 
      if basket.position.x < self.frame.maxX { 
       basket.runAction(actionMoveRight) 
      } 
     } 
     else { 
      if basket.position.x > self.frame.minX { 
       basket.runAction(actionMoveLeft) 
      } 
     } 
    } 
} 

override func update(currentTime: CFTimeInterval) { 


} 

}

Answer 1

現在你有一個通常在用戶被錄音的東西的情況下使用的代碼。您需要使用BodyA & BodyB併爲您的節點分配一個位掩碼。

self.basket.physicsBody?.categoryBitMask = ColliderType.basket.rawValue 
self.basket.physicsBody?.contactTestBitMask = ColliderType.ball1.rawValue 
self.basket.physicsBody?.collisionBitMask = ColliderType.ball1.rawValue 
self.basket.physicsBody?.contactTestBitMask = ColliderType.ball2.rawValue 
self.basket.physicsBody?.collisionBitMask = ColliderType.ball2.rawValue 
self.basket.physicsBody?.contactTestBitMask = ColliderType.ball3.rawValue 
self.basket.physicsBody?.collisionBitMask = ColliderType.ball3.rawValue 

並且爲每個球也做。然後在FUNC didBeginContact你應該說Xcode的做什麼，如果你有一個動畫或東西：

if (contact.bodyA.categoryBitMask == ColliderType.ball1.rawValue || contact.bodyB.categoryBitMask == ColliderType.ball1.rawValue) { 
     yourGameOverFunc() 
    } 
    if (contact.bodyA.categoryBitMask == ColliderType.ball2.rawValue || contact.bodyB.categoryBitMask == ColliderType.ball2.rawValue) { 
     yourGameOverFunc() 
    } 
    if (contact.bodyA.categoryBitMask == ColliderType.ball3.rawValue || contact.bodyB.categoryBitMask == ColliderType.ball3.rawValue) { 
     yourGameOverFunc() 
    }