我试图制作一个游戏，让蠕虫在屏幕上移动并在每次触摸时旋转并吃掉苹果。我在编码蠕虫和Apple之间的碰撞检测时遇到了困难。我想要它，以便当蠕虫进入Apple的顶部时，Apple节点随机生成其他地方。
这是我的代码：
//
// GameScene.swift
// Final Project
//
// Created by Adam Hackett on 2015-10-22.
// Copyright (c) 2015 Adam Hackett. All rights reserved.
//
import SpriteKit
import AVFoundation
var movingDirection = "left"
let worm = SKSpriteNode(imageNamed: "worm")
let apple = SKSpriteNode(imageNamed: "Apple")
// vector helper operations
func + (left: CGPoint, right: CGPoint) -> CGPoint {
return CGPoint(x: left.x + right.x, y: left.y + right.y)
}
func - (left: CGPoint, right: CGPoint) -> CGPoint {
return CGPoint(x: left.x - right.x, y: left.y - right.y)
}
func * (point: CGPoint, scalar: CGFloat) -> CGPoint {
return CGPoint(x: point.x * scalar, y: point.y * scalar)
}
func / (point: CGPoint, scalar: CGFloat) -> CGPoint {
return CGPoint(x: point.x / scalar, y: point.y / scalar)
}
#if !(arch(x86_64) || arch(arm64))
func sqrt(a: CGFloat) -> CGFloat {
return CGFloat(sqrtf(Float(a)))
}
#endif
extension CGPoint {
func length() -> CGFloat {
return sqrt(x*x + y*y)
}
func normalized() -> CGPoint {
return self / length()
}
}
struct PhysicsCategory {
static let None : UInt32 = 0
static let All : UInt32 = UInt32.max
static let Apple : UInt32 = 0b1 // 1
static let Worm: UInt32 = 0b10 // 2
}
class GameScene: SKScene, SKPhysicsContactDelegate {
override func didMoveToView(view: SKView) {
backgroundColor = SKColor.whiteColor()
//----------------APPLE START-----------------//
let sizeX = UInt32(CGRectGetMaxX(self.frame))
let randomX = CGFloat(arc4random_uniform(sizeX))
let sizeY = UInt32(CGRectGetMaxY(self.frame))
let randomY = CGFloat(arc4random_uniform(sizeY))
apple.position = CGPointMake(randomX, randomY)
addChild(apple)
let appleCategory: UInt32 = 0x1 << 0
//------------APPLE FINISH--------------------//
//------------------WORM START---------------//
worm.position = CGPointMake(self.size.width/2, self.size.height/2)
self.addChild(worm)
let wormCategory: UInt32 = 0x1 << 1
//-----------------WORM FINISH---------------//
//PHYSICS
physicsWorld.gravity = CGVectorMake(0, 0)
physicsWorld.contactDelegate = self
worm.physicsBody = SKPhysicsBody(circleOfRadius: worm.size.width/2)
worm.physicsBody?.dynamic = true
worm.physicsBody?.categoryBitMask = PhysicsCategory.Worm
worm.physicsBody?.contactTestBitMask = PhysicsCategory.Apple
worm.physicsBody?.collisionBitMask = PhysicsCategory.None
worm.physicsBody?.usesPreciseCollisionDetection = true
apple.physicsBody = SKPhysicsBody(rectangleOfSize: apple.size) // 1
apple.physicsBody?.dynamic = true // 2
apple.physicsBody?.categoryBitMask = PhysicsCategory.Apple // 3
apple.physicsBody?.contactTestBitMask = PhysicsCategory.Worm // 4
apple.physicsBody?.collisionBitMask = PhysicsCategory.None // 5
func projectileDidCollideWithMonster(worm:SKSpriteNode, apple:SKSpriteNode) {
print("Hit")
apple.removeFromParent()
}
func didBeginContact(contact: SKPhysicsContact) {
// 1
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
}
// 2
if ((firstBody.categoryBitMask & PhysicsCategory.Worm != 0) &&
(secondBody.categoryBitMask & PhysicsCategory.Apple != 0)) {
projectileDidCollideWithMonster(firstBody.node as! SKSpriteNode, apple: secondBody.node as! SKSpriteNode)
}
}
}
func random() -> CGFloat {
return CGFloat(Float(arc4random()) / 0xFFFFFFFF)
}
func random(min min: CGFloat, max: CGFloat) -> CGFloat {
return random() * (max - min) + min
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
/* Called when a touch begins */
// change the direction the object should move
if (movingDirection == "left") {
movingDirection = "down"
}
else if (movingDirection == "down") {
movingDirection = "right"
}
else if (movingDirection == "right") {
movingDirection = "up"
}
else if (movingDirection == "up") {
movingDirection = "left"
}
print(movingDirection)
let rotateWorm = SKAction.rotateByAngle(CGFloat(M_PI_2), duration:0.0)
worm.runAction(rotateWorm)
}
override func update(currentTime: NSTimeInterval) {
/* Called before each frame is rendered */
// need to set it to something for the sequence below
// so setting it to a nothing action
var moveWorm:SKAction = SKAction.moveByX(0.0, y: 0.0, duration: 0.0)
// change the direction the object should move
if (movingDirection == "left") {
moveWorm = SKAction.moveByX(-1.0, y: 0.0, duration: 0.01)
}
else if (movingDirection == "down") {
moveWorm = SKAction.moveByX(0.0, y: -1.0, duration: 0.01)
}
else if (movingDirection == "right") {
moveWorm = SKAction.moveByX(1.0, y: 0.0, duration: 0.01)
}
else if (movingDirection == "up") {
moveWorm = SKAction.moveByX(0.0, y: 1.0, duration: 0.01)
}
worm.runAction(moveWorm)
if (worm.position.x < -worm.size.width/2.0 || worm.position.x > self.size.width+worm.size.width/2.0
|| worm.position.y < -worm.size.height/2.0 || worm.position.y > self.size.height+worm.size.height/2.0)
{
let reveal = SKTransition.flipHorizontalWithDuration(0.5)
let gameOverScene = GameOver(size: self.size, won: false)
self.view?.presentScene(gameOverScene, transition: reveal)
}
}
}
答案 0 :(得分：0)
你究竟有什么问题？你需要给你的蠕虫和苹果一个物理身体，而不是检查接触碰撞。一旦发生碰撞，重新生成蠕虫。
你可以阅读这应该有用的内容 http://www.techotopia.com/index.php/A_Swift_iOS_8_Sprite_Kit_Collision_Handling_Tutorial