ios - 检测 Sprite 之间的碰撞

Question

我的代码有问题。

我正在创建一个游戏，我需要一个可以同时出现多次的 Sprite ，为此我创建了一个类，这样我就可以多次执行 addChild(obstacle) ，并且它将准确地生成一个 SKSpriteNode与另一个类似。

我的问题是，我想检查我的播放器和障碍物之间的碰撞，但因为它来自同一个 SKSpriteNode，所以计算机无法知道我正在谈论哪个障碍物。

以下是我创建玩家和障碍物的方法:

import SpriteKit

class Obstacle: SKSpriteNode {

    init() {
        let obstacleTexture = SKTexture(imageNamed: "obstacle")
        super.init(texture: obstacleTexture, color: UIColor.clearColor(), size: CGSize(width: 80, height: 80))
    }

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

}

class GameScene: SKScene {

    var player:SKSpriteNode!

    override func didMoveToView(view: SKView) {

        //player setup
        let playerTexture = SKTexture(imageNamed: "player")
        player = SKSpriteNode(texture: playerTexture)
        player.position = CGPointMake(self.frame.size.width * 0.5, self.frame.size.height * 0.2)

    }

    //how I spawn an obstacle
    func spawnObstacle() {

        let obstacle = Obstacle()

        //obstacle position setup
        obstacle.position.x = CGFloat(arc4random()) % self.frame.size.width
        obstacle.position.y = self.frame.size.height + 200

        //random spin action setup
        var rotateObstacle = SKAction.rotateByAngle(CGFloat(M_PI), duration: Double((drand48() + 1) * 0.75))

        if random() % 2 == 0 {
            rotateObstacle = SKAction.rotateByAngle(CGFloat(M_PI), duration: Double((drand48() + 1) * 0.75))
        }else{
            rotateObstacle = SKAction.rotateByAngle(-CGFloat(M_PI), duration: Double((drand48() + 1) * 0.75))
        }

        let rotateObstacleForever = SKAction.repeatActionForever(rotateObstacle)

        //random move action setup
        let moveObstacle = SKAction.moveTo(CGPointMake(CGFloat(arc4random()) % self.frame.size.width, -200), duration: Double((drand48() + 1) * 1.5))

        //running the actions
        obstacle.runAction(rotateObstacleForever)
        obstacle.runAction(moveObstacle)

        addChild(obstacle)

    }

}

}

如何检测玩家何时碰撞到任何障碍物？

Answer 1

要检测碰撞，您可以使用 SpriteKit 物理原理。

这里有 3 个与假设碰撞有关的元素:

• 边界(或你的玩家居住的 field 以及你所在的区域)有你的障碍)
• 玩家
• 障碍

建议

将此参数设置为调试阶段以查看物理对象边界:

skView.showsPhysics = true

代码示例(警告:-此代码只是开始实现物理原理的一个点，我不知道您项目的其余部分，因此您的工作将是纠正为您认为这对您的对象更好):

enum CollisionTypes: UInt32 {
    case Field = 1
    case Player = 2
    case Obstacle = 4
}

class GameScene: SKScene, SKPhysicsContactDelegate {
    override func didMoveToView(view: SKView) {
        self.physicsWorld.gravity = CGVectorMake(0, 0) // set your gravity value
        self.physicsWorld.contactDelegate = self
        let fieldBody = SKPhysicsBody.init(edgeLoopFromRect: self.frame)
        self.physicsBody = fieldBody
        self.physicsBody!.affectedByGravity = false
        self.physicsBody!.usesPreciseCollisionDetection = true
        self.physicsBody!.dynamic = true
        self.physicsBody!.mass = 0.8
        self.physicsBody!.friction = 0
        self.physicsBody!.linearDamping = 0
        self.physicsBody!.angularDamping = 0
        self.physicsBody!.restitution = 0
        self.physicsBody!.categoryBitMask = CollisionTypes.Field.rawValue
        self.physicsBody!.contactTestBitMask = CollisionTypes.Player.rawValue

        // Prepare the player 
        player.physicsBody = SKPhysicsBody(circleOfRadius: player.frame.width/2)
        player.physicsBody!.affectedByGravity = false
        player.physicsBody!.restitution = 0.0
        player.physicsBody!.linearDamping = 0
        player.physicsBody!.friction = 0.3
        player.physicsBody!.dynamic = true
        player.physicsBody!.mass = 0.2
        player.physicsBody!.allowsRotation = false
        player.physicsBody!.categoryBitMask = CollisionTypes.Player.rawValue
        player.physicsBody!.contactTestBitMask = CollisionTypes.Field.rawValue | CollisionTypes.Obstacles.rawValue
        player.physicsBody!.collisionBitMask = CollisionTypes.Field.rawValue | CollisionTypes.Obstacles.rawValue

        //Prepare the obstacles (you must do it in your obstacle class)
        obstacle.physicsBody = SKPhysicsBody(circleOfRadius: obstacle.frame.width/2)
        obstacle.physicsBody!.affectedByGravity = false
        obstacle.physicsBody!.restitution = 0.0
        obstacle.physicsBody!.linearDamping = 0
        obstacle.physicsBody!.friction = 0.3
        obstacle.physicsBody!.dynamic = true
        obstacle.physicsBody!.mass = 0.8
        obstacle.physicsBody!.allowsRotation = true
        obstacle.physicsBody!.categoryBitMask = CollisionTypes.Obstacle.rawValue
        obstacle.physicsBody!.contactTestBitMask = CollisionTypes.Player.rawValue
        obstacle.physicsBody!.collisionBitMask = CollisionTypes.Player.rawValue
    }
    func didBeginContact(contact: SKPhysicsContact) {
       if (contact.bodyA.categoryBitMask == CollisionTypes.Player.rawValue &&
        contact.bodyB.categoryBitMask == CollisionTypes.Obstacle.rawValue) {
        print("contact between Player and Obstacle")
       }
       if (contact.bodyA.categoryBitMask == CollisionTypes.Player.rawValue &&
        contact.bodyB.categoryBitMask == CollisionTypes.Field.rawValue) {
        print("contact between Player and Field")
       }
    }
 }