雪碧包玩家与敌人的碰撞

Question

我一直在四处寻找如何让我的玩家和敌人发生碰撞。我设置了一个攻击按钮，这样当按下按钮时，玩家前面的敌人就会从屏幕上移走。我如何设置碰撞，如何让它只在按钮被按下时进行碰撞？

我已经尝试使用这个代码来处理碰撞，但我不认为它有任何效果。

//physicsbody for player and enemies
func didBegin(_ contact: SKPhysicsContact) {
    var bodyA = SKPhysicsBody()
    var bodyB = SKPhysicsBody()

    if contact.bodyA.node?.name == "player" {
        bodyA = contact.bodyA
        bodyB = contact.bodyB
    } else  {
        bodyA = contact.bodyB
        bodyB = contact.bodyA
    }
    //Player hits the rocket and dies and also remove the rocket
    if bodyA.node?.name == "player" && bodyB.node?.name == "enemy" {
        bodyA.node?.removeFromParent()
        bodyB.node?.removeFromParent()


        //After player dies go to death scene
        let gameOver = GameOverScene(size:CGSize(width: 2048, height: 1536), won:  false)
        self.view?.presentScene(gameOver)

    }

}

然后这就是玩家：

 func createPlayer(_ position: CGPoint) { //This is the method that creates the player on screen. You must pass this method the position you want the sprite spawned. Or maybe you can do it somewhere else in Swift, I dunno.

    //graphic stuff
    //let playerTexture = SKTexture(imageNamed: "Ttam1") //create variable with graphic assigned to it
    let player = SKSpriteNode(texture: playerTexture) //give player the graphic
    player.size = CGSize(width: 175, height: 200) //player sprite size
    player.zPosition = 20
    player.name = "player"
    //physics stuff
    player.physicsBody = SKPhysicsBody(texture: playerTexture, size: player.size) //Set up pixel-perfect collision mesh for the player
    player.physicsBody?.isDynamic = true
    player.physicsBody!.affectedByGravity = true //Stop the player from being affected by gravity
    player.physicsBody?.allowsRotation = false
    player.physicsBody?.categoryBitMask = ColliderType.PLAYER


    //spawny stuff
    insertChild(player, at: 0) //spawn player
    player.position = position //move player to position passed into this method
    playerNode = player //Create a node where the player is, filled by the player itself... Like a D.Va ult! The call mech one, not the self-destruct one.
    /*
    let frame2 = SKTexture(imageNamed: "Ttam2")
    let frame3 = SKTexture(imageNamed: "Ttam3")
    let frame4 = SKTexture(imageNamed: "Ttam4")

    */
    let animation = SKAction.animate(with: [playerTexture, frame2, frame3, frame4], timePerFrame: 0.2)
    let runForever = SKAction.repeatForever(animation)

    player.run(runForever)

}

这是我们的敌人：

//Create enemy - slime
func spawnEnemy() {

    //Call the enemy variable and sprite
    let enemyTexture = SKTexture(imageNamed: "Slime1")
    let enemy = SKSpriteNode(texture: enemyTexture)
    enemy.size = CGSize(width: 175, height: 175)
    enemy.zPosition = 10
    //Collision with the enemy
    enemy.name = "enemy"
    enemyNode = enemy

    //Randomly place the enemy on screen and move
    enemy.position = CGPoint(x: 2100, y: 325)
    enemy.physicsBody? = SKPhysicsBody(texture: enemyTexture, size: enemy.size)
    enemy.physicsBody?.affectedByGravity = true
    enemy.physicsBody?.allowsRotation = false
    enemy.physicsBody?.isDynamic = true




    //Add enemy node to screen.
    addChild(enemy)

    let frame2 = SKTexture(imageNamed: "Slime2")
    let frame3 = SKTexture(imageNamed: "Slime3")
    let animation = SKAction.animate(with: [enemyTexture, frame2, frame3, frame2], timePerFrame: 0.2)
    let runForever = SKAction.repeatForever(animation)

    enemy.run(runForever)



    //Set the enemy to move in a single direction:
    let actionMove = SKAction.moveTo(x: -enemy.size.width/2, duration: 10.0)

    //Remove enemy from screen when action is complete:
    let actionRemove = SKAction.removeFromParent()
    enemy.run(SKAction.sequence([actionMove, actionRemove]))

}

Answer 1

要让攻击按钮摧毁敌人，请执行touchesBegan，如果按下了攻击按钮，则设置一个标志：

attacking = true

(首先在特性定义中定义attacking：var attacking = false )

在touchesEnded中，如果在attck按钮上的触摸结束，则设置attacking = false。

然后，在你的didBegin中，只有在没有设置攻击标志的情况下才能销毁玩家。如果设置好了(即玩家在按下攻击按钮的同时与粘液发生碰撞)，则只销毁粘液，添加一些分数等。

//Player hits the rocket and dies and also remove the rocket
if bodyA.node?.name == "player" && bodyB.node?.name == "enemy" {    
    switch attacking {
    case false:
        bodyA.node?.removeFromParent()
        bodyB.node?.removeFromParent()

        //After player dies go to death scene
        let gameOver = GameOverScene(size:CGSize(width: 2048, height: 1536), won:  false)
        self.view?.presentScene(gameOver)
    case true:
        let enemy = contact.bodyA.categoryBitMask == ColliderType.ENEMY ? contact.bodyA.node : contact.bodyB.node
        enemy.removeFromParent()
        score += 1
    }
}

我假设你评论中的‘火箭’是敌人的节点，它是粘液？:-)我没有看到为敌人设置的categoryBitMask -有吗？我以为是ColliderType.ENEMY

didBegin:中的这段代码是多余的：

var bodyA = SKPhysicsBody()
var bodyB = SKPhysicsBody()
if contact.bodyA.node?.name == "player" {
    bodyA = contact.bodyA
    bodyB = contact.bodyB
} else  {
    bodyA = contact.bodyB
    bodyB = contact.bodyA
}

因为您从来没有使用过您设置的bodyA和bodyB变量。如果您以后确实使用它们，那么这可能更有意义：

if contact.bodyA.node?.name == "player" {
    player = contact.bodyA
    enemy = contact.bodyB
} else  {
    enemy = contact.bodyB
    player = contact.bodyA
}

然后是下面这行代码：

        let enemy = contact.bodyA.categoryBitMask == ColliderType.ENEMY ? contact.bodyA.node : contact.bodyB.node

可以从case true:块中删除。