Question

我想生成从屏幕顶部掉落的无限数量的节点，只需点击它们即可销毁它们，这很简单，但我遇到了严重的问题。当循环生成节点时，我只能生成一个节点，它开始移动而不是垂直落下。它也会消失并不断出现。这是我的代码，希望你能帮忙。谢谢!!

import SpriteKit

class DestroyScene: SKScene , SKPhysicsContactDelegate{


var velocity:CGFloat = 0
let scoreText = SKLabelNode(fontNamed: "Arial Rounded MT Bold")
var score = 0
var lastYieldTimeInterval:NSTimeInterval = NSTimeInterval()
var lastUpdateTimerInterval:NSTimeInterval = NSTimeInterval()
var gameOver = false


var alien:SKSpriteNode = SKSpriteNode(imageNamed: "circuloAzulArt")

override func didMoveToView(view: SKView) {


    self.physicsWorld.contactDelegate = self
    self.physicsWorld.gravity = CGVectorMake(0, -velocity)
}

func addAlien(){





    var alien:SKSpriteNode = SKSpriteNode(imageNamed: "circuloAzulArt")
    alien.name = "alien"
    alien.physicsBody = SKPhysicsBody(circleOfRadius: alien.size.width/2)
    alien.physicsBody?.dynamic = true
    var actionArray:NSMutableArray = NSMutableArray()
    var actionArray2:NSMutableArray = NSMutableArray()
    alien.removeFromParent()
    if gameOver == false{


        let minX = alien.size.width/2

        let maxX = self.frame.size.width - alien.size.width/2

        let rangeX = maxX - minX


        let position:CGFloat = CGFloat(arc4random()) % CGFloat(rangeX) + CGFloat(minX)

        alien.position = CGPointMake(position, self.frame.size.height + alien.size.height)

            self.addChild(alien)

        let minDuration = 3


        let duration = Int(minDuration)



        actionArray.addObject(SKAction.moveTo(CGPointMake(position, -alien.size.height), duration: NSTimeInterval(duration)))

        actionArray.addObject(SKAction.removeFromParent())

        alien.runAction(SKAction.sequence(actionArray))




    }

}

func updateWithTimeSinceLastUpdate(timeSinceLastUpdate:CFTimeInterval){
    var randomNum = Double(arc4random_uniform(20))
    var xTime = ((randomNum / 20) + 0.25)
    lastYieldTimeInterval += timeSinceLastUpdate
    if (lastYieldTimeInterval > xTime){
        lastYieldTimeInterval = 0
        randomNum = Double(arc4random_uniform(25))
        addAlien()
    }

}

override func update(currentTime: CFTimeInterval) {

    var timeSinceLastUpdate = currentTime - lastUpdateTimerInterval
    lastUpdateTimerInterval = currentTime
    if score < 60{
        velocity = CGFloat(score*3)
    }else{
        velocity = CGFloat(210)
    }

    if (timeSinceLastUpdate > 1){
        timeSinceLastUpdate = 1/60
        lastUpdateTimerInterval = currentTime
    }


    updateWithTimeSinceLastUpdate(timeSinceLastUpdate)

}

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

    for touch: AnyObject in touches {
        let location = touch.locationInNode(self)
        if self.nodeAtPoint(location) == self.alien{

            alien.removeFromParent()
            score++
        }
    }
}

}

Answer 1

每当你添加一个外星人时，你用这行代码删除最后一个外星人： alien.removeFromParent（）

您必须在addAlien（）函数中创建一个新的变量节点，并为该节点命名

例如：

var alien:SKSpriteNode = SKSpriteNode(imageNamed: "alien")
alien.name = "alien"

然后你可以通过检查节点名称

来删除touchesBegan函数中的外星人

let node = self.nodeAtPoint(location)

if (node.name == "alien") {

}

对于引力，您应该将self.physicsWorld.gravity = CGVectorMake(0, -velocity)移动到didMoveToView（）函数并将最后一个参数更改为常量

生成无限量的节点并通过单击它们进行销毁

1 个答案: