swift - 如何让玩家在 Swift 中只跳一次？

Question

我想知道如何让玩家只跳跃一次直到落地，就像大多数游戏一样。我试过这个: swift - Jump only when landed ，但它对我来说并没有真正起作用，因为无论出于什么原因，玩家只有在我大量点击屏幕时才会跳跃，而他只会每点击 30 次就会跳跃一次。其外观如下:

它位于:类 GameScene: SkScene {

var ableToJump = true
var Player = SKSpriteNode(imageNamed: "Spieler_rechts")

在:didMoveToView(view: SKView)

Player.position = CGPoint(x: self.frame.size.width*0.1, y: Ground.frame.size.height + Player.frame.size.height)
Player.zPosition = 3
Player.physicsBody = SKPhysicsBody(rectangleOfSize: Player.size)
Player.physicsBody?.allowsRotation = false
Player.physicsBody?.affectedByGravity = true
Player.physicsBody?.restitution = 0
self.addChild(Player)

中:override func update(currentTime: NSTimeInterval)

if Player.physicsBody?.velocity.dy == 0 {
    ableToJump = true
}
else {
    ableToJump = false
}

中:override func TouchesBegan(touches: Set, withEvent event: UIEvent?)

if ableToJump == true {
    Player.physicsBody?.applyImpulse(CGVectorMake(0, 20))
}

Answer 1

我是这样做的:

编辑:

    class MainScene: SKScene, SKPhysicsContactDelegate {

        let colorChanger = ColorChanger()
        let ground = SKSpriteNode(imageNamed: "Ground")
        let player = SKSpriteNode(imageNamed: "Player")
        let block1 = SKSpriteNode(imageNamed: "Block2")
        let block2 = SKSpriteNode(imageNamed: "Block2")
        let scoreLabel = SKLabelNode(fontNamed: "Chalkboard SE")
        let highScoreLabel = SKLabelNode(fontNamed: "Chalkboard SE")
        let life = SKSpriteNode(imageNamed: "Player")
        let life2 = SKSpriteNode(imageNamed: "Player")
        let life3 = SKSpriteNode(imageNamed: "Player")
        var firstTime = Int()

        var blockMaxX = CGFloat(0)
        var origBlockPositionX = CGFloat(0)
        var score = Int()
        var highScore = Int()
        var lives = Int()

        var groundPositionX = CGFloat(0)
        var maxBarX = CGFloat(0)
        var groundSpeed = 5
        var playerBaseLine = CGFloat(0)
        var more = CGFloat(0)

        var onGround = true
        var velocityY = CGFloat(0)
        let gravity = CGFloat(1.3)

        enum Collision:UInt32{
            case Player = 1
            case Block = 2
        }



override func didMoveToView(view: SKView) {
self.physicsWorld.contactDelegate = self
        let color1 = colorChanger.randomColor()
        runAction(SKAction.colorizeWithColor(color1, colorBlendFactor: 1, duration: 0.2))
        self.ground.anchorPoint = CGPointMake(0, 1)
        self.ground.position = CGPointMake(CGRectGetMinX(self.frame),CGRectGetMidY(self.frame)-23)
        self.ground.size = CGSize(width: 1100, height: 4000)

        self.groundPositionX = self.ground.position.x
        self.maxBarX = self.ground.size.width - self.frame.size.width - 100
        self.maxBarX *= -1

        self.player.size = CGSize(width: 50, height: 50)
        self.playerBaseLine = self.frame.height / 2
        self.player.position = CGPointMake(CGRectGetMinX(self.frame) + self.player.size.width / 1.5 , self.playerBaseLine)
        self.player.physicsBody = SKPhysicsBody(circleOfRadius: CGFloat(self.player.size.width / 2))
        self.player.physicsBody!.affectedByGravity = false
        self.player.physicsBody!.categoryBitMask = Collision.Player.rawValue
        self.player.physicsBody!.contactTestBitMask = Collision.Block.rawValue
        self.player.physicsBody!.collisionBitMask = Collision.Block.rawValue

override func update(currentTime: NSTimeInterval) {

            self.velocityY  += self.gravity
            self.player.position.y -= velocityY

            if self.player.position.y < self.playerBaseLine {
                self.player.position.y = self.playerBaseLine
                velocityY = 0.0
                onGround = true
            }
    }

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
            if self.onGround{
                self.velocityY = -18.0
                self.onGround = false
            }
    }

你需要利用重力；)