Question

我有这个代码，我正在尝试编写游戏。当屏幕右侧有一个水龙头时，我希望汽车在一条车道右转，当屏幕左侧有一个水龙头时，我想要离开一条车道。我写了一个移动汽车的功能，但我不知道如何让它工作。这是我的代码：

 //
 //  GameScene.swift
 //  cargame
 //
 //  Created by Pranav Sharan on 3/21/17.
 //  Copyright © 2017 Pranav Sharan. All rights reserved.
 //

 import SpriteKit
 import GameplayKit

class GameScene: SKScene {



override func didMove(to view: SKView) {
    let player:SKSpriteNode = self.childNode(withName: "car") as! SKSpriteNode
}


func touchDown(atPoint pos : CGPoint) {
}

func touchMoved(toPoint pos : CGPoint) {

}

func touchUp(atPoint pos : CGPoint) {

}

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first {
        let position = touch.location(in: self)
        print(position.x)
        print(position.y)
        if position.x < 0 {
            moveLeft(object: player)
        }
    }
}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
    for t in touches { self.touchMoved(toPoint: t.location(in: self)) }
}

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    for t in touches { self.touchUp(atPoint: t.location(in: self)) }
}

override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
    for t in touches { self.touchUp(atPoint: t.location(in: self)) }
}


override func update(_ currentTime: TimeInterval) {
    // Called before each frame is rendered
}




func moveLeft(object: SKSpriteNode){
    let move = SKAction.moveTo(x: -20, duration: 0.5)
    object.run(move)
}

}

Answer 1

以下是一个如何完成此操作的示例，希望它有所帮助。

     class GameScene: SKScene {

var player = SKSpriteNode()
override func didMove(to view: SKView) {

    player = SKSpriteNode(color: .purple, size: CGSize(width: 100, height: 100))
    player.position = CGPoint(x: self.frame.midX, y: self.frame.midY)
    self.addChild(player)

       }


func touchDown(atPoint position : CGPoint) {

    if position.x < self.frame.midX
    {
        let move = SKAction.moveTo(x: self.frame.minX + 200, duration: 0.3)
        player.run(move)

    } else if position.x > self.frame.midX {
    let move = SKAction.moveTo(x: self.frame.maxX - 200, duration: 0.3)
    player.run(move)
    }
}

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

    for t in touches { self.touchDown(atPoint: t.location(in: self)) }
}
}

如果触摸小于屏幕中间，则屏幕中间由self.frame.midX定义。

Answer 2

我看到的第一件事是你在didMove（）函数中声明你的玩家节点，这使得它在该函数范围之外不可见。

将玩家节点声明为GameScene类的属性，以使其在课堂内外的任何地方都可用。然后，将场景对象分配给它。你的代码更像是这样：

class GameScene: SKScene {

var player:SKSpriteNode

override func didMove(to view: SKView) {
     self.player = self.childNode(withName: "car") as! SKSpriteNode
}

如何在Sprite Kit中移动对象？

2 个答案: