Swift 3.0中可玩的游戏区域

Question

我正在为mac创建一个mario克隆，以帮助我学习快速编程。我碰到的一个问题是设置一个可玩的游戏区域。到目前为止，当按下左键或右键时，我有两个背景（“背景”和“水平”）会移动，但两侧的灰色区域将变为可见。我希望能够使背景移动，但设置一个区域，他们将停止移动。

import SpriteKit 

class GameScene: SKScene { 

    let player = SKSpriteNode(imageNamed: "mario") 

    let background = SKSpriteNode(imageNamed: "background") 

    let level = SKSpriteNode(imageNamed: "level") 

    override func didMove(to view: SKView) { 
     /* Setup your scene here */ 

     //self.physicsBody = SKPhysicsBody(edgeLoopFromRect: self.frame) 

     level.size = self.size 
     level.position = CGPoint(x: self.size.width/2, y: self.size.height/2) 
     level.zPosition = 1 
     self.addChild(level) 

     background.size = self.size 
     background.position = CGPoint(x: level.size.width + 511, y: self.size.height/2) 
     background.zPosition = 0 
     self.addChild(background) 

     player.setScale(0.23) 
     player.position = CGPoint(x: self.size.width/8, y: 120) 
     player.zPosition = 2 
     self.addChild(player) 

    } 

    override func keyDown(with theEvent: NSEvent) { 
     let keyCode = theEvent.keyCode 

     //Moving Right 
     if keyCode == 124 { 
      level.run(SKAction.sequence([SKAction.moveBy(x: -20, y: 0, duration: 0.2)])) 

      background.run(SKAction.sequence([SKAction.moveBy(x: -20, y: 0, duration: 0.2)])) 

      player.xScale = 0.23 
     } 

     //Moving Left 
     if keyCode == 123 { 
      background.run(SKAction.sequence([SKAction.moveBy(x: 20, y: 0, duration: 0.2)])) 

      level.run(SKAction.sequence([SKAction.moveBy(x: 20, y: 0, duration: 0.2)])) 

      player.xScale = -0.23   
     } 

     //Jump 
     if keyCode == 126{    
      player.run(SKAction.sequence([SKAction.moveTo(y: 250, duration: 0.15),SKAction.moveTo(y: 120, duration: 0.2)])) 
     } 
    }  
} 

Answer 1

我敢肯定有一个更好，更聪明的解决方案，但是从我的头顶，你可以添加：

let LEFTBOUND: Int = //Insert the left limit here. 
let RIGHTBOUND: Int = //Insert the right limit here. 

里面func keyDown()，在移动左/右如果 - 语句，这些窝：

if level.position.x < RIGHTBOUND: 
    //Move level so long as it is less than the RIGHTBOUND value. 
    //TODO: set the level.position to RIGHTBOUND so it doesn't keep updating with new values while keyDown is true. 

if level.position.x > LEFTBOUND: 
    //Move level so long as it is greater than the LEFTBOUND value. 
    //TODO: set the level.position to LEFTBOUND so it doesn't keep updating with new values while the keyDown is true. 

//Repeat theses steps for background.position.x 

你也应该限制球员的跑动让玩家不出来的水平上运行无法恢复。