問題與SKScene

Question

定位SKSpriteNode這是我與SpriteKit的第一個項目，我下面THIS教程 但是，當我試着給的位置，像他那樣進入該教程在20:10這段代碼的圖片：

playScene.swift

import SpriteKit 

class playScene : SKScene { 

let runningBar = SKSpriteNode(imageNamed: "bar") 

override func didMoveToView(view: SKView) { 
    println("We are at the new scene!") 
    self.backgroundColor = UIColor(hex: 0x80D9FF, alpha: 1) 
    self.runningBar.anchorPoint = CGPointMake(0.5, 0.5) 
    self.runningBar.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame) - (self.runningBar.size.height/2)) 
    self.addChild(self.runningBar) 

} 
override func update(currentTime: NSTimeInterval) { 

    } 
} 

我想在屏幕下方給的位置，但我得到了這樣的輸出：

但輸出應該是：

GameScene.swift（如果需要）

import SpriteKit 

class GameScene: SKScene { 

let playButton = SKSpriteNode(imageNamed: "play") 

override func didMoveToView(view: SKView) { 

    self.playButton.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame)) 
    self.addChild(self.playButton) 
    self.backgroundColor = UIColor(hex: 0x80D9FF, alpha: 1) 

} 

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) { 

    for touch: AnyObject in touches{ 
     let location = touch.locationInNode(self) 
     if self.nodeAtPoint(location) == self.playButton{ 
      var scene = playScene(size: size.self) 
      let skView = self.view as SKView! 
      skView.ignoresSiblingOrder = true 
      scene.scaleMode = .ResizeFill 
      scene.size = skView.bounds.size 
      skView.presentScene(scene) 
     } 

    } 

} 

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

誰能告訴我怎樣才能做到這一點？

謝謝提前。

Answer 1

你需要正確的看教程。你已經錯了設置以下行：

self.runningBar.anchorPoint = CGPointMake(0.5, 0.5) 
self.runningBar.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame) - (self.runningBar.size.height/2)) 

他們應該是：

self.runningBar.anchorPoint = CGPointMake(0, 0.5) 
self.runningBar.position = CGPointMake(CGRectGetMinX(self.frame), CGRectGetMinY(self.frame) + (self.runningBar.size.height/2)) 

爲了更好地理解座標系統的，有看documentation。