Issue with positioning SKSpriteNode in SKScene - swift

Question

This is my first project with SpriteKit and I am following THIS tutorial
But when I try to give the position to the Image as he did into that tutorial at 20:10 with this code :
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) {
}
}
I want to give position at bottom of the screen but I got this Output:
But the output should be:
GameScene.swift (If needed)
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 */
}
}
Can anybody tell me how can I achieve this?
Thanks In advance.

Answer 1

You need to look at the tutorial properly. You have set the following lines wrong:
self.runningBar.anchorPoint = CGPointMake(0.5, 0.5)
self.runningBar.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame) - (self.runningBar.size.height / 2))
They should be:
self.runningBar.anchorPoint = CGPointMake(0, 0.5)
self.runningBar.position = CGPointMake(CGRectGetMinX(self.frame), CGRectGetMinY(self.frame) + (self.runningBar.size.height / 2))
For a better understanding of the coordinate system, have a look at the documentation.