Adding Points and Sound - Beginning Swift Games Development for iOS - page 113

Now that you know how to use SKLabelNode , it is time to put it to some good use. As
mentioned at the beginning of this topic, the goal of this game is to collect as many orbs
as you can without colliding with a black hole or running out of impulses.
In this section, you will finally add some scoring to the game. Specifically, you will add
an SKLabelNode to the top right of the scene. The original text will be “SCORE : 0.”
This numeric value will increment each time the playerNode comes into contact with
an orb node—the more orbs collected, the higher your score. Let's make this happen.
The first step you need to do to add a scoring label to the GameScene is to create a vari-
able to hold the score (the number of orbs collected) and an SKLabelNode constant to
hold the label. This can be accomplished with the following two lines of code:
var score = 0
let scoreTextNode = SKLabelNode(fontNamed: "Copperplate")
This code is pretty straightforward. It creates an integer variable named score and sets it
to 0, which makes sense at the beginning of a game, and then it creates an SKLa-
belNode with a font of Copperplate. I chose Copperplate because I thought it looked
good with the images already in place, but you can choose whatever you like. After look-
ing at this code, add it to the end of the GameScene 's declaration section immediately
before the first init() method:
var score = 0
let scoreTextNode = SKLabelNode(fontNamed: "Copperplate")
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
The next thing you need to do is set all of the SKLabelNode 's properties and add it to
the GameScene . This is accomplished in the following snippet:
scoreTextNode.text = "SCORE : \(score)"
scoreTextNode.fontSize = 20
scoreTextNode.fontColor = SKColor.whiteColor()
scoreTextNode.position =
CGPointMake(size.width - 10,
size.height - 20)
scoreTextNode.horizontalAlignmentMode
= SKLabelHorizontalAlignmentMode.Right