Getting Started with SpriteKit by Jorge Jordan

Author:Jorge Jordan [Jordan, Jorge]
Language: eng
Format: azw3, epub
Publisher: Packt Publishing
Published: 2016-01-25T05:00:00+00:00

Furthermore, let's declare some variables that will be useful for the development of the parallax effect. Add the following lines just after private var isEnemyCollisionDetected: Bool = false:

private var backgroundBottom: SKSpriteNode! private var backgroundTop: SKSpriteNode! private var treesBottom: SKSpriteNode! private var treesTop: SKSpriteNode!

To initialize these variables, we are going to call a new method. Add the following line at the end of didMoveToView:

self.initializeParallaxEffect()

Implement this with the following lines of code:

func initializeParallaxEffect() { // Initialize background layers backgroundBottom = SKSpriteNode(imageNamed: "background") backgroundBottom.anchorPoint = .zero backgroundBottom.zPosition = -1 // Copy the previous node into another backgroundTop = backgroundBottom.copy() as! SKSpriteNode // Set top layer position backgroundTop.position = CGPoint(x: backgroundBottom.position.x, y: backgroundBottom.position.y + backgroundBottom.size.height) // Initialize tree layers treesBottom = SKSpriteNode(imageNamed: "trees") treesBottom.zPosition = 4 treesBottom.position = CGPoint(x:(view!.bounds.size.width/2), y: view!.bounds.size.height/2) // Copy the previous node into another treesTop = treesBottom.copy() as! SKSpriteNode // Set top layer position treesTop.position = CGPoint(x: treesBottom.position.x, y: treesBottom.position.y + treesBottom.size.height) // Add background layers to the scene addChild(backgroundBottom) addChild(backgroundTop) // Add tree layers to the scene addChild(treesBottom) addChild(treesTop) }

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