SpriteKit

Build 2D games and interactive animations for iOS 26+ using SpriteKit and Swift 6.3. Covers scene lifecycle, node hierarchy, actions, physics, particles, camera, touch handling, and SwiftUI integration.

Contents

• Scene Setup
• Nodes and Sprites
• Actions and Animation
• Physics
• Touch Handling
• Camera
• Particle Effects
• SwiftUI Integration
• Common Mistakes
• Review Checklist
• References

Scene Setup

SpriteKit renders content through SKView, which presents an SKScene -- the root node of a tree that the framework animates and renders each frame.

Creating a Scene

Subclass SKScene and override lifecycle methods. The coordinate system origin is at the bottom-left by default.

import SpriteKit

final class GameScene: SKScene {
    override func didMove(to view: SKView) {
        backgroundColor = .darkGray
        physicsWorld.contactDelegate = self
        physicsBody = SKPhysicsBody(edgeLoopFrom: frame)
        setupNodes()
    }

    override func update(_ currentTime: TimeInterval) {
        // Called once per frame before actions are evaluated.
    }
}

Presenting a Scene (UIKit)

guard let skView = view as? SKView else { return }
skView.ignoresSiblingOrder = true

let scene = GameScene(size: skView.bounds.size)
scene.scaleMode = .resizeFill
skView.presentScene(scene)

Scale Modes

Use .resizeFill when the scene should adapt to view size changes (rotation, multitasking). Use .aspectFill for fixed-design game scenes. .aspectFit letterboxes; .fill stretches and may distort.

Frame Cycle

Each frame follows this order: