How to add physics to an SKSpriteNode
Swift version: 5.6
SpriteKit comes with a modified version of the Box2D physics framework, and it's wrapped up a lot of complicated physics mathematics into just one or two lines of code. For example, we can create a square, red sprite and give it rectangular physics like this:
let box = SKSpriteNode(color: UIColor.red, size: CGSize(width: 64, height: 64))
box.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: 64, height: 64))That rectangle will wrap perfectly around the box's color, so it will bounce and rotate as it collides with other objects in your scene.
If you want to create circular physics to simulate balls, this is done using the circleOfRadius constructor:
let ball = SKSpriteNode(imageNamed: "ballRed")
ball.physicsBody = SKPhysicsBody(circleOfRadius: ball.size.width / 2.0)TAKE YOUR SKILLS TO THE NEXT LEVEL If you like Hacking with Swift, you'll love Hacking with Swift+ – it's my premium service where you can learn advanced Swift and SwiftUI, functional programming, algorithms, and more. Plus it comes with stacks of benefits, including monthly live streams, downloadable projects, a 20% discount on all books, and free gifts!
Sponsor Hacking with Swift and reach the world's largest Swift community!
Available from iOS 7.0 – see Hacking with Swift tutorial 11
Similar solutions…
- How to add pixel-perfect physics to an SKSpriteNode
- How to stop an SKPhysicsBody responding to physics using its dynamic property
- How to add a fragment shader to an SKSpriteNode using SKShader
- How to debug physics in a SpriteKit scene using showsPhysics
- How to color an SKSpriteNode using colorBlendFactor
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
