How to add physics to an SKSpriteNode
Swift version: 5.1
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)LEARN SWIFTUI FOR FREE I have a massive, free SwiftUI video collection on YouTube teaching you how to build complete apps with SwiftUI – check it out!
Available from iOS 7.0 – see Hacking with Swift tutorial 11
Similar solutions…
- How to add pixel-perfect physics to an SKSpriteNode
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- How to debug physics in a SpriteKit scene using showsPhysics
- How to color an SKSpriteNode using colorBlendFactor
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