SpriteKit makes it easy for a node to follow a path we specify, and you can use it to make rockets take off, enemies to zig zag around a maze, and more.
First, create a
UIBezierPath specifying the shape of your path:
let path = UIBezierPath() path.move(to: CGPoint(x: 0, y: 0)) path.addLine(to: CGPoint(x: 0, y: 1000))
That will move directly up.
Next, turn that into an
SKAction.follow(). You can specify whether this path is an offset or contains absolute coordinates – we used X:0 Y:0 above, so if we request offset movement that will be equivalent to the node’s starting position.
follow() method also accepts parameters for speed (how fast the movement should happen), and whether the node should orient itself to the path. The orientation option is particularly neat: your node will turn itself so that it’s always facing towards the path.
Try this code to make a node follow a path with path orientation enabled:
let move = SKAction.follow(path.cgPath, asOffset: true, orientToPath: true, speed: 200) node.run(move)
Available from iOS 7.0 – see Hacking with Swift tutorial 20
Did this solution work for you? Please pass it on!
Other people are reading…
About the Swift Knowledge Base
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
Get the ultimate experience
The Swift Power Pack includes my first six books for one low price, helping you jumpstart a new career in iOS development – check it out!