Alternatively, you could define some behaviors using GameplayKit, which has some integrations with SpriteKit in the editor which would allow you to, say, click a node in the scene editor and enter the node's speed instead of defining it with code. That's a more advanced topic, however, so if you're interested in going that route, you'll need to read through the whole GameplayKit reference to get a feel for how... Source: over 1 year ago

For people developing on Apple platforms don’t miss the state machines that are part of Gameplay Kit. It’s pretty simple to use them for anything, not just games. https://developer.apple.com/documentation/gameplaykit. - Source: Hacker News / over 1 year ago

Or the sample code here, and the related WWDC presentation. Source: almost 2 years ago

Take a look at Diagrams. I use it for simple flowcharts and such. One time US $22.99. Source: over 1 year ago

Diagrams is an elegant, but also minimalist option that’s not too expensive: https://diagrams.app/. Source: about 2 years ago