How do I decide between a state pattern and a switch for Unity enemy AI?

[StevenM]

I’ve been trying to implement a proper state machine for my enemy AI in Unity, but I keep running into issues where states seem to bleed into each other and cause weird behavior. My current setup uses a switch statement, and managing the transitions feels messy and error-prone. I’m wondering if a more structured approach, like the State pattern, is worth the extra architecture or if I’m just overcomplicating my basic NPCs.

[Zoey14]

I started with a straightforward switch in Update too, and yeah the transitions got tangled fast once you add patrol, chase, and attack. I split the logic into separate methods and even added a little lock during animation events so it can’t flip mid dash.

[AriaS]

I tried the state pattern with small state classes and a manager, and it did feel cleaner to test Seek, Attack, and Flee in isolation, but wiring everything up and keeping references sane ate more time than I expected.

[Sofia_W]

Are you sure the bleed isn’t just how you trigger transitions? I had jitter when I checked conditions every frame and the AI would flip states because a distance check crossed the threshold by a pixel.

[Amelia.W]

I kept a cheap timer so transitions can’t happen every frame, and I saw fewer false flips in a short playtest. Then someone suggested grouping behaviors into perception, combat, and patrol buckets, which helped but didn’t fix everything.