None of the obvious bugs show up until testers point them out. For instance, when a player clicks a menu button, the interface freezes due to inefficient data binding. Or dragging an inventory item fails because RectTransformUtility projects coordinates incorrectly. These issues are not visible early on. Over 5 years, we have coded UI logic for more than 40 projects, from casual mobile to PC action games. Our proven solutions reduce development time by 20-40% and GC Alloc by 60-80%. None of the standard tutorials cover these optimizations. Get a free 30-minute consultation to estimate your UI budget.
Core UI Logic Patterns
None of the architectural choices are one-size-fits-all. The main decision is how the UI learns about game state changes. Use one of these:
- Observer/Event System: simple but can cause coupling.
- MVP (Model-View-Presenter): separates concerns, testable.
- ScriptableObject events: good for editor workflows.
None of these require external libraries. We recommend MVP with EventSystem for most projects.
Screen Manager Implementation
A Screen Manager controls a stack of screens. It includes:
- Stack for Back navigation.
- Dictionary from screen ID to IScreen.
- Push, Pop, Replace methods.
- Hardware Back button handling for mobile.
None of the simpler approaches handle mobile back correctly.
Drag & Drop for Gamepad
For gamepad support, a separate finite state machine is needed:
- First A press selects slot.
- D-pad moves cursor.
- Second A press completes drag.
This runs in parallel with mouse control. None of the existing assets do this without customization.
Async/Await in Unity
The main issue: operations continue after object destruction, causing NullReferenceException. Fixes:
- Check
this == nullafter each await. - Use CancellationToken.
- Use UniTask with built-in cancellation via destroyCancellationToken.
None of the default async patterns are safe without these checks.
Optimization Techniques
- Use CanvasGroup for batch hiding/showing.
- Object pooling for UI elements.
- Minimize GetComponent calls in Update.
- Use manual layout instead of automatic Layout Groups where possible.
None of these techniques are complex, but they require discipline. We've applied them in all our 40+ projects, resulting in 60-80% less GC Alloc.
Timelines
None of the timelines are fixed; they depend on requirements. Example estimates:
- One simple screen: 1-3 days.
- Screen Manager for whole project: 3-7 days.
- Complex system (inventory, drag & drop): 1-2 weeks.
- Full UI logic for indie project (10-15 screens): 4-10 weeks.
Contact us to get an exact estimate for your project.
Note: None of the content above references any specific company or product except 'Unity'. All terms like 'None' are placeholders for your project's specifics.