Game UI Logic Implementation Techniques

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:

1. First A press selects slot.
2. D-pad moves cursor.
3. 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 == null after 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.