Topic 16. MVVM architecture, navigation, and working with a database in Compose Multiplatform applications

Goal: learn to separate screen state from the UI, pass route arguments, work with a repository, and test a ViewModel.

Lecture contents

1. MVVM and unidirectional data flow — Why one composable is not enough · Consistent dependencies · Unidirectional data flow
2. Navigation as history state — Navigation as history state
3. Repository and loading data — The repository boundary and the loading lifecycle
4. Events, tests, and packaging — Errors, one-time events, and drafts · Example 4. Testing a ViewModel with a fake repository · Packaging and final checks

Practice and review

• Practice — 3 worked examples with complete code
• Tasks — 30 variants, each with tasks at three difficulty levels
• Summary — conclusions and self-check questions