View controllers: The Right Way
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Bottom-up approach to relieve ViewController's from some responsabilities. The first part is about how we can define a component and then how these components interact between them.
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View controllers: The Right Way
- 2. @FranDepascuali francisco.depascuali@gmail.com Speaker iOS developer (1.5 years) @Wolox Software Engineering @ITBA
- 3. Content • State of the art • Problem • Solution • Demo • Components • Demo • Questions?
- 4. State of the art
- 6. VC Responsibilities • Model - View binding • Handle user input Ideal world
- 7. VC Responsabilidades • Model - View binding • Handle user input Ideal WorldReal World • Model - View binding • Handle user input • Layout • Navigation flow • Data source • Persistance • Data fetching & transformation • Model mutation
- 8. MVVM • ViewModel - View binding • Handle user input • Layout • Navigation flow View ControllerView Model • Data source • Persistance (Services, Repositories) • Data fetching & transformation • Model mutation
- 13. Problem
- 14. Problem • Layout is ViewController’s responsibility. • Can’t inject dependencies on ViewController’s init method: • Inconsistent state of ViewController at initialization. • User needs to call a function. • Mutability: Different semantic meaning.
- 15. Solution
- 16. Solution • Layout in ViewController’s view • Inject dependencies in ViewController’s init method
- 18. Bind xib with view
- 19. Add outlets to the VIEW!
- 20. NibLoadable Represents a component that can be loaded from a nib.
- 21. NibLoadable Represents a component that can be loaded from a nib. Default implementation for UIViews: Load a view by its name
- 22. Load the view from the nib in the controller NibLoadable
- 23. Storyboards way
- 25. Demo
- 26. Components
- 27. Components
- 28. Demo
- 29. Trade-offs • Storyboards not supported • Deep thinking about components relationships
- 30. Questions?
- 31. Reference • Simple made easy - Rich Hickey • WWDC session 229: Adv. iOS Application Architecture and Patterns - Andy Matuschak • Let’s Play: Refactor the Mega-Controller - Andy Matuschak • Repo: https://github.com/Wolox/wolmo-core- ios