Mvvm

The Model-View-ViewModel (MVVM) pattern is a common architectural pattern used in SwiftUI to manage the state and behavior of views. SwiftUI's declarative syntax and state management features align well with the principles of MVVM.

Key Concepts in SwiftUI Related to MVVM

1. State Management:

   • SwiftUI views are state-driven. When the state changes, SwiftUI automatically updates the UI. This is similar to how the ViewModel in MVVM updates the View when the Model changes.
   • Example: Using @State to manage internal state and @Binding for two-way data binding between views.
   • SwiftUI essentials (08:50)

2. View Composition:

   • SwiftUI allows for the composition of views, which can be used to build complex UIs from smaller, reusable components. This aligns with the MVVM principle of separating the UI (View) from the business logic (ViewModel).
   • Example: Using custom views within a List and applying view modifiers for customization.
   • SwiftUI essentials (07:55)

3. Bindings and Single Source of Truth:

   • SwiftUI's @Binding property wrapper allows for a single source of truth, ensuring that the state is consistent across different parts of the UI.
   • Example: Using @Binding to synchronize state between a container view and its child views.
   • SwiftUI essentials (12:29)

Relevant Sessions

• SwiftUI essentials:
  • Fundamentals of views: Discusses state-driven views and how SwiftUI manages state changes.
  • Built-in capability: Explores built-in features and how to leverage them for complex UI compositions.

For more detailed information, you can refer to the SwiftUI essentials session from WWDC 2024.