I'm struggling with the basics of SwiftUI... How can I transition between different views of an app?

To transition between different views in a SwiftUI app, you can use several built-in mechanisms and customize them to fit your needs. Here are some key points and examples from the WWDC sessions:

1. Basic View Transitions:

   • SwiftUI provides built-in transitions like opacity, scale, and slide. You can apply these transitions to views to animate their appearance and disappearance.

   • For example, to show or hide an avatar based on online status, you can use a scale transition:

     .transition(.scale)
     

   • You can also combine multiple transitions using the combined method:

     .transition(.scale.combined(with: .opacity))
     

   For more details, you can refer to the session Create custom visual effects with SwiftUI.

2. Navigation Transitions:

   • SwiftUI's NavigationLink provides a default slide transition when navigating between views. However, you can customize this using the navigationTransitionStyle modifier.
   • For example, to use a zoom transition:

     .navigationTransitionStyle(.zoom)
     

   For a detailed example, see the session Enhance your UI animations and transitions.

3. State-Driven Transitions:

   • SwiftUI views are state-driven, meaning that when the state changes, the view updates automatically. You can wrap state changes with animations to create smooth transitions.
   • For example, to animate a state change:

     withAnimation {
         self.state = newState
     }
     

   For more on state-driven updates and animations, check out SwiftUI essentials.

4. Custom Transitions:

   • You can create custom transitions by defining your own transition effects. This involves using the transition modifier with a custom AnyTransition.
   • For example:

     .transition(AnyTransition.asymmetric(insertion: .move(edge: .leading), removal: .move(edge: .trailing)))
     

   For more advanced customizations, refer to the session Create custom visual effects with SwiftUI.

By leveraging these techniques, you can create smooth and visually appealing transitions between different views in your SwiftUI app.