How to create scroll view?

To create a scroll view in SwiftUI, you can use the ScrollView component. Here are some examples and techniques mentioned in the WWDC sessions:

1. Basic Scroll View:

   • You can create a simple horizontal or vertical scroll view by wrapping your content in a ScrollView and specifying the axis of scrolling.

   ScrollView(.vertical) {
       VStack {
           ForEach(0..<50) { index in
               Text("Item \(index)")
                   .padding()
           }
       }
   }
   

2. Custom Scroll Effects:

   • You can use the scrollTransition modifier to create custom scroll effects. This allows you to change the appearance of elements based on their position in the scroll view.

   ScrollView(.horizontal) {
       HStack {
           ForEach(0..<10) { index in
               Image(systemName: "photo")
                   .resizable()
                   .frame(width: 100, height: 100)
                   .scrollTransition { content, phase in
                       content
                           .rotationEffect(.degrees(phase.value * 360))
                   }
           }
       }
   }
   

   For more details on creating custom scroll effects, you can refer to the session Create custom visual effects with SwiftUI (00:02:07).

3. Advanced Scroll View Modifiers:

   • In tvOS 18, new view modifiers specific to ScrollView have been introduced. These include modifiers to handle visibility changes and scroll target behavior.

   ScrollView {
       VStack {
           // Your content here
       }
       .onScrollVisibilityChange { isVisible in
           // Handle visibility change
       }
       .scrollTargetBehavior(.viewAligned)
   }
   

   For more information on these new modifiers, you can check the session Migrate your TVML app to SwiftUI (00:10:07).

4. Programmatic Control and Enhancements:

   • SwiftUI provides more programmatic control over scroll views, including the ability to scroll to specific positions and control content alignment.

   ScrollView {
       VStack {
           // Your content here
       }
       .scrollPosition(.top)
       .scrollBounceBehavior(.disabled)
   }
   

   For more details on these enhancements, refer to the session What’s new in SwiftUI (00:16:18).

By using these techniques, you can create and customize scroll views in SwiftUI to fit your app's needs.