collectionview의 decorationview에 대해 알려줘

Demystify SwiftUI containers

Learn about the capabilities of SwiftUI container views and build a mental model for how subviews are managed by their containers. Leverage new APIs to build your own custom containers, create modifiers to customize container content, and give your containers that extra polish that helps your apps stand out.

Evolve your document launch experience

Make your document-based app stand out, and bring its unique identity into focus with the new document launch experience. Learn how to leverage the new API to customize the first screen people see when they launch your app. Utilize the new system-provided design, and amend it with custom actions, delightful decorative views, and impressive animations.

What’s new in watchOS 11

Explore new opportunities on Apple Watch, including bringing Double Tap support to your watchOS app, making your Smart Stack widgets even more relevant and interactive, and displaying your iOS Live Activities in the Smart Stack.

Dive deep into volumes and immersive spaces

Discover powerful new ways to customize volumes and immersive spaces in visionOS. Learn to fine-tune how volumes resize and respond to people moving around them. Make volumes and immersive spaces interact through the power of coordinate conversions. Find out how to make your app react when people adjust immersion with the Digital Crown, and use a surrounding effect to dynamically customize the passthrough tint in your immersive space experience.

Enhance your UI animations and transitions

Explore how to adopt the zoom transition in navigation and presentations to increase the sense of continuity in your app, and learn how to animate UIKit views with SwiftUI animations to make it easier to build animations that feel continuous.

SwiftUI essentials

Join us on a tour of SwiftUI, Apple’s declarative user interface framework. Learn essential concepts for building apps in SwiftUI, like views, state variables, and layout. Discover the breadth of APIs for building fully featured experiences and crafting unique custom components. Whether you’re brand new to SwiftUI or an experienced developer, you’ll learn how to take advantage of what SwiftUI has to offer when building great apps.