OC Category add property
Generated on 8/5/2024
1 search
To add a property in an Objective-C category, you can use the new entry macro introduced in SwiftUI. This macro provides a convenient syntax for adding new values to SwiftUI keyed storage types, including environment values, focus values, and more.
Here's a brief overview of how you can define a new kind of container value using the entry macro:
- Create an Extension: Start by creating an extension on the container values type.
- Declare a Property: Within the extension, declare a property using the new entry macro. This property can store any value, such as a boolean to track if a card has been rejected.
- Custom View Modifier: Declare a custom view modifier as a convenience for setting your property. This modifier will call through to the new container value API modifier, passing the property's keypath and the new value to set.
- Support in Container: Add support for your new container value within your container. Customize each view depending on the property value.
For more detailed information, you can refer to the session Demystify SwiftUI containers (14:45).
Relevant Sessions
These sessions provide insights into the new entry macro and how to use it effectively in SwiftUI.
Explore object tracking for visionOS
Find out how you can use object tracking to turn real-world objects into virtual anchors in your visionOS app. Learn how you can build spatial experiences with object tracking from start to finish. Find out how to create a reference object using machine learning in Create ML and attach content relative to your target object in Reality Composer Pro, RealityKit or ARKit APIs.
Swift Charts: Vectorized and function plots
The plot thickens! Learn how to render beautiful charts representing math functions and extensive datasets using function and vectorized plots in your app. Whether you’re looking to display functions common in aerodynamics, magnetism, and higher order field theory, or create large interactive heat maps, Swift Charts has you covered.
Run, Break, Inspect: Explore effective debugging in LLDB
Learn how to use LLDB to explore and debug codebases. We’ll show you how to make the most of crashlogs and backtraces, and how to supercharge breakpoints with actions and complex stop conditions. We’ll also explore how the “p” command and the latest features in Swift 6 can enhance your debugging experience.
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 the immersion of media viewing in custom environments
Extend your media viewing experience using Reality Composer Pro components like Docking Region, Reverb, and Virtual Environment Probe. Find out how to further enhance immersion using Reflections, Tint Surroundings Effect, SharePlay, and the Immersive Environment Picker.
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.
What’s new in SwiftUI
Learn how you can use SwiftUI to build great apps for any Apple platform. Explore a fresh new look and feel for tabs and documents on iPadOS. Improve your window management with new windowing APIs, and gain more control over immersive spaces and volumes in your visionOS apps. We’ll also take you through other exciting refinements that help you make expressive charts, customize and layout text, and so much more.
Catch up on accessibility in SwiftUI
SwiftUI makes it easy to build amazing experiences that are accessible to everyone. We’ll discover how assistive technologies understand and navigate your app through the rich accessibility elements provided by SwiftUI. We’ll also discuss how you can further customize these experiences by providing more information about your app’s content and interactions by using accessibility modifiers.