how to build custom swiftui copomnents

To build custom SwiftUI components, you can leverage several techniques and APIs discussed in the WWDC sessions. Here are some key points and resources to help you get started:

1. Understanding Composition:

   • SwiftUI allows you to create flexible and reusable components by composing different kinds of content together. For example, you can use a ForEach view to generate views from data dynamically.
   • Demystify SwiftUI containers (03:07) discusses how to make your container more flexible by adding support for more kinds of composition in its content.

2. Custom Container Views:

   • SwiftUI provides many full-featured container views like List, which use a trailing ViewBuilder closure to wrap their content. You can define content statically or dynamically.
   • Demystify SwiftUI containers (00:07) introduces building custom container views in SwiftUI, including using new APIs to support advanced capabilities like grouping content into sections and applying container-specific modifiers.

3. Low-Level Control and Custom Layouts:

   • SwiftUI offers APIs for low-level control, such as creating custom control styles, using Canvas for high-performance imperative drawing, and applying custom Metal shaders directly to SwiftUI views.
   • SwiftUI essentials (15:57) covers how to create unique custom experiences using these low-level tools.

4. Declarative and Adaptive Views:

   • SwiftUI views are declarative, compositional, and state-driven. You describe what view you want in your user interface, and SwiftUI produces the result.
   • SwiftUI essentials (01:47) explains the fundamentals of views in SwiftUI, emphasizing their declarative nature.

5. Interoperability with UIKit and AppKit:

   • SwiftUI seamlessly interoperates with UIKit and AppKit. You can use UIViewRepresentable to create and update UIKit views within SwiftUI, and HostingViewController to embed SwiftUI views in UIKit or AppKit view hierarchies.
   • SwiftUI essentials (21:25) discusses SDK interoperability and how to integrate SwiftUI with existing UIKit or AppKit components.

For more detailed guidance, you can refer to the following sessions:

• Demystify SwiftUI containers
• SwiftUI essentials

These sessions provide comprehensive insights into building custom SwiftUI components and leveraging the full capabilities of the framework.