swiftiu redraw view

To understand how SwiftUI redraws views, it's important to know how SwiftUI handles state changes and view updates. When a state variable changes, SwiftUI doesn't immediately update the views. Instead, it creates a new transaction that represents the change to the view hierarchy. This transaction marks the state variable as outdated, and when SwiftUI is ready to update for the next frame, it runs the transaction and applies the update. This process ensures that only the necessary parts of the view hierarchy are updated, optimizing performance.

For more detailed insights into optimizing SwiftUI performance, you can refer to the session Optimize SwiftUI performance with Instruments, which discusses understanding the causes and effects of SwiftUI updates. This session provides tools and techniques to diagnose and fix long view body updates, ensuring your app runs smoothly.

If you're interested in learning more about the fundamentals of views in SwiftUI, the session SwiftUI essentials covers the basics, including how views are state-driven and automatically updated when their state changes.