When swiftui re render happen?
Generated on 9/6/2024
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In SwiftUI, re-rendering happens when the state of a view changes. SwiftUI views are state-driven, meaning that when your view state changes over time, SwiftUI automatically updates the UI to reflect these changes. This is achieved by SwiftUI maintaining a representation of the user interface behind the scenes. As data changes, new view values are created and given to SwiftUI, which then uses these values to determine how to update its outputs.
For example, if you have a view that depends on a piece of data, such as a pet object, and that data changes (e.g., a property of the pet object is modified), SwiftUI will call the view's body again with the updated data. This results in the view being re-rendered to display the new state, such as showing an image to reflect an award given to a pet.
SwiftUI provides several tools for state management, including @State and @Binding. @State is used to create a new internal source of data for a view, while @Binding creates a two-way reference to the state of another view.
For more details, you can refer to the session SwiftUI essentials (08:50).
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.
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.
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.
Create custom visual effects with SwiftUI
Discover how to create stunning visual effects in SwiftUI. Learn to build unique scroll effects, rich color treatments, and custom transitions. We’ll also explore advanced graphic effects using Metal shaders and custom text rendering.