When should I call view will appear

Generated on 7/31/2024

1 search

You should call viewWillAppear during the transition phase when a view controller is about to be added to the view hierarchy and become visible. This is part of the view controller lifecycle in UIKit. Specifically, viewWillAppear is called after the view controller has been instantiated and before it is presented on the screen.

For a detailed explanation, you can refer to the session Enhance your UI animations and transitions at the timestamp 04:24.

Bring your app’s core features to users with App Intents

Bring your app’s core features to users with App Intents

Learn the principles of the App Intents framework, like intents, entities, and queries, and how you can harness them to expose your app’s most important functionality right where people need it most. Find out how to build deep integration between your app and the many system features built on top of App Intents, including Siri, controls and widgets, Apple Pencil, Shortcuts, the Action button, and more. Get tips on how to build your App Intents integrations efficiently to create the best experiences in every surface while still sharing code and core functionality.

Migrate your TVML app to SwiftUI

Migrate your TVML app to SwiftUI

SwiftUI helps you build great apps on all Apple platforms and is the preferred toolkit for bringing your content into the living room with tvOS 18. Learn how to use SwiftUI to create familiar layouts and controls from TVMLKit, and get tips and best practices.

Enhance your UI animations and transitions

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.

Explore multiview video playback in visionOS

Explore multiview video playback in visionOS

Learn how AVExperienceController can enable playback of multiple videos on Apple Vision Pro. Review best practices for adoption and explore great use cases, like viewing a sports broadcast from different angles or watching multiple games simultaneously. And discover how to design a compelling and intuitive multiview experience in your app.