Best practices
Teach through interactivity.
Consider providing a collection of context-specific tips instead of a single onboarding flow.
If you need to present a prerequisite onboarding flow, design a brief, enjoyable experience that doesn’t require people to memorize a lot of information.
If it makes sense to offer a separate tutorial, consider making it optional.
Keep onboarding content focused on the experience you provide.
Additional content
Briefly display a splash screen if necessary.
Don’t let large downloads hinder onboarding.
Avoid displaying licensing details within your onboarding flow.
Additional requests
Postpone nonessential setup flows or customization steps.
If your app or game needs access to private data or resources before it can function, consider integrating the permission request into your onboarding flow.
Prefer letting people experience your app or game before prompting them for ratings or purchases.
For the complete guidance, including worked examples and illustrations, see the canonical page: https://developer.apple.com/design/human-interface-guidelines/onboarding