Contact provider framework usage

To use the Contact Provider framework effectively, you can refer to the session titled "Meet the Contact Access Button" from WWDC 2024. Here are some key points and methods discussed in the session:

1. Authorization Levels:

   • Full Access: Your app can read and modify any contact data.
   • Limited Access: Your app can only access contacts that have been explicitly shared with it.
   • Not Determined: The authorization prompt will be presented when your app attempts to access the contact store.
   • Denied: Your app cannot read or write contact data.

2. Access Methods:

   • CNContactStore: The primary way to access contact data. It requires authorization and can fetch or create new contact entries. It also notifies when contact data changes.
   • CNContactPickerViewController: Provides access to a one-time snapshot of contact data. It works regardless of the authorization level and is best for one-off tasks like picking an email address or phone number.
   • Contact Access Button: A new UI element for managing access to additional contacts when your app has limited authorization. It can be used to grant access to new contacts with a single tap.

3. Best Practices:

   • Ensure the contact access button is legible, unobscured, and has enough room to render.
   • Use the contact access button for managing limited access directly within your app's UI.
   • Test your app on iOS 18 to ensure it works well with limited access.

For more detailed information, you can watch the session Meet the Contact Access Button starting at the chapter "Which access method to use".

Relevant Sessions

1. Meet the Contact Access Button
2. What’s new in privacy

If you need specific details or examples, you can refer to the timestamps provided in the context.