Alarm framework 怎么使用

To use the AlarmKit framework, you can follow these steps as outlined in the session "Wake up to the AlarmKit API" from WWDC 2025:

1. Authorization: Before scheduling alarms, you need to obtain user authorization. You can request authorization manually using the AlarmManager's Request Authorization API, or it will be requested automatically when you create your first alarm. Make sure to add NSAlarmKitUsageDescription to your app's info plist to explain the use case for presenting alarms.

2. Creating an Alarm:

   • Define the countdown duration and schedule. You can set a fixed schedule with a specific date or a relative schedule with a recurrence pattern.
   • Customize the alarm's appearance by creating alert buttons using the AlarmButton struct. You can specify text, text color, and system images for these buttons.
   • Set up the alarm attributes and configuration, including the countdown duration, schedule, and any custom metadata.

3. Managing Alarms: Use the AlarmManager class to manage the lifecycle of your alarms. You can schedule, cancel, stop, pause, or resume alarms using their unique identifiers.

4. Customizing Actions: You can define custom actions for alarm buttons using app intents. For example, you can create a secondary button that opens your app when tapped.

5. Live Activities: If your alarm supports countdown functionality, implement a live activity to show the countdown UI on the lock screen, dynamic island, and in standby mode.

For more detailed guidance, you can refer to the session Wake up to the AlarmKit API from WWDC 2025.