How do I use CKSyncEngine?

To use CKSyncEngine, you can follow the steps outlined in the sessions from WWDC. Here are some relevant details:

1. Enable CloudKit in Your Project:

   • Add iCloud to the signing and capabilities of your Xcode project.
   • Turn on CloudKit under iCloud services and create a new container for syncing your data.
   • Add background modes and enable the remote notifications capability to allow your app to process remote changes in the background.

2. Sync Data Across Devices:

   • Use CloudKit to sync the display states for tips, ensuring that a user doesn't need to dismiss the same tip on multiple devices.
   • Update your configuration to include the CloudKit container option and pass in your new container's ID.

3. Handle Data Conflicts:

   • Implement a cloud save manager class to handle syncing, as demonstrated in the game porting project. This includes setting up your iCloud identifier and specifying an existing folder containing saved data.
   • At game launch, call the sync method and pass a completion handler block to handle any merge conflicts between local data and cloud data.
   • Save progress to the cloud by calling the upload method every time you write into save files, and use a completion handler to resolve conflicts.

For more detailed guidance, you can refer to the following sessions:

• Customize feature discovery with TipKit (10:48)
• Port advanced games to Apple platforms (18:53)
• Use CloudKit Console to monitor and optimize database activity (00:00)

These sessions provide comprehensive information on setting up and using CloudKit for syncing data across devices.