Syncing Core Data with iCloud

If you’re considering syncing Core Data to iCloud in your app, Drew McCormack of The Mental Faculty has a terrific series of articles discussing the difficulties he encountered while adding support for it to Mental Case.

Under the Sheets with iCloud and Core Data
Part 1: The Basics
Part 2: How It Works
Part 3: Seeding iCloud
Part 4: Working Code
Part 5: Sentinels
Part 6: Troubleshooting

Highly recommended.