axiom-cloud-sync

Choose CloudKit for syncing structured data with rich relationships, and iCloud Drive for file-based user documents. The right cloud sync choice depends on whether your app manages database records or files across iOS and macOS.

Offline-first sync uses local-first storage to save data immediately on device, queuing changes to sync to the cloud once connectivity returns. This prevents data loss by ensuring operations never depend on a live network connection.

Implement conflict resolution by defining merge rules within your SwiftData + CloudKit integration, resolving local and remote changes during sync. Proper conflict handling prevents overwrites when multiple devices modify the same record.

Yes, you need iCloud entitlements and CloudKit support enabled in your app target to use CKSyncEngine. Data synchronization with CloudKit requires this environment setup to authenticate and transfer data between devices.

The best way to sync user documents is using iCloud Drive with NSFile coordination. This approach handles file-based data synchronization natively across iOS and macOS, managing file transfers and versioning reliably.

Data loss during poor networks happens when apps lack local-first storage and proper error handling. Implementing offline-first patterns with queued sync operations and conflict resolution prevents losing pending changes when connectivity drops.