概要
This skill serves as a definitive guide for developers building iCloud-enabled applications on Apple platforms. It covers a wide range of implementation strategies, including modern SwiftData integration for iOS 17+, the specialized CKSyncEngine for custom persistence layers, and low-level CloudKit APIs for maximum control. With detailed guidance on database scopes, conflict resolution, and performance monitoring via the CloudKit Console, it helps developers build reliable, scalable sync architectures while avoiding common pitfalls in structured data management.