How do you design a scalable caching architecture for offline-first iOS apps?

A scalable caching system combines memory, disk, and network-aware strategies with invalidation policies.

Advanced caching architecture uses a layered approach: in-memory cache (NSCache) for speed, disk cache for persistence, and network layer for synchronization. Cache invalidation strategies such as TTL (time-to-live), LRU eviction, and version-based invalidation ensure consistency. Offline-first systems also require merge conflict resolution when syncing back to server.