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Data cache implementation in iOS uses various approaches and techniques:

  • NSCache — a class similar to a dictionary, but automatically clears the cache when memory is low. Good for temporary object storage.

  • UserDefaults — for storing small settings and user data.

  • File cache — storing data in the file system (e.g., in the Caches folder). Used for large or binary data.

  • Core Data — for complex caching with query capabilities and relationships between objects.

  • URLCache — built-in mechanism for caching network requests.

  • Third-party libraries — e.g., Realm, Kingfisher (for image caching).

The choice depends on the data type, volume, access speed requirements, and resilience to memory cleanup.