Sample Answer
I’d start by clarifying requirements: what needs to work offline (view only, create/edit), how long data should be cached, and conflict resolution rules. Then I’d introduce a local persistence layer, likely using Core Data or SQLite/Realm for structured data like tasks. I’d refactor the feature to depend on a repository that abstracts data access. The repository would read/write from the local store and sync with the server when connectivity is available. For example, when the user creates or edits a task offline, I’d mark it as “pending sync” with an operation type and a last-modified timestamp. A background sync manager would observe reachability or use periodic app launches to push pending changes and pull server updates, resolving conflicts based on timestamps or server-side rules. I’d ensure UI states make it clear when data is offline or pending sync. For validation, I’d add unit tests for the repository and integration tests around sync flows, measuring sync success rates and error frequencies after rollout.
Keywords
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