How do I design local-first data architectures in Swift?

Local-first data architectures prioritize local data storage and offline accessibility to improve user experience and provide a seamless interaction with applications, even without network connectivity. This approach is particularly useful in scenarios where consistent uptime is critical and where data integrity must be maintained without relying on continuous server availability.
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// Example of a local-first data architecture in Swift class LocalDataStore { private var data: [String: Any] = [:] func saveData(forKey key: String, value: Any) { data[key] = value // Persist data to local storage (e.g., UserDefaults or Realm) UserDefaults.standard.set(value, forKey: key) } func retrieveData(forKey key: String) -> Any? { // Attempt to retrieve from local data store if let value = data[key] { return value } // Fallback to UserDefaults return UserDefaults.standard.value(forKey: key) } } // Usage let localStore = LocalDataStore() localStore.saveData(forKey: "username", value: "JohnDoe") let username = localStore.retrieveData(forKey: "username") print("Retrieved username: \(username ?? "nil")")

local-first data architecture offline-first Swift iOS development user experience data integrity

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