iOS Data & Networking.

The iOS data/IO layer: URLSession networking, Core Data/SwiftData and persistence. Covers 4 sub-skills.

• iOS Data & Networking · 1 of 3

  URLSession & Networking

  Modern Swift servers commonly return JSON with snake_case keys. What's the idiomatic way to decode them into camelCase Swift properties without writing CodingKeys?

  ASet decoder.nonConformingFloatStrategy = .convertFromStringBSet decoder.dataDecodingStrategy = .deferredToData for snake keysCSet decoder.dateDecodingStrategy = .iso8601 to also map keysDSet decoder.keyDecodingStrategy = .convertFromSnakeCase

• iOS Data & Networking · 2 of 3

  URLSession & Networking

  You're authenticating a user against a third-party OAuth provider from a SwiftUI app. Which Apple-provided API is the modern recommendation for the redirect flow?

  AASWebAuthenticationSession with a custom callback URL schemeBWKWebView with JavaScript bridge to capture the redirect URLCSFSafariViewController with manual URL polling for the redirectDUIApplication.shared.open(url:) plus universal-link interception

• iOS Data & Networking · 3 of 3

  Core Data & SwiftData Persistence

  In SwiftData, a developer fetches a list with a FetchDescriptor and wants to page results. Which descriptor properties express "skip the first 40 rows and return the next 20"?

  ASet fetchLimit to 40 and fetchOffset to 20 on the FetchDescriptorBSet fetchOffset to 40 and fetchLimit to 20 on the FetchDescriptorCSet propertiesToFetch to a 20-item subset starting at index 40DSet a sortBy with a range of 40 through 60 and leave the limit unset