Data layer for a tabbed app
This is a whiteboard design. You're building a stripped-down Outlook app with only a Messages tab and a Contacts tab. Data read from the API has to show up in both tabs with no lag, and you need to optimize launch time and downloads so contacts appear as early as possible. Design the layers and the data flow.
ArchitectureShort answerAdvanced
In an existing UIKit shopping app, the UIViewController handles the API calls, the cache,…
#repository #caching
iOS system designShort answerBasics
How is an "offline-first" app architecture different from the usual "network first, fall …
#repository #single-source-of-truth
ArchitectureShort answerBasics
You're designing an iOS file and folder list feature with search and pull-to-refresh. To …
#repository
iOS system designShort answerExpert
When the user double-taps to like a post in the Instagram detail screen, the same post in…
#single-source-of-truth