Grokking Modern Mobile System Design Interview
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Unidirectional Data Flow in SwiftUI and Compose

SwiftUI and Jetpack Compose describe the UI from state. When relevant state changes, the framework updates the displayed result.

This approach works best when the app has a clear rule for changing state. Unidirectional data flow means that events go to a state owner, and the resulting state goes to the UI.

Follow one update cycle

For a feed refresh, the cycle is:

  1. The user requests a refresh.
  2. The state owner marks the refresh as running.
  3. A separate operation asks the repository for updated data.
  4. The operation reports success or failure. 5

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