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Part 4: Agent Mode — Multi-File Refactoring

📚 Lab Guide • ← Completion

Goal: Use Agent Mode to make changes across multiple files automatically.

Scenario: Update the favorite indicator throughout the app to use heart icons.

Steps

  1. Open LandmarkList.swift Path: Landmarks/Views/Landmarks/LandmarkList.swift
  2. Open the Preview Canvas to see the current UI (Cmd + Option + Enter)
  3. Switch to Agent mode in the Copilot Chat panel
  4. Enter this prompt:
Update all favorite buttons to use heart-shaped icons (filled heart for favorited,
outline heart for not favorited) across all views in the project.
  1. Copilot will analyze the codebase and propose changes to multiple files
  2. Review the proposed changes in the diff view
  3. Check the Preview Canvas to see the updated UI

What Happened?

  • Agent Mode identified all files with favorite functionality
  • It updated icons consistently across LandmarkRow, LandmarkDetail, and other views
  • Changes were made simultaneously across multiple files

Try More Complex Tasks (Optional)

  • Add a rating system (1-5 stars) to landmarks with mock data
  • Implement a dark mode toggle in the settings view
  • Add categories filter chips at the top of the landmark list

✅ Part 4 Complete!

You've learned how to:

  • Use Agent Mode for multi-file refactoring
  • Review proposed changes in the diff view
  • Verify changes with the Preview Canvas