Step 2: Habit List

Display habits and add new ones.

Where We Are

You have a basic app shell. Now let's build the habit list.

Create the Data Model

Create a Habit model with:
- An ID (UUID)
- A name (String)
- A creation date

Use a simple Swift struct that conforms to Identifiable.

Display a List

Replace the "No habits yet" placeholder with a SwiftUI List.
- If there are no habits, show "No habits yet. Tap + to start."
- If there are habits, show each one by name
- Add a toolbar button (+) to add new habits

Add New Habits

When the user taps +, show a sheet with:
- A text field for the habit name
- A "Save" button that adds the habit and closes the sheet
- A "Cancel" button that closes without saving
- Don't allow saving if the name is empty

Test It

1. Run the app
2. Tap + to add a habit
3. Type "Drink water" and save
4. Add a few more: "Exercise", "Read", "Meditate"
5. You should see them in the list

The data won't persist yet — if you restart the app, the habits disappear. That's fine for now.

Checkpoint

By now you should have:

• Habit list displays correctly
• Can add habits via the + button
• Sheet appears with text input
• Empty names are rejected

What You Learned

• SwiftUI List and ForEach
• Sheets and modal presentation
• State management with @State
• Data modeling with structs

Exercises

1. Paste the three prompts in order (model → list → sheet), then run the app and add "Drink water", "Exercise", "Read", and "Meditate".
2. Test the empty-name rule: open the add sheet, leave the field blank, and confirm the Save button won't add a habit.
3. Restart the app and watch the habits disappear — note this gap; you'll fix it in Step 5 (Persistence).