GymTimerPro

GymTimerPro is an iOS (SwiftUI) app to track rest periods between gym sets: set the total number of sets and the rest duration, then start a simple countdown.

Features

• Configure total sets and rest duration.
• On-screen countdown updated every second.
• Live Activity (Lock Screen / Dynamic Island) with current set, remaining time, and mode.
• Hold-to-reset button (prevents accidental resets).
• Timer persistence (UserDefaults) to keep state across background/foreground.
• Keeps the screen awake while the app is open (disables the idle timer).

Live Activities / Notifications

• The widget (ActivityKit) shows the countdown on the Lock Screen and Dynamic Island (device support required).
• If Live Activities are unavailable or fail, the app attempts to schedule a local notification when the rest ends (notification permission required).

Requirements

• Xcode 16+ recommended.
• iOS 18.4 (current deployment target).

Running the app

1. Open GymTimerPro.xcodeproj in Xcode.
2. Select the GymTimerPro scheme.
3. Run on a simulator or device.
4. (Optional) Allow Notifications and enable Live Activities in Settings.

Project structure

• GymTimerPro/ContentView.swift: main UI and timer model (RestTimerModel).
• GymTimerPro/LiveActivityManager.swift: Live Activity handling + local notification fallback.
• Shared/GymTimerLiveActivityAttributes.swift: shared types (GymTimerAttributes) for app and widget.
• GymTimerProWidget/GymTimerProWidget.swift: Live Activity UI (Lock Screen + Dynamic Island).

Author

Alejandro Esteve Maza — https://alejandro-esteve.com