Ecodesign for Swift
| Version: 1.0.0 |
Rules: 5 |
Extensions: swift |
Ecodesign rules for Swift code: battery-aware background work, reused sessions, streamed data, no blocking of the main thread.
| Property |
Value |
| File |
skills/green-claude/rules/langages/swift.json |
| Globs |
**/*.swift |
| Extensions |
swift |
| Rule Count |
5 |
Rules by Category
Swift — device energy
On a phone the energy is the user’s battery, and the sensors are the expensive part (RGESN UX/Algorithms).
| ID |
Impact |
Title |
Recommendation |
| ECO-SW-01 |
High |
Sensor left running |
Stop the updates as soon as the screen or the task that needed them goes away, ask for the coarsest accuracy that works, and prefer significant-change monitoring over continuous updates. |
| ECO-SW-02 |
Medium |
Timer used to poll |
Drive the refresh from an event: a push notification, a WebSocket, a delegate callback. Where a timer is unavoidable, invalidate it when the view disappears and widen the interval. |
Example for ECO-SW-01
**Before:**
```
manager.startUpdatingLocation()
```
**After:**
```
manager.startUpdatingLocation()
// viewDidDisappear: manager.stopUpdatingLocation()
```
Swift — resources and I/O
Reuse sessions, stream large data, keep the main thread free (RGESN Backend/Frontend).
| ID |
Impact |
Title |
Recommendation |
| ECO-SW-03 |
High |
Main thread blocked |
Keep the main thread for the interface. Move the work to a background queue or an async task, and update the UI when it returns. |
| ECO-SW-04 |
Medium |
Whole file or response held in memory |
Use URLSession download or stream tasks, decode incrementally, and bound what you keep. |
| ECO-SW-05 |
Medium |
URLSession built per request |
Share one session for the app or the service, configured once with its cache policy and timeouts. |
Example for ECO-SW-03
**Before:**
```
DispatchQueue.main.sync { render() }
```
**After:**
```
Task { let d = await load(); await MainActor.run { render(d) } }
```