Jul 28

[iPhone] iPhone 3.0의 UIDevice를 이용한 Battery Level 모니터링에 대한 고찰

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Free memory와 함께 battery level에 관련된 app은 이슈 [1]가 많았습니다. IOKit library를 이용하는 경우 [2] (운 좋으면 피할 수 있겠으나) 애플에서 “undocumented 된 api의 사용” 이라는 이름 하에 reject을 했었습니다.

오늘 Mobile Orchard에서 3.0 new feature에 대한 튜토리얼에서도 UIDevice에서 3.0에서 추가된 batteryLevel property를 이용해서 Battery level과 Battery State를 모니터링 (aproximity monitoring)하는 것을 다루고 있듯이 [3] , iPhone 3.0에서는 Battery Level을 구하는 것이 문서화/공식화 되었습니다. 그래서 요즘 Battery 앱들이 많이 생겼구요 (예전엔 Free Memory App 정도였죠). Run Loop [4]에 있는 NSNotificationCenter [5] 까지 사용해서 거창하게 추가를 하긴 했죠.

하지만 (저도 앱을 만들어 테스트해봤지만) 모니터링 단위가 5%입니다. 그래서 충전 중이 아닌 상태에서도 오랫동안 100%로 표시됩니다.

2.X 대의 방식대로 iPhone의 IOKit library를 가져와서 [6] 간단히 앱을 만들어 테스트해보면 1% 단위로 정확하게 모니터링 할 수 있던데 왜 이것을 문서화/공식화 하지 않는지 모르겠습니다.

Ref

[1] Battery Percentage (MacRumors)

[2] Reading the battery level programmatically

[3] New In iPhone 3.0 Tutorial Series, Part 5: Battery Monitoring

[4] Run Loop Management

[5] NSNotificationCenter Class Reference

[6] [iPhone] 메모리 관리 Video 튜토리얼 – Memory Management Basics Tutorial Video

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