ios - iOS4 iPhone turn screen off, keep accelerometer on -

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i know has been asked before, answers see 2 years back. i'll rephrase question: are there new power management apis in ios4 can take advantage of turn off screen?

-overlaying black view on top of existing view still drives screen's backlight , refresh rate.

can let device screen timeout , run app in background? need collect accelerometer data.

thank you!

as far know can't collect accelerometer data while phone locked. there no power management apis.

i found tho give trick of using proximity sensor doesn't seem reasonable solution. enable iphone accelerometer while screen locked


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