Dim iPhone Screen, but don't let it sleep

Question

Update

https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIScreen_Class/index.html#//apple_ref/occ/instp/UIScreen/brightness

That\'s the Ap

Answer 1

I'm pretty sure there's nothing in the official SDK.

[(id)[UIApplication sharedApplication] setBacklightLevel:0.3f]; // or whatever value

works, but is of course undocumented. The recent experience with UIGetScreenImage indicates that perhaps the right strategy with useful but undocumented APIs is to use them and see what happens.

Failing that, has anybody ever measured if the phone's power consumption goes down if it's showing a black image, or does it not help unless you can turn down the backlight?