I have an iPhone app for photographic purposes (kind of a lightbox). This app needs as much brightness as possible. Is there a way to change the screen brightness programmatically, and then restore it back some time later?
+5
A:
No, this capability is not exposed via public APIS.
Edit: Note that a future possible iOS release may or may not have screen brightness on the multitasking bar on one particular iDevice.
coob
2010-09-23 15:02:10
While I too can't say whether that is the case or not due to a certain agreement I have regarding the disclosure of proprietary information... it is certainly the case that the major third-party "reader" apps contain brightness sliders. So whether or not it's exposed, people are doing it, and it's flying with the app store reviewers.
Dan Ray
2010-09-23 19:48:30
They're adjusting the colours of the background of the text, not the actual screen brightness.
coob
2010-09-24 08:25:00
+1
A:
It is possible, but your app will most likely get rejected from the App Store, because it uses a private API. A flashlight-app was rejected because it adjusted the screen brightness, so I wouldn't recommend it.
In iOS 4.2, the iPad will have a screen brightness-adjuster in the multitasking-bar,
(as mentioned by @coob) so you could tell your users to set the brightness there.
What you could do, is to create a black overlay-view, and set it's alpha to more or less, according to how bright you want the screen to be. This won't actually make the screen less/more bright, but it will give the user an illusion of that.
Emil
2010-09-23 18:15:55