adjusting screen brightness

[Domele]

The method was only introduced in iOS 5, there is no way to truly adjust the screen's brightness in iOS 5-.

[bailon]

Originally Posted by jimmyyjlee

hi
can you tell me which method can adjust brightness if iOS 4.x, 3.x ?
thank you

jimmy

You get the brightness:
float fBrightness = [UIScreen mainScreen].brightness;

and you set the brightness
[[UIScreen mainScreen]setBrightness:fBrightness];

The values are from 0 to 1

[Domele]

Those methods were only introduced in iOS 5.0. There is no way to truly adjust the screen brightness pre iOS5. The only way is to artificially do it by layering a UIView object with a black background and lowering the opacity.

[bailon]

Originally Posted by Domele

Those methods were only introduced in iOS 5.0. There is no way to truly adjust the screen brightness pre iOS5. The only way is to artificially do it by layering a UIView object with a black background and lowering the opacity.

Domele, you are absolutely right. These methods are only present in iOS 5 anybody using a previous iOS version should check for the presence of this method by using:

if([[UIScreen mainScreen] respondsToSelector:@selector(setBrightness])
[[UIScreen mainScreen]setBrightness:fBrightness];