Question

I am using slider in my application and I want to change the background brightness as slider moves

When the nob is far left(-) the background image is only at 70% brightness and as I move slider nob
Brightness would adjust accordingly (ie. If the nob was in the middle the image would be at 85% brightness..)

I want to clear that I am developing my app in ios 5.

then How can I set brightness..

Answer 1

[[UIScreen mainScreen] setBrightness: yourvalue];

requires iOS 5.0 or later. yourvalue is a float between 0.0 and 1.0.

Set your slider value as per your need.