Unable To Reset Brightness On Application Exit

Question

Why can't I set screen brightness in applicationDidEnterBackground or applicationWillResignActive?
This is my code:
- (void) applicationDidEnterBackground : (UIApplication *)application) {
[[UIScreen mainScreen] setBrightness:1.0];
Can't understand it...!? It works in applicationDidEnterForeground etc, just not when i close the app using the home button.
Is there any other solution to this problem?
Thanks to anyone that can help..

Answer 1

Hi Michael,
Thanks for the quick reply.
This is not the actual issue. I was trying to set the screen brightness in my application,and was able to do that,so when our application is minimised by pressing the home button or exiting the application should revert the screen brightness to the default one. Currently when i set the screen brightness the whole device brightness is changed but not reverting back to the default one when the application is minimised or exit.
I have tried to reset the brightness to the default one in the function :
- (void) applicationDidEnterBackground : (UIApplication *)application) {
[[UIScreen mainScreen] setBrightness:1.0];
this function is executing correctly but the brightness is not resetting,the previous value we have set is sustaining.