问题
I have an iOS 7 app where I want to make the screen darker. I am adjusting the screen brightness using the following line:
[UIScreen mainScreen].brightness = 0.3;
This dims the screen as I expect, but if a user has auto brightness enabled the screen sometimes goes back to its original setting. Is there a way to disable auto brightness while in my app, or do I need to subscribe to the UIScreenBrightnessDidChangeNotification notification and just reset the brightness each time it is raised?
回答1:
You cannot disable the auto brightness at all, so you will have to subscribe to the notification. Read more about available methods in UIScreen:
https://developer.apple.com/library/ios/documentation/uikit/reference/UIScreen_Class/Reference/UIScreen.html#//apple_ref/occ/instp/UIScreen/brightness
How to turn off Auto-Brightness programatically?
- Does iOS send notifications when the system changes the screen brightness?
来源：https://stackoverflow.com/questions/22738277/ios-7-auto-brightness-is-overruling-apps-screen-brightness-setting