Change to wantsSoftwareDimming in iOS 6?

问题:

This is regarding the question: Turn off display in iPhone OS (iOS)

As alternative to turning off display, I am looking for a way to dim screen as much as possible.

I found following questions:

How to change brightness in iOS 5 app?

Make the iPhone Screen Dim

And this documentation:

http://developer.apple.com/library/IOs/#documentation/UIKit/Reference/UIScreen_Class/Reference/UIScreen.html

Per this questions/documentation, I should be able to do this to dim screen additional to decreasing backlight.

 [[UIScreen mainScreen] setWantsSoftwareDimming:YES];

I tried this code on my iPad 2 (iOS 6.0). However, I didn't notice any change in brightness of display.

a) Am I doing something wrong?

b) Were there any changes in iOS regarding this?

回答1:

setWantsSoftwareDimming: won't on itself do anything to the screen. It will instead change the scale that the brightness property of UIScreen uses. You should be calling it before you call setBrightness:. Perhaps if you post the method in which you set the brightness / call setWantsSoftwareDimming you might get some more useful feedback?