applicationWillResignActive and setBrightness not working?

Question

I use [[UIScreen mainScreen]setBrightness: ] (in sdk 5.0) to change the system background light in my app.

The following steps work with my app:

1. Act

Answer 1

Since the current methods don't work in the app delegate methods, you can use a UIView as described by Adam.

Make a UIView lvar in the delegate h file:

UIView *view_;

Then in the implementation:

// create view in app delegate didFinishLaunchingWithOptions method and add it to the window
view_ = [[UIView alloc] initWithFrame:self.window.frame]; // delegate lvar
[view_ setBackgroundColor:[UIColor blackColor]];
[view_ setAlpha:0.5];
[self.window addSubview:view_];
[self.window makeKeyAndVisible];
return YES;

Make the view the size of your screen or view controller as needed. and make sure it's on top of all other subviews.

Keep in mind this will have a significant affect on the graphics performance of the app, but unless you are doing something crazy with the UI, it should be okay.