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iPhone app development: Can I programmatically change the screen brightness?

Posted on 2009-05-08
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Last Modified: 2012-05-06
Hi all,

So I just added a UIActivityIndicator to my app. It works fine but it's not very flashy and there's not always a great place for it on the screen. So, what I would like to do is to make the entire screen much darker and then put the activity indicator right in the middle, as I know I've seen that elsewhere.

Does anyone know of a way to do this?

Thanks for any suggestions?
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Question by:ehensens
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4 Comments
 

Expert Comment

by:allentheg
ID: 24339234
You can do this easily by using the interface builder. Double-click on the .xib file that you are working on, and the interface builder will load up. From there, you will see a white rectangle. This is where you can items into your iphone app and it will show up when you run it. You can change the background of the view to a darker color. You can also drag and drop your UIActivityIndicator into the middle of your interface.
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Author Comment

by:ehensens
ID: 24339251
The problem is I need to change this from my code, it needs to go darker when I load up the indicator and then back to normal when the indicator is turned off.
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Accepted Solution

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inbox788 earned 500 total points
ID: 24339405
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Expert Comment

by:allentheg
ID: 24339406

-(void)hideActivityViewer

{

	[[[activityView subviews] objectAtIndex:0] stopAnimating];

	[activityView removeFromSuperview];

	activityView = nil;

}

 

-(void)showActivityViewer

{

	[activityView release];

	activityView = [[UIView alloc] initWithFrame: CGRectMake(0, 0, window.bounds.size.width, window.bounds.size.height)];

	activityView.backgroundColor = [UIColor blackColor];

	activityView.alpha = 0.5;

	

	UIActivityIndicatorView *activityWheel = [[UIActivityIndicatorView alloc] initWithFrame: CGRectMake(window.bounds.size.width / 2 - 12, window.bounds.size.height / 2 - 12, 24, 24)];

	activityWheel.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhite;

	activityWheel.autoresizingMask = (UIViewAutoresizingFlexibleLeftMargin |

									 UIViewAutoresizingFlexibleRightMargin |

									 UIViewAutoresizingFlexibleTopMargin |

									 UIViewAutoresizingFlexibleBottomMargin);

	[activityView addSubview:activityWheel];

	[activityWheel release];

	[window addSubview: activityView];

	[activityView release];

	

	[[[activityView subviews] objectAtIndex:0] startAnimating];

}

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