Changing the background color of a UIAlertView?

Question

I want to change the background color of my UIAlertView, but this doesn\'t appear to have a color attribute.

Answer 1

I don't believe that there is an exposed method or property for doing this. Setting the backgroundColor of the UIAlertView (as a UIView) merely puts a colored rectangular backdrop behind the alert view.

I'd say that it would probably go against the common interface of the iPhone to alter this color, so I don't think it's recommended behavior (in the same way that changing the background color of an alert view in Mac OS X is not recommended).

Answer 2

Add QuartzCore framework to the application and include #import "QuartzCore/CALayer.h" in the source file.

Answer 3

This looks like the most robust solution to me

http://mobile.tutsplus.com/tutorials/iphone/ios-sdk-uialertview-custom-graphics/

Answer 4

I recently found the GRAlertView, which allow you to tailor UIAlertView in an easy way that at least I like. You find it here: https://github.com/goncz9/GRAlertView

Answer 5

I've also find an almost identical workaround and, in my case, it works better. Using oxigen way out i've discovered a poor result on the screen and the context get blurred. Rather than subclassing UIAlertView I implement:

- (void)willPresentAlertView:(UIAlertView *)alertView;

so...just copy & paste

- (void)willPresentAlertView:(UIAlertView *)alertView 
{
    blah blah blah...
    [[alertView layer] setContents:(id)theImage.CGImage];  // to avoid the warning
}

Answer 6

Background of AlertView is an image And you can change this image

UIAlertView *theAlert = [[[UIAlertView alloc] initWithTitle:@"Atention"
   message: @"YOUR MESSAGE HERE", nil)
   delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] autorelease];

   [theAlert show];

   UILabel *theTitle = [theAlert valueForKey:@"_titleLabel"];
   [theTitle setTextColor:[UIColor redColor]];

   UILabel *theBody = [theAlert valueForKey:@"_bodyTextLabel"];
   [theBody setTextColor:[UIColor blueColor]];

   UIImage *theImage = [UIImage imageNamed:@"Background.png"];    
   theImage = [theImage stretchableImageWithLeftCapWidth:16 topCapHeight:16];
   CGSize theSize = [theAlert frame].size;

   UIGraphicsBeginImageContext(theSize);    
   [theImage drawInRect:CGRectMake(0, 0, theSize.width, theSize.height)];    
   theImage = UIGraphicsGetImageFromCurrentImageContext();    
   UIGraphicsEndImageContext();

   [[theAlert layer] setContents:[theImage CGImage]];