I have the following code in the view controller:

- (void)viewDidLoad {
    [super viewDidLoad];
    ThemeManager *themer = [ThemeManager sharedInstance];
    UIView *theView = self.view;
    UIColor *forBackground = [themer backgroundColour];
    [theView setBackgroundColor:forBackground];
}

but when execution gets to the setBackgroundColor line, I get the following error:

*** -[NSCFNumber CGColor]: unrecognized selector sent to instance 0x1237c40
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFNumber CGColor]: unrecognized selector sent to instance 0x1237c40'

There's got to be something simple that I'm doing wrong, how do I set the background colour?

Do I have to subclass the view and do it in there? I'd prefer not to have the extra class, even though that is better separation of the whole model/view/controller thing.

Update: value returned by [themer backgroundColour] is constructed using colorWithPatternImage:, could this make a difference?