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POCan't set background colour for UIView from ViewController
 

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    <p>I have the following code in the view controller:</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; ThemeManager *themer = [ThemeManager sharedInstance]; UIView *theView = self.view; UIColor *forBackground = [themer backgroundColour]; [theView setBackgroundColor:forBackground]; } </code></pre> <p>but when execution gets to the setBackgroundColor line, I get the following error:</p> <pre><code>*** -[NSCFNumber CGColor]: unrecognized selector sent to instance 0x1237c40 *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFNumber CGColor]: unrecognized selector sent to instance 0x1237c40' </code></pre> <p>There's got to be something simple that I'm doing wrong, how do I set the background colour?</p> <p>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.</p> <p>Update: value returned by <code>[themer backgroundColour]</code> is constructed using <code>colorWithPatternImage:</code>, could this make a difference?</p> <p>Update: if I use a value in my ThemeManager that was constructed using colorWithRed:green:blue:alpha:, that it works OK. Is there any way to do this using a color with a background image? The following works OK:</p> <pre><code>[theView setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"myimage.png"]]]; </code></pre> <p>Update: this works OK too:</p> <pre><code>UIColor *forBackground = [UIColor colorWithPatternImage:[UIImage imageNamed:@"myimage.png"]]; [theView setBackgroundColor:forBackground]; </code></pre> <p>In my original example, the object returned from <code>[themer backgroundColor]</code> was a <code>UIColor</code>, so what's the problem?</p> <p>When I step through with the debugger:</p> <pre><code>UIColor *forBackground = [themer backgroundColour]; </code></pre> <p>results in <code>forBackground</code> being of type <code>NSConstantValueExpression *</code></p> <p>and</p> <pre><code>UIColor *forBackground = [UIColor colorWithPatternImage:[UIImage imageNamed:@"myimage.png"]]; </code></pre> <p>results in <code>forBackground</code> being of type <code>UIDeviceRGBColor *</code></p> <p>Here is the code for the ThemeManager's backgroundColour method:</p> <pre><code>- (UIColor *)backgroundColour { if (backgroundColour == nil) { backgroundColour = [UIColor colorWithPatternImage:[UIImage imageNamed:@"myimage.png"]]; } return backgroundColour; } </code></pre> <p>backgroundColour is also the name of an instance variable.</p>
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