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    <ol> <li><p>UIView as created opaque by default. When you set the backgroundColor to a pattern with transparency it is choosing black as the background color. You can set <code>customViewController.view.opaque = NO;</code> to allow the background of the view behind yours to show through.</p></li> <li><p>When you set the backgroundColor of the layer to a pattern with transparency you are bypassing the UIView logic, so the opaqueness of the view is ignored; so also is the the UIView's transform. CoreGraphics and friends use a coordinate system where the positive y-axis points upwards. UIKit flips this coordinate system. This is why the image appears upside down. </p></li> <li><p>If you add labels/views/buttons/etc. the will appear correctly on top of the layer's background pattern.</p></li> <li><p>When you set the view's background color it appears as if the layer's background color is indeed set. (I have not seen this documented anywhere).</p></li> </ol> <p>Essentially the UIKit's UIView stuff is a high-level interface which ends up rendered onto layers. </p> <p>Hope this helps.</p> <p>EDIT 5/7/2011</p> <p>You can get the image to show the right way up by flipping the layer's coordinate system BUT you shouldn't do this to view.layer; UIKit doesn't expect you to mess with this layer, so if your flip its coordinate system any UIKit drawing will be flipped; you need to use a sublayer.</p> <p>So your code would look like this:</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; customViewController = [[CustomViewController alloc] init]; customViewController.view.frame = CGRectMake(213, 300, 355, 315); CALayer* l = [CALayer layer]; l.frame = customViewController.bounds; CGAffineTransform t = CGAffineTransformMake(1.0f, 0.0f, 0.0f, -1.0f, 0.0f, 0.0f); l.affineTransform = t; l.backgroundColor = [[UIColor alloc] initWithPatternImage:[UIImage imageNamed:@"login_background.png"]].CGColor; [customViewController.view.layer addSublayer:l]; [self.view addSubview:customViewController.view]; } </code></pre> <p>Note: normally when you flip coordinates you include the height. For layers you don't need to do this. I haven't dug into why this is so. </p> <p>As you can see there is a lot more code involved here and there is no real advantage to doing it this way. I really recommend you stick to the UIKit approach. I only posted the code in response to your curiosity. </p>
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    1. COidz, thank you so much for the clear explanation. I guess I will set the background image for UIView and change the opaque setting for now.
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    2. COYou're welcome!
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    3. COCurious, how do you fix the y-axis if you were to use layer instead of view?
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