Question about UIWindow backgrounds

I have written a powerful开发者_JS百科 trig calculator, but I want to use the "linen" background. I have been able to implement this in interface builder, but I get a 'yellow triangle' warning in Xcode that says it is not compatible with something like iOS 3.2 and earlier. And I'm afraid Apple will reject it if says that. I want to know the code that I can use to change both the text color (from black to white) and the background texture (from blue and white vertical stripes to the darker linen). I already know a few ways to test and apply info about the users current firmware version, but I'm always open to suggestions. Any help will be GREATLY APPRECIATED!!! I have just read the first 3 answers and duh I feel kinda stupid, that makes sense. But I would also like to know how to do this and make it like a user configurable "setting" just to make it feel nicer :-) thanks

The linen background is a tiling UIColor. You can create a tile color programmatically and apply this tiled background anywhere you would set a backgroundColor. Even on UIWindow.

If you want to maintain compatibility to old iOS versions, replace the built in background "color" (such as linen) with an UIImageView showing an image of it.

Write a simple app, filling the entire screen with the background, make a screenshot, then place it behind all other UI elements.