For one of my apps I currently allow for custom themes if the client makes a request (which they usually do, as it's a branded application). Sometimes this can be as simple as simply changing the colour scheme so I was wondering if there was a way to simplify the process. For example, if I had a class named ColourStyle and I specified its colour property values and then imported it to other classes, could I simply set it up so all I have to do is edit this one class and the others will naturally base their colours on whatever value is set in ColourStyle?
Would this be feasible, or is there a much easier way?
One of the ways of doing this is that you adapt the new Appearance API. http://developer.apple.com/library/ios/#documentation/uikit/reference/UIAppearance_Protocol/Reference/Reference.html
There's a good talk and slides about this if you log in to the apple's developer portal; Search for advanced ui customization.