Is there a way to set a custom states -- not one of the existing UIControlState values -- for a UIControl?

In the UIControlSate enum, there are 16 bits that can be used for custom control states:

UIControlStateApplication  = 0x00FF0000,              // additional flags available for application use

The problem is that UIControl's state property is readonly.

I want to set different background images to my UIButton for custom states.

ios objective-c cocoa-touch uicontrol
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