Would it be in the .h or .m and how do I do this?
The .h—“header”—file is usually where information about your class goes... its structure, “what it does” rather than “how it does it”. The .m is thus probably the right place, but it'd help for you to go into more detail about how your UI is set up. Are you using Interface Builder or creating the UIProgressView programmatically? Is the class a view, a view controller, the application's delegate, or what?