Find Usages lets you quickly see all the places where a symbol (class, method, property, variable, etc.) is used. Unlike textual search, Find Usages in AppCode works on the semantic level and shows you actual usages, not just text matches. Moreover, it understands and can be used with localization, Core Data and xib files.
Finding usages
Just press Alt + F7 and get a list of references grouped by type of usage, module and file. The first results are displayed immediately. When you have a huge project, more results appear as the IDE finds them.
By default the results are not grouped