Before you can browse a project's class hierarchy or search a project, the project must be indexed.
To update a project's index automatically when the project is opened and when a file is saved:
If these options are on, Project Builder keeps your project's index up-to-date without your needing to do anything. However, this can slow down other applications running on your computer. If performance is an issue, fine-tune your indexing preferences. See Advanced Indexing Techniques for more information.