我有一个我的博客上的条目涵盖了这个确切的主题。

I have an entry on my blog which covers this exact topic.

它提供了有关如何在Xcode 4中启用GCOV以及如何使用CoverStory显示结果的分步指南。

It provides a step-by-step guide on how to enable GCOV in Xcode 4 as well as how to use CoverStory for displaying the results.