14.5. Summary

Xcode provides an extensive range of debugging tools and integrates well with a number of open source tools. The technology behind Instruments is mostly open source, and its ease of use and visual nature permitting exploration and interpretation of captured data is unrivaled.

Debugging applications that you’ve deployed via the iTunes App Store requires additional forethought if you want to maximize your ability to diagnose crashes that you yourself can’t replicate. At a minimum, you should archive a copy of your source code and debugging symbols (*.dsym files) for each update of the application you submit. Doing so increases your chances of being able to quickly zero in on probable causes of crashes that occur “out in the wild.”