Appendix 1
Debugging on the Go

A good log often tells the story of a bug. What happened right before the bug appeared? What did the user expect to happen instead? Which classes are involved in the problematic part of the app?

In this appendix we’ll build a library that will allow you to check the log output within a running app. It’s important to make this library small and encapsulated so that you can use it in all your apps from now on. The apps we’ve built throughout this book are all apps that need to be tested outside. Seeing the log while you’re away from your Mac and Xcode will be very useful.