In this chapter, you saw that, despite reducing errors at precompile time, errors can still slip in and crash or prevent your code from doing what is expected. Apple provides a powerful debugger and features that allow you to debug your code, both visually and functionally. You also saw how you can create custom Quick Look previews for your own classes. Lastly, you also received a brief introduction to the debug console and its commands. For the scope of this book, we had a brief look at the relevant features in Xcode that you might use for debugging. Debugging by itself is vast and can warrant an entire book.

In the next chapter, we will compile and package everything to create our application ready for deployment to the testers or the store.