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Mastering iOS 11 Programming - Second Edition by Donny Wals

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Exploring the Instruments suite

In this book's Git repository, you'll find a project named Instrumental. The app is still in its early stages of development, so there is plenty of work that needs to be done to improve the app. Some implementations are not ideal and the app contains some placeholders that might not make a lot of sense.

Even though the app isn't finished and the code isn't perfect, the app should be working fine, especially in the performance department. If you launch the app and click around, you'll notice that the app isn't working fine. It's actually really slow! Let's see if we can find the issue that's making the app slow.

If you dig through the source code, you'll immediately see that the app has three main screens: a ...

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