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Learning Xcode 8

You're reading from   Learning Xcode 8 Learn to build iOS Applications with Xcode 8

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Product type Paperback
Published in Nov 2016
Publisher Packt
ISBN-13 9781785885723
Length 480 pages
Edition 1st Edition
Languages
Tools
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Author (1):
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Jak Tiano Jak Tiano
Author Profile Icon Jak Tiano
Jak Tiano
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Toc

Table of Contents (18) Chapters Close

Preface 1. Starting Your iOS Journey FREE CHAPTER 2. Welcome to Xcode 3. Introduction to Swift 3 4. Using Storyboards, Auto Layout, and Size Classes 5. Taking Advantage of Source Control in Xcode 6. Building Your First iOS App 7. Integrating Multitouch and Gestures 8. Exploring Common iOS Frameworks 9. Working with Core Data 10. Creating a watchOS Companion App 11. Advanced Input Using Sensors 12. Sending Notifications 13. Writing Unit Tests 14. Debugging an iOS Application 15. Optimizing Your App 16. Distributing an iOS App Index

Visual debugging

As app development has become more and more visual with the use of storyboards, we, as developers, have an increasing number of places that things can go wrong outside of our actual code. In the last chapter we looked at how UI tests allow us to test user interaction scenarios, but we can also debug our interfaces when things go wrong. To do that, we're going to use Xcode's View Debugger.

When we were looking at the debug toolbar earlier in the chapter, we looked at the View Debugger button, but didn't use it. (It's the one that looks like three rectangles.) Let's build and run our project, and then click it to launch the View Debugger:

Visual debugging

Figure 14.26: The View Debugger paused on a frame of our Snippets app

So what just happened? Xcode paused our app, and then loaded the entire view hierarchy into the editor. Along the left side of the screen (in the debug navigator) we can see all of the UI elements in their hierarchy, much like the document outline...

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