The debugger enables you to debug apps by showing you values of variables and other useful information. See how it works in this wonderful movie!
- [Teacher] Let's look at how…the debugger works in Xcode.…Of course if you're going to be debugging,…you need to make sure that your scheme…is set to Run the Debug Build Configuration…in the Run settings in your scheme.…Now this is the default configuration,…so it should be fine.…Just make sure it's running the…appropriate configuration and that…Debug Executable is checked.…So here on our screen, we have some simple code.…I'm declaring an optional, setting the optional to nil…printing out the optional's value…and force unwrapping it and grabbing a property.…
It builds just fine if you press CMD B,…but if you run the application,…the app crashes because we're…trying to get a property of a nil object.…If we're just looking in the editor,…we get some really poor information…about what the problem is.…We see this EXC_BAD_INSTRUCTION.…It doesn't tell us anything.…We have the debug navigator to navigate through this,…and we can see our thread hierarchy…so we can open up the various threads.…
And if we open up thread one,…
Author
Todd Perkins
Released
11/18/2016These Xcode tutorials help new developers install Xcode and start writing and editing code. Instructor Todd Perkins shows how to build a brand-new user interface (UI) with buttons and menus in Interface Builder, Xcode's intuitive UI design tool, as well as advanced designs that adapt to screen size, aspect ratio, and orientation changes. He reviews the version control and storyboard features, as well as the basics of schemes and behaviors. Plus, learn how to compile and debug apps, test apps in the iOS Simulator, and send your app to Apple for distribution in the App Store.
- What is Xcode?
- Installing Xcode 8
- Creating your first Xcode project
- Editing code
- Creating snippets
- Adding Git version control
- Making interface connections to the code
- Using Interface Builder
- Creating storyboards
- Pinning objects
- Compiling code with the LLVM compiler
- Working with schemes and behaviors
- Sharing resources in a workspace
- Catching common errors with Analyze and Fix-It
- Using the iOS Simulator
- Preparing an app to be published
Skill Level Beginner
Duration
Views
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Introduction
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Welcome47s
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1. Getting Started
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What is Xcode?1m 57s
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Install Xcode 840s
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Explore the user interface4m 59s
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Use tabs2m 2s
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Open files quickly1m 9s
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View the Xcode documentation2m 14s
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Use the Quick Help inspector1m 52s
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Import assets4m 57s
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2. Edit Code
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Create snippets4m 6s
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Use the Symbol Navigator2m 48s
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Prototype in a playground3m 44s
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3. Version Control
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Commit changes2m 34s
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4. Interface Builder Basics
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Explore Interface Builder5m 58s
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Use the Identity Inspector5m 33s
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Use the Attributes Inspector3m 55s
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Use the Size Inspector2m 45s
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5. Storyboards
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Understanding pinning7m 16s
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Modify pins3m 26s
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6. Compiling
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Work with schemes3m 1s
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Use behaviors1m 51s
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7. Debugging
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Use the debugger3m 42s
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Work with breakpoints3m 15s
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8. Workspaces
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Create a workspace4m 18s
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9. Static Analysis Tools
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Correct errors with Fix-it1m 54s
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Use the Analyze tool1m 48s
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10. The iOS Simulator
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11. Publishing Apps
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Send an app to Apple2m 40s
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Conclusion
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Next steps1m
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Video: Use the debugger