Debugging Tips and Tricks - iOS Conf Singapore 2015
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The slides from the presentation I did at iOS Conf 2015 in Singapore on October 24th. The presentation deals with tips and tricks for debugging iOS applications.
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Debugging Tips and Tricks - iOS Conf Singapore 2015
- 1. Bugs are what we *thought* we told the computer to do vs. what we actually told the computer to do - Javier Soto, iOSConf Singapore 2015
- 3. Do you do debugging on a regular basis?
- 4. Do you love debugging?
- 5. Developing for iOS is complicated • Multiple platforms - iOS, watchOS, tvOS Multiple devices - iPhone, iPad, Apple Watch, Apple TV Apps vs. extensions
- 7. September 9, 1947 First Instance of Actual Computer Bug Found
- 10. Test on Device! Don’t rely on just the simulator for all your testing. If you notice a bug (or strange behaviour) on the simulator, test on a device (or several devices) too. Some issues are there just on the simulator and this can cause you many wasted hours.
- 11. Me, after hours of Simulator Debugging
- 12. Trust in the Google Search to see if others have encountered the issue. In most cases, they probably have. If you’re working with a beta version of iOS/Xcode, the Apple developer forums (http://forums.developer.apple.com/) will almost always have somebody else talking about the issue.
- 13. What Changed? Version control systems are your friend - they can help you identify what actually changed when you did that last revision Compare versions to see if you can identify the change that is causing the bug you see.
- 14. Git Outta Here Git isn’t just for the command-line any more! • Xcode - Built-in source control functionality. • SourceTree - Free. Works with both Git and Mercurial repositories. http://sourcetree.com • GitUp - Free. Allows you to do some complicated operations via the GUI. http://gitup.co • GitHub Desktop - Free. Integrates with GitHub workflow. https://desktop.github.com • Git Tower - Paid. Beautiful, clean, and functional UI. http://git- tower.com
- 15. Crash Logs Crash logs provide a lot of valuable information to identify the root cause for a bug. Third party tools can help too: • Crashlytics/Fabric - Tiny footprint, easy to set up. Now owned by Twitter. http://fabric.io • Hockey - Multi-platform - Android, iOS, Windows, Unity. Now owned by Microsoft. http://hockeyapp.net
- 16. Pare it Down! Have a bug in a complicated project? Simplify it! Clone and reduce the project down to the simplest form possible where the bug is still present.
- 17. Basic Xcode Debugging • Break points - The basic tool of debugging • Logging - Get rid of all those NSLog statements … • Watch points - How do you know when a variable changes? • Symbol breakpoints - Break on specific methods. • Exception breakpoints - Catching those elusive crashes
- 19. Conditional Breaks Break on specific iterations or conditions by adding a condition to the breakpoint
- 20. Threads Thread debugging - how do you debug interactions between multiple threads?
- 21. Views View debugging - what do you do?
- 22. Views View debugging - a better way? Reveal app - http://revealapp.com
- 23. Autolayout Autolayout constraint issues - how do you debug?
- 25. Questions? More questions? Or need help with debugging? Or want to discuss debugging related stuff? Contact me via e-mail at: fahim@rooksoft.sg Or on Twitter: @FahimFarook