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High quality iOS development
- 1. High Quality iOS Development @robinlu IN-SRC Studio Saturday, April 9, 2011
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- 3. Topics • Memory management • Tools • Crash Reports • Test Saturday, April 9, 2011
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- 5. Memory Management alloc object +1 -1 copy reference release retain count 0 dealloc Saturday, April 9, 2011
- 6. Ownership Declare ownership Release ownership • create / copy • don’t need anymore • instance variable • dealloc of owner • container • multi-thread • ... Saturday, April 9, 2011
- 7. Autorelease • give the ownership to autorelease pool • default autorelease pool created by AppKit • life cycle = event cycle • You can create your own autorelease pool • Don’t over use autorelease Saturday, April 9, 2011
- 8. Problems • Memory Leak • Over-release Saturday, April 9, 2011
- 9. Rules You only release or autorelease objects you own • If you own the object by alloc, copy or retain, you have to release or autorelease • If the object is not owned by you, don’t call release or autorelease Saturday, April 9, 2011
- 10. Pitfalls • Implicit Onwership • Circular Reference Saturday, April 9, 2011
- 11. Implicit Ownership • NSTimer • Delayed performance of selector • Thread • IBOutlet Saturday, April 9, 2011
- 12. Circular Reference A A retains B B retains C C retains A C B Break it with weak references Saturday, April 9, 2011
- 13. General Practices • Instance Variables • Local Variables Saturday, April 9, 2011
- 14. Instance Variable get ownership in release ownership in init dealloc viewDidUnload viewDidLoad dealloc setter setter dealloc Saturday, April 9, 2011
- 15. Local Variable Always release or autorelease in the same scope Saturday, April 9, 2011
- 16. Summary • Ownership • Rules • Pitfalls • Practices Saturday, April 9, 2011
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- 18. Analyze • Clang Static Analyzer • More powerful than compiler warnings • Bug finder • memory leaks • dead store • logic error • ... Saturday, April 9, 2011
- 19. Memory Leaks Saturday, April9, 2011
- 20. Potential Memory Leak Saturday,April 9, 2011
- 21. Dead Store Value stored to ‘matchedRange’ during initialization is never read Saturday, April 9, 2011
- 22. Logic error Saturday, April9, 2011
- 23. Run Analyze Saturday, April9, 2011
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- 25. Instruments • Memory • Performance • ... Saturday, April 9, 2011
- 26. Memory • Memory Leaks • Abnormal Allocation • Heapshots • Over Release • Zombies • Memory Clean up • VM Tracker Saturday, April 9, 2011
- 27. Time Profiling • Sampling • Record Mode • Immediate mode • Deferred mode Saturday, April 9, 2011
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- 29. Crash Reports • What’s crash reports? • Where to get crash reports? • How to read crash reports? • Generate crash reports by 3rd party lib Saturday, April 9, 2011
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- 31. Xcode Organizer Get crash reports from devices Saturday, April 9, 2011
- 32. Local Directories • Mac OS X: ~/Library/Logs/CrashReporter/ MobileDevice/ <DEVICE_NAME> • Windows XP: C:Documents and Settings <USERNAME>Application DataApple Computer LogsCrashReporterMobileDevice <DEVICE_NAME> • Windows Vista + 7: C:Users<USERNAME> AppDataRoamingApple ComputerLogs CrashReporterMobileDevice<DEVICE_NAME> Saturday, April 9, 2011
- 33. iTunes Connect Get users’ crash reports after release Saturday, April 9, 2011
- 34. Crash Types • EXC_BAD_ACCESS (SIGBUS or SIGSEGV) • EXC_CRASH (SIGABRT) • Low Memory • 00000020 Exception Codes Type 0x8badf00d Timeout 0xdeadfa11 User Force-Quit Saturday, April 9, 2011
- 35. Symbols • Keep symbol before each release • Xcode Archive • dSYM file • Read the report • Xcode organizer • atos, symbolicatecrash, symbolizecrashlog • 3rd party tools - Symbolicator Saturday, April 9, 2011
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- 37. Test • Unit Test • Beta Test • Automating UI Test Saturday, April 9, 2011
- 38. Unit Test • Unit Test Target • How easy to test: M > C > V Saturday, April 9, 2011
- 39. Automating UI Test • Instruments • Accessibility • Javascript Saturday, April 9, 2011
- 40. Beta Test • Ad Hoc • Build suggestion: Ad Hoc and Distribution share the same bundle id but different from Debug build Saturday, April 9, 2011
- 41. Ad Hoc Deploy • Deploy via internet • Hockey • TestFlightApp.com • dropbox Saturday, April 9, 2011
- 42. Crash Report Lib • plcrashreporter • http://code.google.com/p/plcrashreporter/ • can be used in both ad hoc and distribution builds • output as protobuf-encoded messages Saturday, April 9, 2011
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