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Core Data

  • -com.apple.CoreData.SQLDebug 1-3 - print all SQL queries called by Core Data
    • -com.apple.CoreData.Logging.stderr 1-3 - needed alongside with the SQLDebug from iOS 10+ because of new logging system, more on that in changelog
  • -com.apple.CoreData.SyntaxtColoredLogging YES - probably syntax colored logging (not tried)
  • -com.apple.CoreData.SQLiteDebugSynchronous 1 - preference controls some aspects of the SQLite store. See the "Configuring a SQLite Store's Save Behavior" section of the Core Data Programming Guide for details
  • -com.apple.CoreData.SQLiteIntegrityCheck 1 - the SQLite store does extra integrity checking
  • -com.apple.CoreData.MigrationDebug 1 - Core Data will log information about exceptional cases as it migrates data
  • -com.apple.CoreData.ThreadingDebug - preference enables assertions to enforce Core Data's multi-threading policy. It is a number, where increasing values enable more debugging. A value of 3 is recommended. This feature requires the debug variant of the framework

UI

  • -NSDoubleLocalizedString YES - doubles the length of every localized string
  • -UIViewShowAlignmentRects YES - shows alignment rects in UI
  • -NSForceRightToLeftWritingDirection YES - simulates right-to-left language
  • -UIStateRestorationDebugLogging YES

Cocoa

  • NSAssert(getenv("NSZombieEnabled"), @"Braaainz (also turn off zombies") - just memo for turn off zombies

Localizations

  • -AppleLocale cs_CZ - starts app with selected locale
  • -AppleLanguages (en) - starts app with selected locale
  • -NSShowNonLocalizedString YES - probably show strings without applied NSLocalizedString (not tested)

Swift

  • -Xfrontend -debug-constraints - gory details of what the type checker's thinking (use on compiler)

Xcode

  • defaults write com.apple.dt.Xcode ShowBuildOperationDuration YES
@clementpadovani
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Does -com.apple.CoreData.ThreadingDebug work? If so I can’t seem to get it to work, is the Core Data debug framework still available?

Thanks

@beny
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beny commented Jul 5, 2014

Not all of these flags currently works or are testes. It's just a list which I discovered somehow or somewhere. I think that Core Data debug framework isn't updated by Apple so often so it's possible that it does not work.

@victor
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victor commented Feb 1, 2015

I think it is called -com.apple.CoreData.ConcurrencyDebug nowadays.

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