Xcode tips

gistfile1.md

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

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

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.

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