I've added an observer for an NSUserDefaults keyPath. This causes observeValueForKeyPath: to be called twice. Here's the call stack for the first call, starting from the setObject call (I'm actually calling setBool):
#0 0x0000000100007130 in -[AppDelegate observeValueForKeyPath:ofObject:change:context:] at /Users/tut/Projects/ButTunes/ButTunes/AppDelegate.m:505 #1 0x00007fffa196edbd in NSKeyValueNotifyObserver () #2 0x00007fffa196e654 in NSKeyValueDidChange () #3 0x00007fffa193d536 in -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] () #4 0x00007fffa0011825 in __47-[CFPrefsSource didChangeValues:forKeys:count:]_block_invoke () #5 0x00007fffa001166a in forEachObserver () #6 0x00007fffa001178c in -[CFPrefsSource didChangeValues:forKeys:count:] () #7 0x00007fffa00113cf in -[CFPrefsSource setValues:forKeys:count:removeValuesForKeys:count:] () #8 0x00007fff9fef5550 in -[CFPrefsSource setValues:forKeys:count:] () #9 0x00007fff9ff3e71a in -[CFPrefsSource setValue:forKey:] () #10 0x00007fffa00606a2 in __108-[_CFXPreferences(SearchListAdditions) withSearchListForIdentifier:container:cloudConfigurationURL:perform:]_block_invoke () #11 0x00007fffa0060519 in -[_CFXPreferences(SearchListAdditions) withSearchListForIdentifier:container:cloudConfigurationURL:perform:] () #12 0x00007fffa008c955 in -[_CFXPreferences setValue:forKey:appIdentifier:container:configurationURL:] () #13 0x00007fff9ff3e664 in _CFPreferencesSetAppValueWithContainer () #14 0x00007fffa1964bbf in -[NSUserDefaults(NSUserDefaults) setObject:forKey:] () And the second callstack: #0 0x0000000100007130 in -[AppDelegate observeValueForKeyPath:ofObject:change:context:] at /Users/tut/Projects/ButTunes/ButTunes/AppDelegate.m:505 #1 0x00007fffa196edbd in NSKeyValueNotifyObserver () #2 0x00007fffa196e654 in NSKeyValueDidChange () #3 0x00007fffa1aad2d7 in -[NSObject(NSKeyValueObservingPrivate) _changeValueForKeys:count:maybeOldValuesDict:usingBlock:] () #4 0x00007fffa1aacc2a in -[NSObject(NSKeyValueObservingPrivate) _notifyObserversOfChangeFromValuesForKeys:toValuesForKeys:] () #5 0x00007fffa001166a in forEachObserver () #6 0x00007fffa0011888 in -[CFPrefsSource _notifyObserversOfChangeFromValuesForKeys:toValuesForKeys:] () #7 0x00007fffa005fde2 in __84-[CFPrefsSearchListSource asynchronouslyNotifyOfChangesFromDictionary:toDictionary:]_block_invoke_2 () #8 0x00007fff9ff5130c in __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ () #9 0x00007fff9ff32634 in __CFRunLoopDoBlocks () #10 0x00007fff9ff31da5 in __CFRunLoopRun () #11 0x00007fff9ff317b4 in CFRunLoopRunSpecific () #12 0x00007fff9f4cdfbc in RunCurrentEventLoopInMode () #13 0x00007fff9f4cdcf9 in ReceiveNextEventCommon () #14 0x00007fff9f4cdc26 in _BlockUntilNextEventMatchingListInModeWithFilter () #15 0x00007fff9dbb7b79 in _DPSNextEvent () #16 0x00007fff9e2cd1c3 in -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] () #17 0x00007fff9dbac53d in -[NSApplication run] () #18 0x00007fff9db771ad in NSApplicationMain () #19 0x0000000100001af2 in main at /Users/tut/Projects/ButTunes/ButTunes/main.m:12 I requested both the old and new values in the change parameter. Both values are the same in each call stack. I'm running 10.12.1 in Xcode 8.1. This sure looks like a bug. Any way to fix it other than checking that the new value is really different than what's really in NSUserDefaults? -- Steve Mills Drummer, Mac geek _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
