检测系统语言更改OS X

Question

Is there any way to detect the system language change event under OS X?

I've tried to search on the developer.apple.com, but with no results.

I'm looking for a solution on C++/Obj-C.

Answer 1

If you're working in Objective-C/Swift, you can use NSDistributedNotificationCenter to watch for language change notifications:

// You are not required to register self -- this can be any object, and the selector name can be anything taking one argument.
[[NSDistributedNotificationCenter defaultCenter] addObserver:self selector:@selector(languageChanged:) name:@"AppleLanguagePreferencesChangedNotification" object:nil];

You can name languageChanged: whatever you'd like, as long as the method takes an NSNotification object:

- (void)languageChanged:(NSNotification *)notification {
    // New preferred language.
    NSString *language = [[NSLocale preferredLanguages] firstObject];
}

Take a look at the NSDistributedNotificationCenter docs for more info.