Cocoa等效于.NET的Environment.SpecialFolder,用于保存首选项/设置?

在Mac OSX中,应用程序首选项通过NSUserDefaults自动存储,并保存到.plist文件中 ~/Library/Preferences/ . 您不需要对该文件执行任何操作,NSUserDefaults将为您处理一切。

如果在非基于文档的应用程序(如AddressBook.app)中有数据文件,则应将其存储在 ~/Library/Application Support/Your App Name/

+ (NSString *)applicationSupportFolder;
{
    // Find this application's Application Support Folder, creating it if 
    // needed.

    NSString *appName, *supportPath = nil;
    NSArray *paths = NSSearchPathForDirectoriesInDomains( NSApplicationSupportDirectory, NSUserDomainMask, YES );

    if ( [paths count] > 0)
    {
        appName = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleExecutable"];
        supportPath = [[paths objectAtIndex:0] stringByAppendingPathComponent:appName];

        if ( ![[NSFileManager defaultManager] fileExistsAtPath:supportPath] )
            if ( ![[NSFileManager defaultManager] createDirectoryAtPath:supportPath attributes:nil] )
                supportPath = nil;
    }

    return supportPath;
}

对于大多数内容,您应该只使用NSUserDefaults API,它为您处理磁盘上的持久化设置。