1.在Supporting Files文件夹右键，NewFile… -> iOS -> Resources -> String Files，命名为Localizable.strings

2.选中Localizable.strings 点击 XCode-> View-> Utilities -> File Inspector,在Localization中点+添加语言比如中文英文

3.现在修改Localizable.strings(English)
“test” = “test”;
和Localizable.strings(Chinese)就可以了
“test” = “测试”;

 //获取当前的系统语言设置

   NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; 

   NSArray *languages = [defaults objectForKey:@"AppleLanguages"]; 

   NSString *currentLanguage = [languages objectAtIndex:0];

   NSLog(@"%@",currentLanguage);

            

   //设置用户语言为当前系统语言

   [defaults setObject:currentLanguage forKey:@"user_lang_string"];

 

   

 可以使用NSLocalizedString来调用。

  UINavigationItem *navItem = [[UINavigationItem alloc]initWithTitle:NSLocalizedString(@"SignIn", @"Sign in now")];