如前所述，只要做:

[[NSUserDefaults standardUserDefaults] setObject: [NSArray arrayWithObjects:@"el", nil] forKey:@"AppleLanguages"];

但是为了避免不得不重新启动应用程序，请将该行放在main的main方法中。m，就在UIApplicationMain(…)之前。

你觉得Swift 3的这个解决方案怎么样?

extension String {

    func localized(forLanguage language: String = Locale.preferredLanguages.first!.components(separatedBy: "-").first!) -> String {

        guard let path = Bundle.main.path(forResource: language == "en" ? "Base" : language, ofType: "lproj") else {

            let basePath = Bundle.main.path(forResource: "Base", ofType: "lproj")!

            return Bundle(path: basePath)!.localizedString(forKey: self, value: "", table: nil)
        }

        return Bundle(path: path)!.localizedString(forKey: self, value: "", table: nil)
    }
}

简单的用法:

"report".localized(forLanguage: "pl") //forced language
"report".localized() //default language selected by user in settings, in case when your app doesnt support selected lanaguage, the default one is selected, here is an english.

我想添加对iOS官方不支持的语言的支持(未在系统设置下的语言部分列出)。通过遵循苹果的国际化教程和Brian Webster和geon的一些提示，我想出了这段代码(把它放在main.m中):

int main(int argc, char * argv[]) {
    @autoreleasepool {
        // Grab regional settings locale, for Slovenian this is either sl_SI or en_SI
        NSLocale *locale = [NSLocale currentLocale];
        NSString *ll = [locale localeIdentifier]; // sl_SI

        // Grab the first part of language identifier
        NSArray *comp = [ll componentsSeparatedByString:@"_"];
        NSString *ll1 = @"en";
        if (comp.count > 0) {
            ll1 = comp[0]; // sl, en, ...
        }
        // Check if we already saved language (user can manually change it inside app for example)
        if (![[NSUserDefaults standardUserDefaults] objectForKey:@"SelectedLanguage"]) {
            //   Slovenian (Slovenia),            Slovenia
            if ([ll isEqualToString:@"sl_SI"] || [ll isEqualToString:@"en_SI"]) {
                ll1 = @"sl-SI"; // This is the part of localized path for Slovenian language that Xcode generates
            }
            // Add more unsupported languages here...

            [[NSUserDefaults standardUserDefaults] setObject:ll1 forKey:@"SelectedLanguage"]; // Save language
        }
        else {
            // Restore language as we have previously saved it
            ll1 = [[NSUserDefaults standardUserDefaults] objectForKey:@"SelectedLanguage"];
        }
        // Overwrite NSLocalizedString and StoryBoard language preference
        [[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObjects:ll1, @"en", @"fr", nil] forKey:@"AppleLanguages"];
        // Make sure settings are stored to disk
        [[NSUserDefaults standardUserDefaults] synchronize];

        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
}

这适用于Storyboard和NSLocalizedString代码。该代码假设用户将有一个选项，手动更改应用程序内的语言稍后。

当然，不要忘记添加适当的故事板翻译和本地化。字符串翻译(见链接到上面的苹果页面如何做到这一点)。

我通常这样做，但你必须有所有的本地化文件在你的项目。

@implementation Language

static NSBundle *bundle = nil;

+(void)initialize 
{
    NSUserDefaults* defs = [NSUserDefaults standardUserDefaults];
    NSArray* languages = [defs objectForKey:@"AppleLanguages"];
    NSString *current = [[languages objectAtIndex:0] retain];
    [self setLanguage:current];
}

/*
  example calls:
    [Language setLanguage:@"it"];
    [Language setLanguage:@"de"];
*/
+(void)setLanguage:(NSString *)l
{
    NSLog(@"preferredLang: %@", l);
    NSString *path = [[ NSBundle mainBundle ] pathForResource:l ofType:@"lproj" ];
    bundle = [[NSBundle bundleWithPath:path] retain];
}

+(NSString *)get:(NSString *)key alter:(NSString *)alternate 
{
    return [bundle localizedStringForKey:key value:alternate table:nil];
}

@end

Swift 3解决方案:

let languages = ["bs", "zh-Hant", "en", "fi", "ko", "lv", "ms", "pl", "pt-BR", "ru", "sr-Latn", "sk", "es", "tr"]
UserDefaults.standard.set([languages[0]], forKey: "AppleLanguages")

给出了一些可以使用的语言代码的例子。希望这能有所帮助

请勿在iOS 9上使用。对于所有经过它的字符串返回nil。

我找到了另一个解决方案，允许您更新语言字符串，w/o重新启动应用程序和兼容genstrings:

将这个宏放在Prefix.pch中:

#define currentLanguageBundle [NSBundle bundleWithPath:[[NSBundle mainBundle] pathForResource:[[NSLocale preferredLanguages] objectAtIndex:0] ofType:@"lproj"]]

在任何需要本地化字符串的地方使用:

NSLocalizedStringFromTableInBundle(@"GalleryTitleKey", nil, currentLanguageBundle, @"")

设置语言使用。

[[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObject:@"de"] forKey:@"AppleLanguages"];

即使连续的语言跳跃也能工作，比如:

NSLog(@"test %@", NSLocalizedStringFromTableInBundle(@"NewKey", nil, currentLanguageBundle, @""));
[[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObject:@"fr"] forKey:@"AppleLanguages"];
NSLog(@"test %@", NSLocalizedStringFromTableInBundle(@"NewKey", nil, currentLanguageBundle, @""));
[[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObject:@"it"] forKey:@"AppleLanguages"];
NSLog(@"test %@", NSLocalizedStringFromTableInBundle(@"NewKey", nil, currentLanguageBundle, @""));
[[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObject:@"de"] forKey:@"AppleLanguages"];
NSLog(@"test %@", NSLocalizedStringFromTableInBundle(@"NewKey", nil, currentLanguageBundle, @""));