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iOS 上获取当前系统语言

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测试代码

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NSString *identifier = [[NSLocale currentLocale] localeIdentifier];
NSString *displayName = [[NSLocale currentLocale] displayNameForKey:NSLocaleIdentifier value:identifier];

NSString *udfLanguageCode = [[NSUserDefaults standardUserDefaults] objectForKey:@"AppleLanguages"][0];
NSString *pfLanguageCode = [NSLocale preferredLanguages][0];
NSString *localeLanguageCode = [[NSLocale currentLocale] objectForKey:NSLocaleLanguageCode];
NSString *language =  [[NSBundle mainBundle] preferredLocalizations][0];

NSLog(@"%@", identifier);
NSLog(@"%@", displayName);

NSLog(@"%@", [[NSUserDefaults standardUserDefaults] objectForKey:@"AppleLanguages"]);
NSLog(@"%@", udfLanguageCode);

NSLog(@"%@",[NSLocale preferredLanguages]);
NSLog(@"%@", pfLanguageCode);
NSLog(@"%@", localeLanguageCode);
NSLog(@"%@", language);

系统设置 & 打印信息 (模拟器和真机情况一致)

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2019-01-25 15:20:35.580212+0800 TestLanguage[22878:188985] en_JP
2019-01-25 15:20:35.580373+0800 TestLanguage[22878:188985] 英文（日本）
2019-01-25 15:20:35.580545+0800 TestLanguage[22878:188985] (
    "zh-Hant-HK",
    "zh-Hant-TW",
    "zh-Hans-JP",
    "ja-JP",
    "en-JP"
)
2019-01-25 15:20:35.580653+0800 TestLanguage[22878:188985] zh-Hant-HK
2019-01-25 15:20:35.580870+0800 TestLanguage[22878:188985] (
    "zh-Hant-HK",
    "zh-Hant-TW",
    "zh-Hans-JP",
    "ja-JP",
    "en-JP"
)
2019-01-25 15:20:35.580977+0800 TestLanguage[22878:188985] zh-Hant-HK
2019-01-25 15:20:35.581092+0800 TestLanguage[22878:188985] en
2019-01-25 15:20:35.581192+0800 TestLanguage[22878:188985] en
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2019-01-25 15:44:23.640336+0800 TestLanguage[30886:254351] en_CN
2019-01-25 15:44:23.640494+0800 TestLanguage[30886:254351] 英文（中國）
2019-01-25 15:44:23.640613+0800 TestLanguage[30886:254351] (
    "zh-Hant-HK",
    "zh-Hant-TW",
    "zh-Hans-CN",
    "ja-CN",
    "en-CN"
)
2019-01-25 15:44:23.640701+0800 TestLanguage[30886:254351] zh-Hant-HK
2019-01-25 15:44:23.640848+0800 TestLanguage[30886:254351] (
    "zh-Hant-HK",
    "zh-Hant-TW",
    "zh-Hans-CN",
    "ja-CN",
    "en-CN"
)
2019-01-25 15:44:23.640921+0800 TestLanguage[30886:254351] zh-Hant-HK
2019-01-25 15:44:23.640999+0800 TestLanguage[30886:254351] en
2019-01-25 15:44:23.641082+0800 TestLanguage[30886:254351] en