iOS多语言国际化

1、增加多语言环境

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2、创建多语言文件

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3、使用多语言文件添加多语言变量
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4、使用多语言

   NSBundle *bundle = [NSBundle mainBundle];
    NSString *string = NSLocalizedStringFromTableInBundle(key, @"Localizable",bundle, nil);

对于有些app存在app内语言切换功能，我们可以通过自定义获取多语言配置来进行实现。
我们创建一个单独的多语言文件管理类来进行统一管理。

//获取本地语言
#define LocalizedString(key) [[LanguageManager sharedInstance] localizedStringForKey:key]

@interface LanguageManager : NSObject

+ (instancetype)sharedInstance;

- (void)setApplicationLanguageTo:(NSString *)languageCode;
- (NSString *)localizedStringForKey:(NSString *)key;

@end

实现对应的方法

static NSString *const kUserSelectedLanguageKey = @"UserSelectedLanguage";
static LanguageManager *_sharedInstance = nil;

@implementation LanguageManager

+ (instancetype)sharedInstance {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        _sharedInstance = [[self alloc] init];
    });
    return _sharedInstance;
}

- (NSString *)currentLanguage {
    NSString *userSelectedLanguage = [[NSUserDefaults standardUserDefaults] stringForKey:kUserSelectedLanguageKey];
    
    if (userSelectedLanguage) {
        return userSelectedLanguage;
    } else {
        NSArray<NSString *> *preferredLanguages = [[NSLocale preferredLanguages] copy];
        return [preferredLanguages firstObject];
    }
}

- (void)setApplicationLanguageTo:(NSString *)languageCode {
    [[NSUserDefaults standardUserDefaults] setObject:languageCode forKey:kUserSelectedLanguageKey];
    [[NSUserDefaults standardUserDefaults] synchronize];

    // 发送通知让所有观察者知道语言已更改
    [[NSNotificationCenter defaultCenter] postNotificationName:@"LanguageDidChangeNotification" object:nil];
}

- (NSBundle *)localizedBundle {
    NSString *language = [self currentLanguage];
    NSString *path = [[NSBundle mainBundle] pathForResource:language ofType:@"lproj"];
    if (path) {
        return [NSBundle bundleWithPath:path];
    } else {
        return [NSBundle mainBundle];
    }
}

- (NSString *)localizedStringForKey:(NSString *)key {
     NSBundle *bundle = [self localizedBundle];
    NSString *string = NSLocalizedStringFromTableInBundle(key, @"Localizable",bundle, nil);
    return string;
}

@end