Objective c 如何从货币代码中获取NSLocale?
我正在尝试:Objective c 如何从货币代码中获取NSLocale?,objective-c,currency,nslocale,Objective C,Currency,Nslocale,我正在尝试: NSDictionary *components = [NSDictionary dictionaryWithObject:@"USD" forKey:NSLocaleCurrencyCode]; NSString *localeIdentifier = [NSLocale localeIdentifierFromComponents:components]; NSLocale *localeForDefaultCurrency = [[NSLocale alloc] initWi
NSDictionary *components = [NSDictionary dictionaryWithObject:@"USD" forKey:NSLocaleCurrencyCode];
NSString *localeIdentifier = [NSLocale localeIdentifierFromComponents:components];
NSLocale *localeForDefaultCurrency = [[NSLocale alloc] initWithLocaleIdentifier:localeIdentifier];
它创建NSLocale对象,但不包含任何区域信息。比如说,
[localeForDefaultCurrency objectForKey:NSLocaleCountryCode];
返回零
知道如何从货币代码中获取NSLocale吗?有一些技巧,比如用id创建区域设置,但不是像“en_US”这样的普通区域设置id,而是通过货币代码“USD”、“EUR”等传递给它,它似乎在某种程度上对欧元和美元有效,我可以检查它,但这是错误的方法 我知道的唯一正确的方法是获取所有区域设置,然后在循环中检查它们的货币代码,以与您拥有的货币代码进行比较。这样,当您找到代码时,您将停止循环
- (NSLocale *) findLocaleByCurrencyCode:(NSString *)_currencyCode
{
NSArray *locales = [NSLocale availableLocaleIdentifiers];
NSLocale *locale = nil;
NSString *localeId;
for (localeId in locales) {
locale = [[[NSLocale alloc] initWithLocaleIdentifier:localeId] autorelease];
NSString *code = [locale objectForKey:NSLocaleCurrencyCode];
if ([code isEqualToString:_currencyCode])
break;
else
locale = nil;
}
/* For some codes that locale cannot be found, init it different way. */
if (locale == nil) {
NSDictionary *components = [NSDictionary dictionaryWithObject:_currencyCode
forKey:NSLocaleCurrencyCode];
localeId = [NSLocale localeIdentifierFromComponents:components];
locale = [[NSLocale alloc] initWithLocaleIdentifier:localeId];
}
return locale;
}
正如某位客人在pastebin中发布的:
NSDictionary *components = [NSDictionary dictionaryWithObject:@"USD" forKey:NSLocaleCurrencyCode];
NSString *localeIdentifier = [NSLocale localeIdentifierFromComponents:components];
NSLocale *localeForDefaultCurrency = [[NSLocale alloc] initWithLocaleIdentifier:localeIdentifier];
[localeForDefaultCurrency objectForKey:NSLocaleCountryCode];
您可以在Swift中使用扩展功能:
extension NSLocale {
static func currencySymbolFromCode(code: String) -> String? {
let localeIdentifier = NSLocale.localeIdentifierFromComponents([NSLocaleCurrencyCode : code])
let locale = NSLocale(localeIdentifier: localeIdentifier)
return locale.objectForKey(NSLocaleCurrencySymbol) as? String
}
}
这样,代码中的任何地方都可以:
let code = "EUR"
let price = 10
if let currencySymbol = NSLocale.currencySymbolFromCode(code) as? String {
print("You have to pay \(price)\(currencySymbol)")
}
我发现了一个暗示。货币代码由三个字母组成,通常第一个字母和第二个字母是国家代码。例如“USD”->“US”。使用国家代码出于某种原因,上面的代码是有效的。我不能100%确定它在任何情况下是否有效。我不能确定这一原则适用于所有货币;)如果一种货币在多个国家使用,情况会怎样?在我的例子中,我有货币和国家代码。很有魅力,谢谢。
let code = "EUR"
let price = 10
if let currencySymbol = NSLocale.currencySymbolFromCode(code) as? String {
print("You have to pay \(price)\(currencySymbol)")
}