How do I know if a language NSLocale uses spaces for delimiting words in a sentence (like English or other roman languages) or not (like Japanese)?
I expected to find this information under NSLocale Component Keys … no. Any idea? Do I really need to set my own dictionary for this. I'd appreciate any advice or related resource.
You can use NSLocal Components keys' NSLocaleExemplarCharacterSet to get the set of character in that language and then see if space is part of that language character set
NSLocale *jpLocale = [[NSLocal alloc] initWithLocalDentifier: #"ja_JP"];
NSCharacterSet *jpCharSet = (NSCharacterSet *)[jpLocale objectForKey: NSLocaleExemplarCharacterSet];
[jpCharSet characterIsMember: ' '] ? NSLog("Yeah it uses space"); : NSLog("Nope");
I still haven't found a great solution. As a workaround I am checking for spaces in fullStyle strings from a random date using the NSDateFormatter
NSDate* exampleDate = [NSDate dateWithTimeIntervalSince1970:0];
NSDateFormatter *dateFormatter = [NSDateFormatter new];
dateFormatter.locale = [NSLocale currentLocale];
dateFormatter.dateStyle = NSDateFormatterFullStyle;
NSString *testString = [dateFormatter stringFromDate:exampleDate];
BOOL localeLikelyUsesSpaceAsDelimitters = [testString rangeOfString:#" "].location == NSNotFound;
Better ideas?
I'm trying to parse a NSString with a NSNumberFormatter like following.
NSNumberFormatter *myFormatter = [[[NSNumberFormatter alloc] init];
NSNumber *myNumber = [myFormatter numberFromString:#"42.00000"];
numberFromString returns a NSNumber object in the simulator but not on a device.
The decimals (.00000) are causing the return value to be nil on a device because parsing 42 (without the decimals) works just fine (both in the simulator and on a device).
The reason I'm using a NSNumberFormatter is because is like how it returns nil if the string is not a valid number (which is working against me here :p). NSString doubleValue does not provide this kind of behaviour. Also, NSDecimalNumber decimalNumberWithString doesn't do the job because [NSDecimalNumber decimalNumberWithString:#"4a2.00000"] returns 4.
Any ideas why this would not work on a device?
Is it the locale? I tried setting myFormatter.numberStyle = NSNumberFormatterNoStyle and NSNumberFormatterDecimalStyle but it changes nothing.
As #rmaddy already said in a comment, the decimal separator of NSNumberFormatter is
locale dependent. If you have a fixed input format with the dot as decimal separator,
you can set the "POSIX locale":
NSNumberFormatter *myFormatter = [[NSNumberFormatter alloc] init];
[myFormatter setLocale:[NSLocale localeWithLocaleIdentifier:#"en_US_POSIX"]];
NSNumber *myNumber = [myFormatter numberFromString:#"42.00000"];
Alternatively, you can use NSScanner to parse a double value, as e.g. described
here: parsing NSString to Double
42.00000 is not a string mate, why not #"42.00000"?
I have an NSDictionary which consist of multiple key/pair values. One of them consist double value.
NSNumber *goalValue = [info objectForKey:#"goalValue"];
I put breakpoint and I found that goalValue store the normal value that I need.
and just below I convert it to NSSting like
NSString *stringValue=[goalValue stringValue];
and this stringValue store very strange value.
Guys please help me. I am totally puzzled, I did goggle but nothing change. Please help me. Thanks in advance.
The method stringValue will convert the NSNumber to string by internally calling descriptionWithLocale: with locale as nil and this method in turn will call initWithFormat:locale:,
From Apple docs,
To obtain the string representation, this method invokes NSString’s initWithFormat:locale: method, supplying the format based on the type the NSNumber object was created with:
So format specifier used for double is %0.16g(i.e. 16 digit precision) hence the value 98.09999999999999
I'd suggest using NSNumberFormatter,
NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
[numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle];
[numberFormatter setMaximumFractionDigits:2]; //2 decimal places, change this as required.
NSString *string = [numberFormatter stringFromNumber:goalValue];
Hope that helps!
To prevent this behavior, I suggest using NSDecimalNumber (also this is from my experience best format when dealing with very precise amounts)
NSDecimalNumber *doubleDecimal = [[NSDecimalNumber alloc] initWithDouble:[info objectForKey:#"goalValue"]];
for two digits formatting, use numberFormatter
NSNumberFormatter * nf = [[NSNumberFormatter alloc] init];
[nf setMinimumFractionDigits:2];
[nf setMaximumFractionDigits:2];
NSString *stringValue = [nf stringFromNumber:doubleDecimal]
Its showing the rounded value so you can round the value to single digit using NSNumberFormatter.
NSNumberFormatter *fomatter = [[NSNumberFormatter alloc] init];
[fomatter setMaximumSignificantDigits:2];
NSString *stringValue=[fomatter stringFromNumber:goalValue];
Not sure if this is possible, but for my app I would like to get a locale based string that describes a number.
For example, if I had the number 10,000,000.
In english, I would expect the phrase "Ten Million". However, in Hindi, it would be One crore. Is there any properties in NSNumberFormatter, or NSLocale that could help me with this?
I have checked the docs (NSNumberFormatter, NSLocale), and havent found what I'm looking for yet. Obviously I could write some code to handle these two cases, but I'd like a way that could work for any locale.
Edit: Thanks to leo for the answer! Here is a small snippet of code that will get anyone looking for the same thing started:
NSNumberFormatter formatter = [[NSNumberFormatter alloc] init];
[self.formatter setNumberStyle:NSNumberFormatterSpellOutStyle];
NSLocale *locale = [[NSLocale alloc] initWithLocaleIdentifier:#"hi_hi"];
[self.formatter setLocale:locale];
NSNumber * myNumber = [NSNumber numberWithInt:10000];
self.numberLabel.text = [self.formatter stringFromNumber:myNumber];
What you are looking for is the NSNumberFormatterSpellOutStyle style.
NSString* spelledOutString = [NSNumberFormatter localizedStringFromNumber:#10000000 numberStyle:NSNumberFormatterSpellOutStyle];
I need to get a string like en_US or es_ES in iOS.
The obvious method is to use [NSLocale currentLocale] and get the language info from there. However, that gives you the "region format" and not the actual device language, which means that if you have the device language in english but the region format as "spain", it'll erroneously report es_ES.
If you need the device language you must do this instead:
[[NSLocale preferredLanguages] objectAtIndex:0]
However, that only gives you the language, so you get something like en or es, without the country code at the end.
How would I get the country code correctly, like Safari does?
Try with this code:
NSString *locale = [[NSLocale currentLocale] localeIdentifier];
NSRange startRange = [locale rangeOfString:#"_"];
NSString *result = [locale stringByReplacingCharactersInRange:NSMakeRange(0, startRange.length+1) withString:[[NSLocale preferredLanguages] objectAtIndex:0]];
DebugLog(#"current locale: %#", result);
Ok, seeing getting the right info out of iOS is probably not possible, here's a hackish solution but which gives the output I needed. It's not complete and it won't give precise output in some cases (like for arabic), but it's the best I've been able to get.
const string lang = [[[NSLocale preferredLanguages] objectAtIndex:0] UTF8String];
// Search the language with country code in the langs map
static std::map<string, string> langMap;
static bool initialized = false;
if(!initialized) {
#define LANG(l, c) langMap.insert(std::make_pair(#l, #c))
LANG(en, en-us); LANG(es, es-es); LANG(fr, fr-fr); LANG(de, de-de);
LANG(ja, ja-jp); LANG(nl, nl-nl); LANG(it, it-it); LANG(pt, pt-br);
LANG(da, da-dk); LANG(fi, fi-fi); LANG(nb, nb-no); LANG(sv, sv-se);
LANG(ko, ko-kr); LANG(ru, ru-ru); LANG(pl, pl-pl); LANG(tr, tr-tr);
LANG(uk, uk-ua); LANG(hr, hr-hr); LANG(cs, cs-cz); LANG(el, el-gr);
LANG(he, he-il); LANG(ro, ro-ro); LANG(sk, sk-sk); LANG(th, th-th);
LANG(ca, ca-es); LANG(hu, hu-hu); LANG(vi, vi-vn);
LANG(zh-Hans, zh-cn); LANG(pt-PT, pt-pt); LANG(id, id); LANG(ms, ms);
LANG(zh-Hant, zh-tw); LANG(en-GB, en-gb); LANG(ar, ar);
#undef LANG
initialized = true;
}
map<string,string>::iterator it = langMap.find(lang);
if( it != langMap.end() ){
return it->second;
}
// Didn't find a country code, default to the lang name
return lang;
Check the below code:
NSArray *langs = [NSLocale preferredLanguages];
for (NSString *lang in langs) {
NSLog(#"%#: %# %#",lang, [NSLocale canonicalLanguageIdentifierFromString:lang], [[[NSLocale alloc] initWithLocaleIdentifier:lang] displayNameForKey:NSLocaleIdentifier value:lang]);
}
Swift
NSLocale.preferredLanguages()[0] as String
Output would be like
en-GB
Source
An alternative would be to reconstruct the locale from the components of the current locale, swapping in the language that you want.
For example, to get the current locale but modified to use the language which UIKit is currently using to display the app:
let languageCode = Bundle.main.preferredLocalizations.first ?? "en"
var components = Locale.components(fromIdentifier: Locale.current.identifier)
components[NSLocale.Key.languageCode.rawValue] = languageCode
let locale = Locale(identifier: Locale.identifier(fromComponents: components))
I am using this at the moment. I have run a few test cases and it seems ok, However I am not convinced that it is a robust solution. I am surprised not to find a clear answer to this simple problem. I would not recommend my solution but I hope it can generate discussion.
NSLocale *locale = [NSLocale currentLocale];
NSString *countryCode = [locale objectForKey: NSLocaleCountryCode];
NSString *language = [[NSLocale preferredLanguages] firstObject];
NSString *myLocale = [NSString stringWithFormat:#"%#_%#",language,countryCode];
NSLocale *userLocale = [[NSLocale alloc] initWithLocaleIdentifier:myLocale];
NSDate* now = [NSDate date];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
NSString *dateFormat = [NSDateFormatter dateFormatFromTemplate:#"E MMM d yyyy HH:mm" options:0 locale:userLocale];
Simply do this:
NSString *language = [[NSLocale preferredLanguages] objectAtIndex:0];
NSString *locale = [[NSLocale currentLocale] objectForKey: NSLocaleCountryCode];
NSString *formattedStr = [NSString stringWithFormat:#"%#_%#",language, locale];
NSLog(#"%#", formattedStr); // Display en_US for example