How to force NSLocalizedString to use a specific language iOS APP内国际化
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http://stackoverflow.com/questions/1669645/how-to-force-nslocalizedstring-to-use-a-specific-language?lq=1
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up vote 177 down vote accepted |
NSLocalizedString() (and variants thereof) access the "AppleLanguages" key in NSUserDefaultsto determine what the user's settings for preferred languages are. This returns an array of language codes, with the first one being the one set by the user for their phone, and the subsequent ones used as fallbacks if a resource is not available in the preferred language. (on the desktop, the user can specify multiple languages with a custom ordering in System Preferences)
You can override the global setting for your own application if you wish by using the setObject:forKey: method to set your own language list. This will take precedence over the globally set value and be returned to any code in your application that is performing localization. The code for this would look something like: [[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObjects:@"de", @"en", @"fr", nil] forKey:@"AppleLanguages"];
[[NSUserDefaults standardUserDefaults] synchronize]; //to make the change immediate
This would make German the preferred language for your application, with English and French as fallbacks. You would want to call this sometime early in your application's startup. You can read more about language/locale preferences here: Internationalization Programming Topics: Getting the Current Language and Locale
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up vote 111 down vote |
I usually do this in this way, but you MUST have all localization files in your project. @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
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up vote 82 down vote |
NSLocalizedStringnor force the app to restart for the new language to work. I wanted everything to work as-is. My solution was to dynamically change the main bundle's class and load the appropriate bundle there: Header file @interface NSBundle (Language)
+(void)setLanguage:(NSString*)language;
@end
Implementation #import <objc/runtime.h>
static const char _bundle=0;
@interface BundleEx : NSBundle
@end
@implementation BundleEx
-(NSString*)localizedStringForKey:(NSString *)key value:(NSString *)value table:(NSString *)tableName
{
NSBundle* bundle=objc_getAssociatedObject(self, &_bundle);
return bundle ? [bundle localizedStringForKey:key value:value table:tableName] : [super localizedStringForKey:key value:value table:tableName];
}
@end
@implementation NSBundle (Language)
+(void)setLanguage:(NSString*)language
{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^
{
object_setClass([NSBundle mainBundle],[BundleEx class]);
});
objc_setAssociatedObject([NSBundle mainBundle], &_bundle, language ? [NSBundle bundleWithPath:[[NSBundle mainBundle] pathForResource:language ofType:@"lproj"]] : nil, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}
@end
So basically, when your app starts and before you load your first controller, simply call: [NSBundle setLanguage:@"en"];
When your user changes his preferred language in your setting screen, simply call it again: [NSBundle setLanguage:@"fr"];
To reset back to system defaults, simply pass nil: [NSBundle setLanguage:nil];
Enjoy...
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up vote 36 down vote |
Do not use on iOS 9. This returns nil for all strings passed through it. I have found another solution that allows you to update the language strings, w/o restarting the app and compatible with genstrings: Put this macro in the Prefix.pch: #define currentLanguageBundle [NSBundle bundleWithPath:[[NSBundle mainBundle] pathForResource:[[NSLocale preferredLanguages] objectAtIndex:0] ofType:@"lproj"]]
and where ever you need a localized string use: NSLocalizedStringFromTableInBundle(@"GalleryTitleKey", nil, currentLanguageBundle, @"")
To set the language use: [[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObject:@"de"] forKey:@"AppleLanguages"];
Works even with consecutive language hopping like: 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, @""));
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show 5 |
up vote 30 down vote |
As said earlier, just do: [[NSUserDefaults standardUserDefaults] setObject: [NSArray arrayWithObjects:@"el", nil] forKey:@"AppleLanguages"];
main.m, just before UIApplicationMain(...).
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up vote 11 down vote |
I like best Mauro Delrio's method. I also have added the following in my Project_Prefix.pch #import "Language.h"
#define MyLocalizedString(key, alt) [Language get:key alter:alt]
So if you ever want to use the standard method (that uses NSLocalizedString) you can make a quick syntax substitution in all files.
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up vote 9 down vote |
applicationDidFinishLaunching: of the AppDelegate
after It seems to work fine if I put the code in the main function, though: int main(int argc, char *argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
// Force language to Swedish.
[[NSUserDefaults standardUserDefaults]
setObject:[NSArray arrayWithObject:@"sv"]
forKey:@"AppleLanguages"];
int retVal = UIApplicationMain(argc, argv, nil, nil);
[pool release];
return retVal;
}
I'd appreciate any comments on this.
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up vote 7 down vote |
NSLocalizedString. I create a category of NSBundle call NSBundle+RunTimeLanguage. The interface is like this.
// NSBundle+RunTimeLanguage.h
#import <Foundation/Foundation.h>
@interface NSBundle (RunTimeLanguage)
#define NSLocalizedString(key, comment) [[NSBundle mainBundle] runTimeLocalizedStringForKey:(key) value:@"" table:nil]
- (NSString *)runTimeLocalizedStringForKey:(NSString *)key value:(NSString *)value table:(NSString *)tableName;
@end
The implementation is like this. // NSBundle+RunTimeLanguage.m
#import "NSBundle+RunTimeLanguage.h"
#import "AppDelegate.h"
@implementation NSBundle (RunTimeLanguage)
- (NSString *)runTimeLocalizedStringForKey:(NSString *)key value:(NSString *)value table:(NSString *)tableName
{
AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
NSString *path= [[NSBundle mainBundle] pathForResource:[appDelegate languageCode] ofType:@"lproj"];
NSBundle *languageBundle = [NSBundle bundleWithPath:path];
NSString *localizedString=[languageBundle localizedStringForKey:key value:key table:nil];
return localizedString;
}
@end
NSBundle+RunTimeLanguage.h into the files that use NSLocalizedString.AppDelegate. This could be stored anywhere you'd like.NSLocalizedString
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up vote 5 down vote |
NSLocalizedString() reads the value for the key AppleLanguages from the standard user defaults ([NSUserDefaults standardUserDefaults]). It uses that value to choose an appropriate localization among all existing localizations at runtime. When Apple builds the user defaults dictionary at app launch, they look up the preferred language(s) key in the system preferences and copy the value from there. This also explains for example why changing the language settings in OS X has no effect on running apps, only on apps started thereafter. Once copied, the value is not updated just because the settings change. That's why iOS restarts all apps if you change then language.all values of the user defaults dictionary can be overwritten by command line arguments. See NSUserDefaults documentation on the NSArgumentDomain. This even includes those values that are loaded from the app preferences (.plist) file. This is really good to know if you want to change a value just once for testing.
So if you want to change the language just for testing, you probably don't want to alter your code (if you forget to remove this code later on ...), instead tell Xcode to start your app with a command line parameters (e.g. use Spanish localization):
No need to touch your code at all. Just create different schemes for different languages and you can quickly start the app once in one language and once in another one by just switching the scheme.
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up vote 4 down vote |
.pch #define currentLanguageBundle [NSBundle bundleWithPath:[[NSBundle mainBundle] pathForResource:[[NSLocale preferredLanguages] objectAtIndex:0] ofType:@"lproj"]]
#define NSLocalizedString(str,nil) NSLocalizedStringFromTableInBundle(str, nil, currentLanguageBundle, @"")
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up vote 4 down vote |
In a nutshell : Localize your application It's the first thing you have to do is to localise your app with at least two languages (english and french in this example). Override NSLocalizedStringNSLocalizedString(key, comment), use a macro MYLocalizedString(key, comment) defined like this : #define MYLocalizedString(key, comment) [[MYLocalizationSystem sharedInstance] localizedStringForKey:(key) value:(comment)];MYLocalizationSystem
- Set langage by setting the right localized NSBundle
- Returns the localized NSString
Set user language[[MYLocalizationSystem sharedInstance] setLanguage:@"fr"];
- (void)setLanguage:(NSString *)lang
{
NSString *path = [[NSBundle mainBundle] pathForResource:lang ofType:@"lproj"];
if (!path)
{
_bundle = [NSBundle mainBundle];
NSLog(@"Warning: No lproj for %@, system default set instead !", lang);
return;
}
_bundle = [NSBundle bundleWithPath:path];
}
this method set localized bundle to fr.lproj Return localized string Once you've set the localized bundle, you'll be able to get the right localised string from him with this method : - (NSString *)localizedStringForKey:(NSString *)key value:(NSString *)value
{
// bundle was initialized with [NSBundle mainBundle] as default and modified in setLanguage method
return [self.bundle localizedStringForKey:key value:value table:nil];
}
Hope this will help you. You'll find more details in this article from NSWinery.io
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up vote 3 down vote |
You could build a sub-bundle with the set of localized strings that you want to do this with, and then use NSLocalizedStringFromTableInBundle() to load them. (I'm assuming that this is content separate from the normal UI localization you might be doing on the app.)
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up vote 3 down vote |
Maybe you should complement with this (on .pch file after #import ): extern NSBundle* bundle; // Declared on Language.m
#ifdef NSLocalizedString
#undef NSLocalizedString
// Delete this line to avoid warning
#warning "Undefining NSLocalizedString"
#endif
#define NSLocalizedString(key, comment) \
[bundle localizedStringForKey:(key) value:@"" table:nil]
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up vote 2 down vote |
for my case i have two localized file , ja and en and i would like to force it to en if the preferred language in the system neither en or ja i'm going to edit the main.m file i 'll check whether the first preferred is en or ja , if not then i 'll change the second preferred language to en. int main(int argc, char *argv[])
{
[[NSUserDefaults standardUserDefaults] removeObjectForKey:@"AppleLanguages"];
[[NSUserDefaults standardUserDefaults] synchronize];
NSString *lang = [[NSLocale preferredLanguages] objectAtIndex:0];
if (![lang isEqualToString:@"en"] && ![lang isEqualToString:@"ja"]){
NSMutableArray *array = [[NSMutableArray alloc] initWithArray:[NSLocale preferredLanguages]];
[array replaceObjectAtIndex:1 withObject:@"en"];
[[NSUserDefaults standardUserDefaults] setObject:array forKey:@"AppleLanguages"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
@autoreleasepool {
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}
}
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add a comment |
up vote 2 down vote |
swift version NSUserDefaults.standardUserDefaults().setObject(["fr"], forKey: "AppleLanguages") NSUserDefaults.standardUserDefaults().synchronize()
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up vote 1 down vote |
This function will try to get localized string for current language and if it's not found it will get it using english language. - (NSString*)L:(NSString*)key
{
static NSString* valueNotFound = @"VALUE_NOT_FOUND";
static NSBundle* enBundle = nil;
NSString* pl = [NSLocale preferredLanguages][0];
NSString* bp = [[NSBundle mainBundle] pathForResource:pl ofType:@"lproj"];
NSBundle* b = [NSBundle bundleWithPath:bp];
NSString* s = [b localizedStringForKey:key value:valueNotFound table:nil];
if ( [s isEqualToString:valueNotFound] ) {
if ( !enBundle ) {
bp = [[NSBundle mainBundle] pathForResource:@"en" ofType:@"lproj"];
enBundle = [NSBundle bundleWithPath:bp];
}
s = [enBundle localizedStringForKey:key value:key table:nil];
}
return s;
}
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up vote 1 down vote |
You can do something like this: NSString *bundlePath = [[NSBundle mainBundle] pathForResource:@"Localizable" ofType:@"strings" inDirectory:nil forLocalization:@"es"];
NSBundle *spanishBundle = [[NSBundle alloc] initWithPath:[bundlePath stringByDeletingLastPathComponent]];
NSLocalizedStringFromTableInBundle(@"House", nil, spanishBundle, nil):
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up vote 0 down vote |
whatever you all do, the best way is to take the short_name for the specified language, i.e.: fr, en, nl, de, it, etc... and assign the same to a global value. make a picker view to pop up like a drop down menu (combination of a button on click of which a picker view appears from below with a list of languages) and select the language you desire. let the short name be stored internally. make a .h + .m file named LocalisedString. Set the global value of short_name to be equal to the obtained value in LocalisedString.m When the required language is selected assign the NSBundlePath to create project sub-directories for the needed language. for eg, nl.proj, en.proj. When the particular proj folder is selected call the localised string for the respective language and change the language dynamically. no rules broken.
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up vote 0 down vote |
I wanted to add support for a language that isn't officially supported by iOS (not listed in Language section under system settings). By following the Apple's Internationalization Tutorial and few hints here by Brian Webster and geon, I came up with this piece of code (put it in main.m): 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]));
}
}
This works well for both Storyboard and NSLocalizedString code. The code assumes that user will have an option to manually change language inside app later on. Of course, don't forget to add proper Storyboard translations and Localizable.strings translations (see link to Apple page above for how to do that).
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up vote 0 down vote |
Here is a decent solution for this problem, and it does not require application restart. https://github.com/cmaftuleac/BundleLocalization This implementation works by tweaking inside NSBundle. The idea is that you override the method localizedStringForKey on the instance of NSBundle object, and then call this method on a different bundle with a different language. Simple and elegant fully compatible with all types of resources.
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up vote 0 down vote |
Based on Tudorizer's answer to change language without leaving or restarting Instead of a macro, use a class for accessing the preferred language in order to check if a specific language code is present. Below is a class used to obtain the current language bundle that is working for iOS 9: @implementation OSLocalization
+ (NSBundle *)currentLanguageBundle
{
// Default language incase an unsupported language is found
NSString *language = @"en";
if ([NSLocale preferredLanguages].count) {
// Check first object to be of type "en","es" etc
// Codes seen by my eyes: "en-US","en","es-US","es" etc
NSString *letterCode = [[NSLocale preferredLanguages] objectAtIndex:0];
if ([letterCode rangeOfString:@"en"].location != NSNotFound) {
// English
language = @"en";
} else if ([letterCode rangeOfString:@"es"].location != NSNotFound) {
// Spanish
language = @"es";
} else if ([letterCode rangeOfString:@"fr"].location != NSNotFound) {
// French
language = @"fr";
} // Add more if needed
}
return [NSBundle bundleWithPath:[[NSBundle mainBundle] pathForResource:language ofType:@"lproj"]];
}
/// Check if preferred language is English
+ (BOOL)isCurrentLanguageEnglish
{
if (![NSLocale preferredLanguages].count) {
// Just incase check for no items in array
return YES;
}
if ([[[NSLocale preferredLanguages] objectAtIndex:0] rangeOfString:@"en"].location == NSNotFound) {
// No letter code for english found
return NO;
} else {
// Tis English
return YES;
}
}
/* Swap language between English & Spanish
* Could send a string argument to directly pass the new language
*/
+ (void)changeCurrentLanguage
{
if ([self isCurrentLanguageEnglish]) {
[[NSUserDefaults standardUserDefaults] setObject:@[@"es"] forKey:@"AppleLanguages"];
} else {
[[NSUserDefaults standardUserDefaults] setObject:@[@"en"] forKey:@"AppleLanguages"];
}
}
@end
Use the class above to reference a string file / image / video / etc: // Access a localized image
[[OSLocalization currentLanguageBundle] pathForResource:@"my_image_name.png" ofType:nil]
// Access a localized string from Localizable.strings file
NSLocalizedStringFromTableInBundle(@"StringKey", nil, [OSLocalization currentLanguageBundle], @"comment")
Change language in-line like below or update the "changeCurrentLanguage" method in the class above to take a string parameter referencing the new language. [[NSUserDefaults standardUserDefaults] setObject:@[@"es"] forKey:@"AppleLanguages"];
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