iOS Localize app manually then switch - ios

Question

I have been facing a problem with iOS Programming since its the first time I'm using Localization,,
I used the following to know which lang I'm having:
- (NSString*) getLanguage{
NSArray* languages = [[NSUserDefaults standardUserDefaults] objectForKey:#"AppleLanguages"];
NSString *preferredLang = [languages objectAtIndex:0];
return preferredLang;}
and there is button to change the lang That calls function to change the lang
- (void) setLanguage:(NSString*) l{
[[NSUserDefaults standardUserDefaults] setObject: [NSArray arrayWithObjects:l, nil] forKey:#"AppleLanguages"];
[[NSUserDefaults standardUserDefaults]synchronize];}
The language changes successfully, but I need to close and reopen the app to see the result, is there any other way to change the localisation automatically after switching lang?
NOTE: it should woke with storyboards too.

Answer 1

As #Tudorizer describes in this link after you translate your files
use this solution:
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"];
Multiple times:
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, #""));

Answer 2

You can switch between languages in your application using the following class:
(Note that anyway you should refresh content of all controllers stored in memory to get full effect.)
// AMLocalization.h
#define SetAppLanguage(language) [[AMLocalization sharedLocalization] setLanguage:language]
#define GetAppLanguage() [[AMLocalization sharedLocalization] language]
#define LSC(key, comment) [[AMLocalization sharedLocalization] localizedStringForKey:(key) value:(comment)]
#define UDKeyAppLanguage #"UDKeyAppLanguage"
typedef enum {
UILanguageUnknown,
UILanguageEnglish,
UILanguageFrench,
..................
} UILanguage;
#interface AMLocalization : NSObject
+ (AMLocalization *)sharedLocalization;
- (NSString *)localizedStringForKey:(NSString *)key value:(NSString *)comment;
- (BOOL) setLanguage:(UILanguage) lang;
- (UILanguage) language;
#end
// AMLocalization.m
#import "AMLocalization.h"
static AMLocalization *_s_sharedLocalization = nil;
#implementation AMLocalization {
NSBundle *_bundle;
NSDictionary *_languageSet;
}
+ (AMLocalization *)sharedLocalization
{
static dispatch_once_t once;
dispatch_once(&once, ^{
_s_sharedLocalization = [AMLocalization new];
});
return _s_sharedLocalization;
}
- (id) init
{
if (self = [super init]) {
_bundle = [NSBundle mainBundle];
_languageSet = #{
#(UILanguageEnglish) : #"en",
#(UILanguageFrench) : #"fr"
};
}
return self;
}
- (NSString *)localizedStringForKey:(NSString *)key value:(NSString *)comment
{
return [_bundle localizedStringForKey:key value:comment table:nil];
}
- (BOOL) setLanguage:(UILanguage) lang
{
UILanguage activeLang = [self language];
if (lang == UILanguageUnknown) {
_bundle = [NSBundle mainBundle];
[[NSUserDefaults standardUserDefaults] removeObjectForKey:UDKeyAppLanguage];
}
else {
NSString *path = [[NSBundle mainBundle] pathForResource:_languageSet[#(lang)] ofType:#"lproj"];
_bundle = [NSBundle bundleWithPath:path];
[[NSUserDefaults standardUserDefaults] setInteger:lang forKey:UDKeyAppLanguage];
}
[[NSUserDefaults standardUserDefaults] synchronize];
return activeLang != lang;
}
- (UILanguage) language
{
UILanguage lang = [[NSUserDefaults standardUserDefaults] integerForKey:UDKeyAppLanguage];
if (lang == UILanguageUnknown) {
NSString* preferredLang = [[NSUserDefaults standardUserDefaults] objectForKey:#"AppleLanguages"][0];
for (NSNumber *key in _languageSet) {
if ([_languageSet[key] isEqualToString:preferredLang]) {
lang = [key integerValue];
break;
}
}
}
return lang;
}
#end