Localization at run time for iOS app - ios

Question

I want to change my app language at runtime. For that I had implemented the category class like
.h file.
#interface NSBundle (Language)
+ (void)setLanguage:(NSString *)language;
#end
.m file
#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);
[[NSNotificationCenter defaultCenter] postNotificationName:#"changeLanguage" object:self];
}
and at button click change the language like [NSBundle setLanguage:langCode];
but now I am bit confusing that what should I write to set label text like
lbl.text = ?
because it still need to restart my app to show effect of language .

Answer 1

iOS already have a localization file for multiple languages, you can find it in Localization/Localizable.strings.
In Localizable.strings (English)
"text" = "This is a text";
Then, put your setting text code in a function. So that, you can redraw the text after switching language.
func loadText() {
lbl.text = String.localizedString("text")
}
func changeLanguage() { // Change Language Notification
loadText()
}