Force localize image or image assets - ios

Question

As in this question, How to force NSLocalizedString to use a specific language
I can force localise by this method.
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
After that, I need to localise image and as a result, I do like this.
Localize Asset Catalogs
Problem is when I change localisation programmatically, it never change image.
[NSBundle setLanguage:#"en"];
Only my string are changed. How shall I do? I have tried with both normal image and image in assets like this. But it doesn't work unless I really change my phone language in setting. But I need to change/force localisation programmatically and image need to be changed (not only text). May I know how to do?

Answer 1

I know that is an old question but still answering for future reference.
Make sure that you set your app language in the main.m, it works like a charm for the images.
OBS : Not using xcassets.
Like this:
int main(int argc, char * argv[])
{
#autoreleasepool
{
NSString *language = <Get Your Language from somewhere> // I user NSUserDefaults for that
if (language == nil)
{
// Gets the device current language
language = [[[[NSBundle mainBundle] preferredLocalizations] objectAtIndex:0] substringToIndex:2];
}
[NSBundle setLanguage:language];
return UIApplicationMain(argc, argv, nil, NSStringFromClass([YourAppDelegate class]));
}
}
Additionally I have this method on the BundleEx implementation. It is not needed for the localized images but I needed it for .html templates I had, for instance.
- (NSString *)pathForResource:(NSString *)name ofType:(NSString *)ext
{
NSBundle *bundle = objc_getAssociatedObject(self, &_bundle);
NSString *pathName = [bundle pathForResource:name ofType:ext];
return pathName ?: [super pathForResource:name ofType:ext];
}