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Make UIKit localizable via Localizable.strings
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#import <objc/runtime.h> | |
/** | |
To localize `UIBarButtonSystemItemDone` use "Done" key in your localizable.strings: | |
"Done" = "Localized_Done"; | |
*/ | |
__attribute__((constructor)) | |
static void Hack_NSBundle_localizedString () { | |
typedef NSString *(*Func)(NSBundle *, SEL, NSString *, NSString *, NSString *); | |
SEL sel = @selector(localizedStringForKey:value:table:); | |
Method m = class_getInstanceMethod([NSBundle class], sel); | |
Func imp = (Func)method_getImplementation(m); | |
NSBundle *mainBundle = [NSBundle mainBundle]; | |
#define DOUBLE_CALL | |
#ifdef DOUBLE_CALL | |
// This approach always calls the original implementation twice. | |
// First it gets the "original" value (from a system framework) and uses it | |
// as a default value for `localizedStringForKey` from app's bundle. | |
// For non-app strings it always makes two calls to the original implementation | |
// of `localizedStringForKey:value:table:`. | |
method_setImplementation(m, imp_implementationWithBlock(^NSString *(NSBundle *bundle, NSString *key, NSString *value, NSString *table) { | |
NSString *localized = imp(bundle, sel, key, value, table); | |
if (bundle != mainBundle) { | |
localized = imp(mainBundle, sel, key, localized, nil); | |
} | |
return localized; | |
})); | |
#else | |
// This method looks into the app's strings first, and goes into a framework | |
// only if the key was not found. | |
// | |
// It requires a trick with this `marker` value. | |
// [[NSBundle mainBundle] localizedStringForKey:@"Non-existent-key" value:nil table:nil] | |
// returns @"Non-existent-key" string but not `nil`. | |
// | |
// This fact makes it difficult to understand if the value for the key exists or not. | |
method_setImplementation(m, imp_implementationWithBlock(^NSString *(NSBundle *bundle, NSString *key, NSString *value, NSString *table) { | |
static NSString *marker = @"."; | |
NSString *localized = imp(mainBundle, sel, key, marker, nil); | |
if (bundle != mainBundle && [localized isEqualToString:marker]) { | |
localized = imp(bundle, sel, key, value, nil); | |
} | |
return localized; | |
})); | |
#endif | |
} |
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