NSAttributedString_Extension

NSAttributedString+Extension.h

#ifndef NSAttributedString_Extension_h
#define NSAttributedString_Extension_h

NS_ASSUME_NONNULL_BEGIN

@interface NSAttributedString (Extension)
+ (NSAttributedString *)stringWithFormat:(NSAttributedString *)format, ... NS_REQUIRES_NIL_TERMINATION;
@end

NS_ASSUME_NONNULL_END

#endif

NSAttributedString+Extension.m

#import "NSAttributedString+Extension.h"

@implementation NSAttributedString (Extension)
+ (NSAttributedString *)stringWithFormat:(NSAttributedString *)format, ...{
    va_list args;
    va_start(args, format);
    
    NSMutableAttributedString *mutableAttributedString = (NSMutableAttributedString*)[format mutableCopy];
    NSString *mutableString = [mutableAttributedString string];
    
    while (true) {
        NSAttributedString *arg = va_arg(args, NSAttributedString *);
        if(!arg) {
            break;
        }
        NSRange rangeOfStringToBeReplaced = [mutableString rangeOfString:@"%@"];
        [mutableAttributedString replaceCharactersInRange:rangeOfStringToBeReplaced withAttributedString:arg];
    }
    va_end(args);
    
    return mutableAttributedString;
}
@end