Chage font in attributed string, but save styles

NSMutableAttributedString+setFontButSaveStyle.h

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface NSMutableAttributedString (setFontButSaveStyle)

- (void)setFontButSaveStyle:(UIFont *)font;
@end

NSMutableAttributedString+setFontButSaveStyle.m

#import "NSMutableAttributedString+setFontButSaveStyle.h"


@implementation NSMutableAttributedString (setFontButSaveStyle)


-(void)setFontButSaveStyle:(UIFont *)font
{
    [self enumerateAttributesInRange:NSMakeRange(0, self.length)
                             options:NSAttributedStringEnumerationLongestEffectiveRangeNotRequired
                          usingBlock:^(NSDictionary *attributes, NSRange range, BOOL *stop)
                          {
                              NSMutableDictionary *newAttributes = [attributes mutableCopy];
                              //Do changes
                              if ([newAttributes objectForKey:NSFontAttributeName])
                              {
                                  UIFont *currentFont = (UIFont *)[attributes objectForKey:NSFontAttributeName];
                                  UIFontDescriptorSymbolicTraits currntSymbolicTraits = currentFont.fontDescriptor.symbolicTraits;

                                  UIFont *newFont = font;
                                  UIFontDescriptor *newFontDescriptior = [newFont.fontDescriptor fontDescriptorWithSymbolicTraits:currntSymbolicTraits];
                                  newFont = [UIFont fontWithDescriptor:newFontDescriptior size:newFont.fontDescriptor.pointSize];

                                  [newAttributes setValue:newFont forKey:NSFontAttributeName];
                              }
                              [self addAttributes:newAttributes range:range]; //Apply effects
                          }];
}
@end