gistfile1.m

  NSString *description = @"ABCDEFGHIJ";
  NSMutableAttributedString *aDescription = [[NSMutableAttributedString alloc] initWithString:description];
  
  [aDescription addAttributes:@{NSForegroundColorAttributeName: [UIColor redColor],
                                NSBackgroundColorAttributeName: [UIColor lightGrayColor],
                                NSUnderlineStyleAttributeName : @(NSUnderlineStyleSingle)}
                        range:NSRangeFromString(@"{2,5}")
   ];