This code works well on iOS 6
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:textView.text];
[attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:[textView.text rangeOfString:self.searchString options:NSCaseInsensitiveSearch range:searchRange]];
[textView setAttributedText:attributedString];
However NSForegroundColorAttributeName is undefined in iOS 5, so I want the equivalent of the previous code that works in iOS 5.
The equivalent is to use the kCTForegroundColorAttributeName with a CGColorRef for the color.
See my CoreText introduction here: http://www.cocoanetics.com/2011/01/befriending-core-text/