iOS 关于关键字高亮

- (NSMutableAttributedString *)colorStr: (NSString *)originalStr   // originalStr : 需要高亮传入的字符串

{

    NSMutableAttributedString *dataStr = [[[NSMutableAttributedString alloc] initWithString:originalStr] autorelease];

 

 for (int i = 0; i < originalStr.length - self.searchText.length + 1; i++) {

 

     if ([[originalStr substringWithRange:NSMakeRange(i, self.searchText.length)] isEqualToString:self.searchText ]) {

            NSRange range = NSMakeRange(i, self.searchText.length);

            [dataStr  addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(range.location, range.length)];

        }

    }

    return dataStr;

}