iOS 实现网络搜索中关键字高亮

/**
 * 网络搜索关键字高亮
 * string:          内容
 * searchString:    搜索关键字
 */
+ (NSMutableAttributedString *)rangeSearchLight:(NSString *)string searchString:(NSString *)searchString
{
    NSString *strAfterDecodeByUTF8AndURI = [searchString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSRange range = [string rangeOfString:strAfterDecodeByUTF8AndURI];
    NSMutableAttributedString *attr = [[NSMutableAttributedString alloc]initWithString:string];
    [attr setAttributes:@{NSForegroundColorAttributeName:SearchLightColor}
                  range:range];
    return attr;
}