iOS 判断字符串中含有某个字符串 rangeOfString

//判断roadTitleLab.text 是否含有qingjoin
            if([roadTitleLab.text rangeOfString:@"qingjoin"].location !=NSNotFound)//_roaldSearchText
            {
                NSLog(@"yes");
            }
            else 
            {
                NSLog(@"no");
            }