- (BOOL) isBlankString:(NSString *)string {
    if (string == nil || string == NULL) {
        return YES;
    }
    if ([string isKindOfClass:[NSNull class]]) {
        return YES;
    }
    if ([[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] length]==0) {
        return YES;
    }
    return NO;
} 
 

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