NSURL 基本方法

NSURL *url = [NSURL URLWithString:@ "http://www.baidu.com/search?id=1" ];
    NSLog(@ "scheme:%@" , [url scheme]); //协议 http
    NSLog(@ "host:%@" , [url host]);     //域名 www.baidu.com
    NSLog(@ "absoluteString:%@" , [url absoluteString]); //完整的url字符串 http://www.baidu.com:8080/search?id=1
    NSLog(@ "relativePath: %@" , [url relativePath]); //相对路径 search
    NSLog(@ "port :%@" , [url port]);  // 端口 8080
    NSLog(@ "path: %@" , [url path]);  // 路径 search
    NSLog(@ "pathComponents:%@" , [url pathComponents]); // search
    NSLog(@ "Query:%@" , [url query]);  //参数 id=1