iOS上获取ip地址

- (NSString*)getWANIP{

    NSError*error;

    NSURL *ipURL = [NSURL URLWithString:@"http://pv.sohu.com/cityjson?ie=utf-8"];

    NSMutableString *ip = [NSMutableString stringWithContentsOfURL:ipURL encoding:NSUTF8StringEncoding error:&error];

    //   var returnCitySN = {"cip": "175.10.145.8", "cid": "430000", "cname": "湖南省"};

    //判断返回字符串是否为所需数据

    if ([ip hasPrefix:@"var returnCitySN = "]) {

         //删除字符串多余字符串

        NSRangerange =NSMakeRange(0,19);

        [ipdeleteCharactersInRange:range];

        NSString* nowIp =[ipsubstringToIndex:ip.length-1];

        //将字符串转换成二进制进行Json解析

        NSData* data = [nowIpdataUsingEncoding:NSUTF8StringEncoding];

        NSDictionary* dict = [NSJSONSerializationJSONObjectWithData:data          options:NSJSONReadingMutableContainerserror:nil];

        NSLog(@"%@",dict);   

        returndict[@"cip"] ? dict[@"cip"] :@"";

    }

    return@"";

}