当然如果你的项目大的话最好使用开源的网络库ASI或者AFNetWork,库里面都有现有的方法,

如果你觉得就是想自己写一个,看这里

- (NSMutableURLRequest *)PostImageRequest:(NSString *)URLString 
                                  UIImage:(UIImage*)image 
                               parameters:(NSDictionary *)parameters 
                                  success:(void (^)(id))success 
                                  failure:(void (^)(NSError *))failure 
{ 
    _success = success; 
    _failure = failure; 
    //分界线的标识符 
    NSString *TWITTERFON_FORM_BOUNDARY = @"AaB03x"; 
    //根据url初始化request 
    _request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:URLString] 
                                                           cachePolicy:NSURLRequestReloadIgnoringLocalCacheData 
                                                       timeoutInterval:10]; 
    //分界线 --AaB03x 
    NSString *MPboundary=[[NSString alloc]initWithFormat:@"--%@",TWITTERFON_FORM_BOUNDARY]; 
    //结束符 AaB03x-- 
    NSString *endMPboundary=[[NSString alloc]initWithFormat:@"%@--",MPboundary]; 
    //得到图片的data 
    NSData* data = UIImageJPEGRepresentation(image, 1); 
    //http body的字符串 
    NSMutableString *body=[[NSMutableString alloc]init]; 
    //参数的集合的所有key的集合 
    NSArray *keys= [parameters allKeys]; 
 
    //遍历keys 
    for(int i=0;i<[keys count];i++) 
    { 
        //得到当前key 
        NSString *key=[keys objectAtIndex:i]; 
        //如果key不是pic,说明value是字符类型,比如name:Boris 
        if(![key isEqualToString:@"pic"]) 
        { 
            //添加分界线,换行 
            [body appendFormat:@"%@\r\n",MPboundary]; 
            //添加字段名称,换2行 
            [body appendFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n",key]; 
            //添加字段的值 
            [body appendFormat:@"%@\r\n",[parameters objectForKey:key]]; 
        } 
    } 
 
    ////添加分界线,换行 
    [body appendFormat:@"%@\r\n",MPboundary]; 
    //声明pic字段,文件名为boris.png 
    [body appendFormat:@"Content-Disposition: form-data; name=\"ImageField\"; filename=\"x1234.png\"\r\n"]; 
    //声明上传文件的格式 
    [body appendFormat:@"Content-Type: image/jpeg\r\n\r\n"]; 
 
    //声明结束符:--AaB03x-- 
    NSString *end=[[NSString alloc]initWithFormat:@"\r\n%@",endMPboundary]; 
    //声明myRequestData,用来放入http body 
    NSMutableData *myRequestData=[NSMutableData data]; 
    //将body字符串转化为UTF8格式的二进制 
    [myRequestData appendData:[body dataUsingEncoding:NSUTF8StringEncoding]]; 
    //将image的data加入 
    [myRequestData appendData:data]; 
    //加入结束符--AaB03x-- 
    [myRequestData appendData:[end dataUsingEncoding:NSUTF8StringEncoding]]; 
 
    //设置HTTPHeader中Content-Type的值 
    NSString *content=[[NSString alloc] initWithFormat:@"multipart/form-data; boundary=%@",TWITTERFON_FORM_BOUNDARY]; 
    //设置HTTPHeader 
    [_request setValue:content forHTTPHeaderField:@"Content-Type"]; 
    //设置Content-Length 
    [_request setValue:[NSString stringWithFormat:@"%d", [myRequestData length]] forHTTPHeaderField:@"Content-Length"]; 
    //设置http body 
    [_request setHTTPBody:myRequestData]; 
    //http method 
    [_request setHTTPMethod:@"POST"]; 
     
    return _request; 
}
- (void)start 
{ 
    if (_request) { 
        _urlConnection = [[NSURLConnection alloc]initWithRequest:_request delegate:self]; 
    } 
    _request = nil; 
} 
 
- (void)syncStart 
{ 
    if (_request) { 
        NSError *error; 
        NSData *returnData = [NSURLConnection sendSynchronousRequest:_request returningResponse:nil error:&error]; 
        if (!error) { 
            NSString *receiveStr = [[NSString alloc]initWithData:returnData encoding:NSUTF8StringEncoding]; 
            _success(receiveStr); 
        } else { 
            _failure(error); 
        } 
    } 
    _request = nil; 
}
#pragma mark ---- NSURLConnectionDataDelegate ----- 
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response 
{ 
    //NSHTTPURLResponse *res = (NSHTTPURLResponse *)response; 
    //NSLog(@"%@",[res allHeaderFields]); 
} 
 
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data 
{ 
    [_responseData appendData:data]; 
} 
 
-(void)connectionDidFinishLoading:(NSURLConnection *)connection 
{ 
    NSString *receiveStr = [[NSString alloc]initWithData:_responseData encoding:NSUTF8StringEncoding]; 
    _success(receiveStr); 
} 
 
#pragma mark ---- NSURLConnectionDelegate ----- 
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error 
{ 
    _failure(error); 
}

使用方法:

[httpManager PostImageRequest:UploadImageUrl 
                          UIImage:image 
                       parameters:params 
                          success:^(id msg) { 
                              debugLog(@"upload image success:%@", msg); 
                              success(msg); 
                          
                          } failure:^(NSError *error) { 
                              failure(error); 
                          }]; 
     
    [httpManager start];

NSURLConnection的使用方法就不细说了,查看查询文档或者到网上找

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iOS网络操作与AFNetworking详解
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