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
