iOS开发 multipart 上传多张图片

- (void)uploade:(NSDictionary *)dic pic:(NSArray *)picArray {
    NSString *hyphens = @"--";
    NSString *boundary = @"*****";
    NSString *end = @" ";
   
    NSMutableData *myRequestData1 = [NSMutableData data];
    //参数的集合的所有key的集合
    NSArray *keys= [dic allKeys];
    //添加其他参数
    for(int i = 0;i < [keys count];i ++)
    {
       
        NSMutableString *body = [[NSMutableString alloc]init];
        [body appendString:hyphens];
        [body appendString:boundary];
        [body appendString:end];
        //得到当前key
        NSString *key = [keys objectAtIndex:i];
        //添加字段名称
        [body appendFormat:@"Content-Disposition: form-data; name="%@"%@%@",key,end,end];
       
        //添加字段的值
        [body appendFormat:@"%@",[dic objectForKey:key]];
        [body appendString:end];
        [myRequestData1 appendData:[body dataUsingEncoding:NSUTF8StringEncoding]];
        NSLog(@"添加字段的值==%@",[dic objectForKey:key]);
    }
    //遍历数组，添加多张图片
    for (int i = 0; i < picArray.count; i ++) {
       
        //所有字段的拼接都不能缺少，要保证格式正确
        [myRequestData1 appendData:[hyphens dataUsingEncoding:NSUTF8StringEncoding]];
        [myRequestData1 appendData:[boundary dataUsingEncoding:NSUTF8StringEncoding]];
        [myRequestData1 appendData:[end dataUsingEncoding:NSUTF8StringEncoding]];
       
        NSMutableString *fileTitle = [[NSMutableString alloc]init];
        //要上传的文件名和key，服务器端用file接收
        [fileTitle appendFormat:@"Content-Disposition: form-data; name="img%d"; filename="pic_%d"%@",i,i,end];
        [fileTitle appendString:[NSString stringWithFormat:@"Content-Type:image/jpeg%@%@",end,end]];
       
        [myRequestData1 appendData:[fileTitle dataUsingEncoding:NSUTF8StringEncoding]];
        [myRequestData1 appendData:picArray[i]];
        [myRequestData1 appendData:[end dataUsingEncoding:NSUTF8StringEncoding]];
    }
   
    [myRequestData1 appendData:[hyphens dataUsingEncoding:NSUTF8StringEncoding]];
    [myRequestData1 appendData:[boundary dataUsingEncoding:NSUTF8StringEncoding]];
    [myRequestData1 appendData:[hyphens dataUsingEncoding:NSUTF8StringEncoding]];
    [myRequestData1 appendData:[end dataUsingEncoding:NSUTF8StringEncoding]];
   
    //根据url初始化request
    NSURL *URL = [[NSURL alloc] initWithString:[NSString stringWithFormat:@"%@addAppCollecting",SERVER_ADDRESS]];
    request = [[NSMutableURLRequest alloc] initWithURL:URL cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:30];
    //http method
    [request setHTTPMethod:@"POST"];
    //设置HTTPHeader中Content-Type的值
    NSString *content = [[NSString alloc]initWithFormat:@"multipart/form-data; boundary=%@",boundary];
    //设置HTTPHeader
    [request setValue:content forHTTPHeaderField:@"Content-Type"];
    //设置Content-Length
    NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[myRequestData1 length]];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
   
    //设置http body
    [request setHTTPBody:myRequestData1];
    _connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    [_connection start];
}

#pragma mark - connection delegate
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
    NSLog(@"reveive Response: %@",response);
}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{
    if (!_reveivedData) {
        _reveivedData = [[NSMutableData alloc]init];
    }
    [_reveivedData appendData:data];
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection{
    NSError *err;
    NSDictionary *note = [NSJSONSerialization JSONObjectWithData:_reveivedData  options:NSJSONReadingMutableContainers error:&err];
   
    if ([note[@"success"] integerValue] == 1) {
        [ICAPI hudWithText:@"添加成功!" atView:self.view];
       
        self.custom = nil;
        self.addressInfo = nil;
        self.picArray = nil;
        self.infoArray = nil;
        self.signListArray = nil;
        customDic = [NSMutableDictionary dictionary];
        customDic[@"address"] = @"";
        customDic[@"customName"] = @"";
        [self.tableView reloadData];
       
    } else {
        [ICAPI hudWithText:netErrorMessage atView:self.view];
    }
}