iOS: How to call an post method, which contains some parameters and file(attachment)?

Question

What I did is that I can able to select an image/video/file from my iOS Device by using HSAttachmentPicker library.

In log I am getting file name with its extention and NSData/Base64 Encoded string.

Now I want to send this data through post API call.

Here is the my API call and its parameters,

Example:

http://www.jamboreebliss.com/sayar/public/api/v1/helpdesk/create?api_key=9p41T2XFZ34YRZJUNQAdmM7iV0Rr1CjN&token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOjI5LCJpc3MiOiJodHRwOi8vd3d3LmphbWJvcmVlYmxpc3MuY29tL3NheWFyL3B1YmxpYy9hcGkvdjEvYXV0aGVudGljYXRlIiwiaWF0IjoxNTIzMDA5MzUzLCJleHAiOjE1MjMwMDk1OTMsIm5iZiI6MTUyMzAwOTM1MywianRpIjoiVFBXbmpHalpDZXdYQVFBViJ9.q6v0mvT9R9G5sx2P4jlTAWfUEKcnOPqyjjJsVTZEWvs&subject=Sample subject&first_name=Poonam&last_name=Patil&email=poonam.h1212@gmail.com

In this API call, http://www.jamboreebliss.com/sayar/public is my base URL,

api/v1/helpdesk/create this is the main API

and parameters are, api_key, token, first_name, last_name, email

up to this, it is working fine.

Now what I want is I want to send/forward/upload an attachment/data in this API call, its parameter name is media_attachment[] which takes a file.

I tried in Postman API its works fine (see below screenshot)

But I do not know how to implement this feature. (I do not know how to write code for this in Xcode)

How to call API call with media_attachment[] parameter its value i.e. file data?

Here is working code (without attachment):

// CreateTicket.m file

-(void)sumbitButtonClicked
{
    if ([[Reachability reachabilityForInternetConnection]currentReachabilityStatus]==NotReachable)
    {
        //connection unavailable
        [utils showAlertWithMessage:NO_INTERNET sendViewController:self];
        
    }else{


        NSString *url=[NSString stringWithFormat:@"%@helpdesk/create?api_key=%@&token=%@&subject=%@&first_name=%@&last_name=%@&email=%@",[userDefaults objectForKey:@"companyURL"],API_KEY,[userDefaults objectForKey:@"token"],_subjectView.text,_firstNameView.text,_lastNameView.text,_emailTextView.text];

MyWebservices *webservices=[MyWebservices sharedInstance];
      
[webservices httpResponsePOST:url parameter:@"" callbackHandler:^(NSError *error,id json,NSString* msg) {
                [[AppDelegate sharedAppdelegate] hideProgressView];
                
                if (error || [msg containsString:@"Error"]) {

         
                //some code

                }else if(error)  {
                        [self->utils showAlertWithMessage:[NSString stringWithFormat:@"Error-%@",error.localizedDescription] sendViewController:self];
                       
                    }
     if (json) {
                  
       NSLog(@"JSON-CreateTicket-%@",json);


      }
                 

}

Webservices.m file

 -(void)httpResponsePOST:(NSString *)urlString
                  parameter:(id)parameter
            callbackHandler:(callbackHandler)block{
        NSError *err;
        
        urlString = [urlString stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLFragmentAllowedCharacterSet]];
        
      
        
        NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:urlString]];
        
        [request addValue:@"application/json;charset=UTF-8" forHTTPHeaderField:@"Content-Type"];
        [request addValue:@"application/json" forHTTPHeaderField:@"Accept"];
        [request addValue:@"application/json" forHTTPHeaderField:@"Offer-type"];
        [request setTimeoutInterval:45.0];
        
        NSData *postData = nil;
        if ([parameter isKindOfClass:[NSString class]]) {
            postData = [((NSString *)parameter) dataUsingEncoding:NSUTF8StringEncoding];
        } else {
         
            
            postData = [NSJSONSerialization dataWithJSONObject:parameter options:kNilOptions error:&err];
        }
        [request setHTTPBody:postData];
        //[request setHTTPBody:[NSJSONSerialization dataWithJSONObject:parameter options:nil error:&err]];
        
        [request setHTTPMethod:@"POST"];
        //
        NSLog(@"Request body %@", [[NSString alloc] initWithData:[request HTTPBody] encoding:NSUTF8StringEncoding]);
        NSLog(@"Thread--httpResponsePOST--Request : %@", urlString);
        NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] ];
        
        
        [[session dataTaskWithRequest:request completionHandler:^(NSData * data, NSURLResponse * response, NSError * error) {
            if (error) {
                dispatch_async(dispatch_get_main_queue(), ^{
                    block(error,nil,nil);
                });
                NSLog(@"dataTaskWithRequest error: %@", [error localizedDescription]);
                
            }else if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
                
                NSInteger statusCode = [(NSHTTPURLResponse *)response statusCode];
                
                if (statusCode != 200) {
                    NSLog(@"dataTaskWithRequest HTTP status code: %ld", (long)statusCode);
                    
                   
                        }
        
                NSString *replyStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
                
                
            
                
                NSError *jsonerror = nil;
                
                id responseData =  [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&jsonerror];
                
                dispatch_async(dispatch_get_main_queue(), ^{
                    block(jsonerror,responseData,nil);
                });
                
            }
            
        }] resume];
        
    }