Send a POST request Objective-C - objective-c

Question

I need to send a POST request to a website to load more results of the page (There is about 200 results that I want to parse (using TFHpple) but the page is showing just 40 and you need to click "Show More Results" at the button to load more).
I tried to search the web how to send a POST request and I tried but it hasn't succeeded :( Can anyone help me figure it out?
General information:
Remote Address:212.117.156.55:80
Request URL:http://www.d.co.il/DOTNET/ajax/GetMoreResults
Request Method:POST
Status Code:200 OK
File Name: GetMoreResults
If there is any additional information required, just write in and I'll give you it.
Thank you very much!
Am I done this right?
NSURL *url=[NSURL URLWithString:#"http://www.d.co.il/SearchResults/?query=%D7%A9%D7%95%D7%A4%D7%A8%D7%A1%D7%9C&type=tag&location="];
NSData *data=[NSData dataWithContentsOfURL:url];
TFHpple *parser=[TFHpple hppleWithHTMLData:data];
NSString *XpathQueryString=#"//p[contains(#class, \"result-contact-address\")]";
NSArray *Nodes=[parser searchWithXPathQuery:XpathQueryString];
NSError *error;
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];
NSURL *postUrl = [NSURL URLWithString:#"http://www.d.co.il/DOTNET/ajax/GetMoreResults"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:postUrl
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
[request addValue:#"GetMoreResults" forHTTPHeaderField:#"Content-Type"];
[request addValue:#"GetMoreResults" forHTTPHeaderField:#"Accept"];
[request setHTTPMethod:#"POST"];
NSDictionary *mapData = [[NSDictionary alloc] initWithObjectsAndKeys: #"1", #"batchNumber",
#"IOS TYPE", #"typemap",
nil];
NSData *postData = [NSJSONSerialization dataWithJSONObject:mapData options:0 error:&error];
[request setHTTPBody:postData];
NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
}];
[postDataTask resume];
int i=1;
for (TFHppleElement *element in Nodes) {
NSString *address = element.text;
NSLog(#"%#,%d",address,i);
i++;
}

Answer 1

Step 1 : You need to build a service which takes the batchNumber and feeds you data belonging to that batch. So, initially you would send batchNumber = 0 and server returns you first 40 records.
Step 2 : On UI side, return 1 count more than the count of data records you have in hand to show. That additional count is for the last cell Show More.
Step 3 : On tap on Show More, increase your current batchNumber by 1 and make the server call to get the next batch records.
Step 4 : Continue step 2 & 3 util all records are loaded.
Finally, this is how you load server data using a post request:
NSError *error;
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];
NSURL *url = [NSURL URLWithString:#"[JSON SERVER"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
[request addValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request addValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setHTTPMethod:#"POST"];
NSDictionary *mapData = [[NSDictionary alloc] initWithObjectsAndKeys: #"TEST IOS", #"name",
#"IOS TYPE", #"typemap",
nil];
NSData *postData = [NSJSONSerialization dataWithJSONObject:mapData options:0 error:&error];
[request setHTTPBody:postData];
NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
}];
[postDataTask resume];