Objective c post request not sending the data - ios

Question

Good day.Im trying to send simple post data to server.This is the code how i do it.
-(void)makeRequest:(NSString*)stringParameters{
NSError *error;
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];
NSURL *url = [NSURL URLWithString:#"http://vaenterprises.webatu.com/Authentication.php"];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
[request addValue:#"application/text" forHTTPHeaderField:#"Content-Type"];
[request addValue:#"application/text" forHTTPHeaderField:#"Accept"];
[request setHTTPMethod:#"POST"];
NSString* postData = #"tag=hello&username=yo&something=something";
[request setHTTPBody:postData];
NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
[self parseJson:data];
}];
[postDataTask resume];
}
It looks great till i echo the whole post from php side like this
echo json_encode($_POST);
and i print the result in the iOS like this
-(void)parseJson:(NSData*) data{
NSString *myString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSError *jsonError = nil;
NSDictionary* jsonObject= [NSJSONSerialization JSONObjectWithData:data options:0 error:&jsonError];
NSLog(#"%#",myString);
}
this issue is that i get empty string..so it means that post data not being send and that is 10000 percent objective c side issue and i have no clue why its so as in this method we only got setHttpBody with the actual string which contains key and value separated by & but that data not being send as you can see.So what am i doing wrong?Please tell somebody

Answer 1

Http body has to be of type NSData. Try out following code
NSString* stringData = #"tag=hello&username=yo&something=something";
NSData* data = [stringData dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:data];