IOS post request - ios7

Question

I have a button
When it is done click on the request and opens the following window
when return back to the previous screen and then press the button query is executed with any parameters
This button code
- (IBAction)loginClick:(id)sender {
if ([self.emailTextField.text isEqualToString:#""] || [self.passwordTextField.text isEqualToString:#""]) {
UIAlertView *falseAlert = [[UIAlertView alloc]initWithTitle:#"" message:#"Please enter your username and password" delegate:self cancelButtonTitle:nil otherButtonTitles:#"OK", nil];
[falseAlert show];
} else {
[spinner startAnimating];
// dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0ul);
// dispatch_async(queue, ^{
NSString *initialURL = [NSString stringWithFormat:#"https://www.-------"];
NSURL *url=[NSURL URLWithString:initialURL];
NSString *key = [NSString stringWithFormat:#"username=%#&password=%#&service=%#", self.emailTextField.text, self.passwordTextField.text, #"login"];
NSData *mastData = [key dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];
NSString *mastLength = [NSString stringWithFormat:#"%ld",[mastData length]];
NSError *error;
request = [[NSMutableURLRequest alloc] init];
[request setURL:url];
request.cachePolicy = NSURLRequestReloadIgnoringLocalAndRemoteCacheData;
[request setHTTPMethod:#"POST"];
[request setValue:mastLength forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:mastData];
NSURLResponse *response = NULL;
NSError *requestError = NULL;
responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&requestError];
NSString *responseString = [[NSString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSLog(#"%#", responseString);
info = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
request = NULL;
// dispatch_async(dispatch_get_main_queue(), ^{
if ([info[#"success"] isEqualToString:#"false"]) {
[self.errorLabel setHidden:FALSE];
[spinner stopAnimating];
[spinner setHidden:YES];
} else {
DounloadYatseykoViewController *newController = [self.storyboard instantiateViewControllerWithIdentifier:#"load"];
newController.dataInfo = responseData;
[self presentModalViewController:newController animated:YES];
}
//
// });
// });
}
//NSLog(#"%#", responseString);
}
So I go back to the previous screen
UIViewController *newController = [self.storyboard instantiateViewControllerWithIdentifier:#"login"];
[self presentViewController:newController animated:NO completion:nil];