How to POST data using JSON service in Objective c - ios

Question

I have made a login form. Fields r email and password. Now i want to POST the data from fields to specific url how it can be done. I'm totally new to IOS. Can anybody help me?? How to do HTTP request and JSON parsing?

Answer 1

/*********See this**********/
-(void)webServiceCall{
NSString *dataToSend = [NSString stringWithFormat:#"Username=%#&Password=%#“,<userIdEnter Here>,<Password enter here>];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
NSString *Length = [NSString stringWithFormat:#"%d",[postData length]];
[request setURL:[NSURL URLWithString:#“WEBURL”]];
[request setHTTPMethod:#"POST"];
[request setValue:Length forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:postData];
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
}
// check connection if you want
/*****get response in delegates*******/
- (void)connection:(NSURLConnection *)connection didReceiveResponse:
(NSURLResponse *)response {
// A response has been received, this is where we initialize the instance var you created
// so that we can append data to it in the didReceiveData method
// Furthermore, this method is called each time there is a redirect so reinitializing it
// also serves to clear it
_responseData = [[NSMutableData alloc] init];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data
{
/**************/
NSString* newStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSError* error;
NSDictionary* json = [NSJSONSerialization JSONObjectWithData:data
options:kNilOptions
error:&error];
// NSArray* latestLoans = [json objectForKey:#"loans"];
NSLog(#"json: %#", json);
[_responseData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(#"Error --> %#",error.localizedDescription);
/***************/
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSString *responseString = [[NSString alloc] initWithData:self.responseData encoding:NSUTF8StringEncoding];
NSError *error = nil;
id result = [NSJSONSerialization JSONObjectWithData:jsonData options:NSJSONReadingMutableContainers error:&error];
// use Result
self.responseData = nil;
}