POST JSON from OBJ-C

gistfile1.txt

NSString *queryString = [NSString stringWithFormat:@"http://chrisrisner.com/Labs/day7test.php?name=%@", [self.txtName text]];
NSMutableURLRequest *theRequest=[NSMutableURLRequest
                          requestWithURL:[NSURL URLWithString:
                                          queryString]
                          cachePolicy:NSURLRequestUseProtocolCachePolicy
                          timeoutInterval:60.0];
NSDictionary* jsonDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
                                @"Value1", @"Key1",
                                @"Value2", @"Key2",
                                nil];
NSError *error;
NSData* jsonData = [NSJSONSerialization dataWithJSONObject:jsonDictionary
                       options:NSJSONWritingPrettyPrinted error:&error];
[theRequest setHTTPMethod:@"POST"];
[theRequest addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
 
// should check for and handle errors here but we aren't
[theRequest setHTTPBody:jsonData];

Ref : http://chrisrisner.com/31-Days-of-iOS--Day-8%E2%80%93Performing-Posts-and-setting-request-type