What error u r exactly getting .. if this doesn't open the url u want to u have t oadd the following:-
Code:
NSString *string= [NSString stringWithFormat:@"http://xyz.hyperphp.com/abc.php?username=%@&password=%@",usernameField.tex t,passwordField.text];
NSString *urlstring = [string stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]
NSURL *url = [[NSURL alloc] initWithString:urlstring];