how to go to another ViewController after successful login - iphone

Question

I am newbie for iPhone application. I have followed this tutorial for login from iPhone.
I have php file as below.
index.php
<?php
$user = $_POST['uname'];
if ($user == 'user') {
echo "Welcome to my site...";
} else {
echo "Invalid User";
}
?>
When I run application and enter username as user and password as some text, I get output as Welcome to my site....
Now instead of welcome message, I wanna go to my welcome screen i.e. View Controller that I have on story board. Any idea how to get this done?
Full code is as below.
-(IBAction)buttonClick:(id)sender
{
greeting.text= #"";
NSString* username = nameInput.text;
NSString* pass = passInput.text;
greeting.hidden = NO;
if([nameInput.text isEqualToString:#"" ] && [passInput.text isEqualToString:#""])
{
greeting.text = #"Please enter username and password.";
[nameInput resignFirstResponder];
[passInput resignFirstResponder];
return;
}
if([nameInput.text isEqualToString:#"" ])
{
greeting.text = #"Please enter username.";
[nameInput resignFirstResponder];
[passInput resignFirstResponder];
return;
}
if([passInput.text isEqualToString:#""])
{
greeting.text = #"Please enter password.";
[nameInput resignFirstResponder];
[passInput resignFirstResponder];
return;
}
NSString *post = [[NSString alloc] initWithFormat:#"uname=%#&pwd=%#",username,pass];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:#"%d", [postData length]];
NSURL *url = [NSURL URLWithString:#"http://localhost:8888/PhPTesting/index.php"];
NSMutableURLRequest *theRequest = [NSMutableURLRequest requestWithURL:url];
[theRequest setHTTPMethod:#"POST"];
[theRequest setValue:postLength forHTTPHeaderField:#"Content-Length"];
[theRequest setHTTPBody:postData];
NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
if( theConnection )
{
indicator.hidden = NO;
webData = [[NSMutableData data] retain];
}
else
{
}
[nameInput resignFirstResponder];
[passInput resignFirstResponder];
nameInput.text = nil;
passInput.text = nil;
}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[webData setLength: 0];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[webData appendData:data];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
[connection release];
[webData release];
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSString *loginStatus = [[NSString alloc] initWithBytes: [webData mutableBytes] length:[webData length] encoding:NSUTF8StringEncoding];
greeting.text = loginStatus;
[loginStatus release];
[connection release];
[webData release];
indicator.hidden = YES;
}

Answer 1

You can do this :
if ([loginStatus isEqualToString:#"Welcome to my site..."]) {
// Show welcome view controller
NextViewController *nextViewController = [self.storyboard instantiateViewControllerWithIdentifier:#"myNextView"];
[self.navigationController pushViewController:nextViewController animated:YES];
} else {
greeting.text = #"Login was not correct";
}
Here , #"myNextView" is a NextView Identifier.

Answer 2

You can check the result
if ([loginStatus isEqualToString:#"Welcome to my site..."]) {
// Show welcome view controller
} else {
greeting.text = #"Login was not correct";
}
I also suggest returning a more helpful string via PHP
UPDATE
There are tons of tutorials for presenting a new view.
Check out this here: Programatically Switching Views in Cocoa Touch