如何从视图控制器移动到其他视图控制器在故事板编程

Question

I have create two view controller onto storyboard I wanted to go from one view controller to another view controller programmatically. I have create a button in one view controller. I know it very easy to go from one view controller to another just drag line from button from oneviewcontroller to second view controller. but I want to do it programmatically because I have if and else conditions in button when if condition true then I want to move it to next view controller this is the code.

-(IBAction)loadView:(id)sender {
    if([username.text isEqualToString:@"adnan"] && [password.text isEqualToString:@"bhatti123"] )
    {
        // here I want to write that code which reach me to second view controller which I implement on storyboard 

    }   
    else 
    {

    }
}

Answer 1

Drag line from first view controller to second and set the identifier for segue:

In the .m file:

if([username.text isEqualToString:@"adnan"] && [password.text isEqualToString:@"bhatti123"] )
{
    [self performSegueWithIdentifier:@"nextView" sender:sender];
}   
else 
{

}

Answer 2

-(IBAction)loadView:(id)sender
{
      if([username.text isEqualToString:@"adnan"] && [password.text isEqualToString:@"bhatti123"] )
      {
         // here i want to write that code which reach me to second view controller which i implement on storyboard 
            SecondViewController *objSecondViewController = [[SecondViewController alloc]initWithNibName:@"SecondViewController" bundle:nil];
            [self.navigationController pushViewController:objSecondViewController animated:YES];
            [objSecondViewController release];
     }   
     else 
     { 
        //write your else part code here
     }
}

UPDATE :

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle: nil]; 
SecondViewController *objSecondViewController = [storyboard instantiateViewControllerWithIdentifier:@"SecondViewController"];
[self.navigationController pushViewController:objSecondViewController animated:YES];

Answer 3

SecondViewController *secondviewController = [[SecondViewController alloc] init];
[self presentviewController:secondviewController animation:YES completion:nil];

Hope this helps...