Programmatically navigate to another view controller/scene

I got an error message during navigating from first view controller to second view controller. My coding is like this one

let vc = LoginViewController(nibName: "LoginViewController", bundle: nil)
self.navigationController?.pushViewController(vc, animated: true)

The problem is I always got this kind of error message

2014-12-09 16:51:08.219 XXXXX[1351:60b] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Could not load NIB in bundle: 'NSBundle </var/mobile/Applications/FDC7AA0A-4F61-47E7-955B-EE559ECC06A2/XXXXX.app> (loaded)' with name 'LoginViewController''
*** First throw call stack:
(0x2efcaf0b 0x39761ce7 0x2efcae4d 0x31b693f9 0x31ac1eaf 0x3191e365 0x317fe895 0x318a930d 0x318a9223 0x318a8801 0x318a8529 0x318a8299 0x318a8231 0x317fa305 0x3147631b 0x31471b3f 0x314719d1 0x314713e5 0x314711f7 0x3146af1d 0x2ef96039 0x2ef939c7 0x2ef93d13 0x2eefe769 0x2eefe54b 0x33e6b6d3 0x3185d891 0x4ccc8 0x4cd04 0x39c5fab7)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

I already found the answer

Swift 4

let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let nextViewController = storyBoard.instantiateViewController(withIdentifier: "nextView") as! NextViewController
self.present(nextViewController, animated:true, completion:nil)

Swift 3

let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)

let nextViewController = storyBoard.instantiateViewControllerWithIdentifier("nextView") as NextViewController
self.presentViewController(nextViewController, animated:true, completion:nil)

Try this one. Here "LoginViewController" is the storyboardID specified in storyboard.

See below

let secondViewController = self.storyboard?.instantiateViewControllerWithIdentifier("LoginViewController") as LoginViewController
self.navigationController?.pushViewController(secondViewController, animated: true)

XCODE 8.2 AND SWIFT 3.0

Present an exist UIViewController

let loginVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController
self.present(loginVC, animated: true, completion: nil)

Push an exist UIViewController

let loginVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "LoginViewController") as! LoginViewController
self.navigationController?.pushViewController(loginVC, animated: true)

Remember that you can put the UIViewController Identifier following the next steps:

• Select Main.storyboard
• Select your UIViewController
• Search the Utilities in the right
• Select the identity inspector
• Search in section identity "Storyboard ID"
• Put the Identifier for your UIViewController

If you want to navigate to Controller created Programmatically, then do this:

let newViewController = NewViewController()
self.navigationController?.pushViewController(newViewController, animated: true)

If you want to navigate to Controller on StoryBoard with Identifier "newViewController", then do this:

let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let newViewController = storyBoard.instantiateViewController(withIdentifier: "newViewController") as! NewViewController
        self.present(newViewController, animated: true, completion: nil)