How to Call a View Controller Programmatically

How to call a View Controller programmatically?

To create a view controller:

UIViewController * vc = [[UIViewController alloc] init];

To call a view controller (must be called from within another viewcontroller):

[self presentViewController:vc animated:YES completion:nil];

For one, use nil rather than null.

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Loading a view controller from the storyboard:

NSString * storyboardName = @"MainStoryboard"; 
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:storyboardName bundle: nil];
UIViewController * vc = [storyboard instantiateViewControllerWithIdentifier:@"IDENTIFIER_OF_YOUR_VIEWCONTROLLER"];
[self presentViewController:vc animated:YES completion:nil];

Identifier of your view controller is either equal to the class name of your view controller, or a Storyboard ID that you can assign in the identity inspector of your storyboard.

Swift programmatically navigate to another view controller/scene

Swift 5

The default modal presentation style is a card. This shows the previous view controller at the top and allows the user to swipe away the presented view controller.

To retain the old style you need to modify the view controller you will be presenting like this:

newViewController.modalPresentationStyle = .fullScreen

This is the same for both programmatically created and storyboard created controllers.

Swift 3

With a programmatically created Controller

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

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

With a StoryBoard created Controller

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)

programmatically present a new view controller in swift/programmatically give a class an Identifier

If you aren't using the storyboard you don't need an identifier. Just instantiate and present it.

let loadVC = SelectionScreen()
self.present(loadVC, animated: true, completion: nil)

Programmatically navigate to another view controller/scene

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)

Presenting a view controller programmatically in swift

Do you want to present navController modally?

if yes, this is the answer

self.presentViewController(navController, animated: true, completion: nil)

"self" is the current view controller that will present the navController

And put it like this,

class ViewController: UIViewController {       

    override func viewDidLoad() {
        super.viewDidLoad()

        var theButton = UIButton()

        // Add the event to button
        theButton.addTarget(self, action: "buttonTouchInside:", forControlEvents: .TouchUpInside)

        self.view.addSubview(theButton)
    }

    func buttonTouchInside(sender:UIButton!)
    {
        // When the button is touched, we're going to present the view controller

        // 1. Wrap your view controller within the navigation controller

        let navController = UINavigationController(rootViewController: yourViewController)

        // 2. Present the navigation controller

        self.presentViewController(navController, animated: true, completion: nil)
    }

}

But,

If you want to navigate between viewController in the navigationController, you can use

self.navigationController.pushViewController(viewControllerToPush, animated: true)

How to go from one view controller in One storyboard to another viewcontroller in another storyboard programmatically?

Please follow below steps.

1. Check your both view controllers StoryboardID (If Storyboard ID is already inserted then skip step 2).
2. Insert View controller StoryboardID

Please check sample image of StoryboardID

Sample Code

   UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:"YourStoryBoardName" bundle:nil];
   UIViewController  *loginViewController = [storyBoard instantiateViewControllerWithIdentifier:"LoginViewController"];
   // If Login View Controller is not a Navigation Controller then you need to create Navigation Controller
   UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:loginViewController];
   [self.navigationController pushViewController:viewController animated:true];

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