Storyboard doesn't contain a view controller with identifier error? - swift

Question

I'm trying to present a programmatically made viewcontroller on a viewcontroller, where I can't figure out how to make ID of such made-up viewcontroller.
As can be seen in the code under, I have a base view controller, 'ViewController' and if I click a button(didTapButton) I want a programmatically made view controller(SecondViewController) show up.
Though I can't set the second view controller's name, that I can't even execute the code -- instantiateViewController(withIdentifier: "SecondController").
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
#IBAction func didTapButton(_ sender: Any) {
let controller = storyboard!.instantiateViewController(withIdentifier: "SecondController")
present(controller, animated: true)
}
}
......
class SecondViewController: UIViewController {
private var customTransitioningDelegate = TransitioningDelegate()
override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
super.init(nibName: "SecondController", bundle: nibBundleOrNil)
configure()
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
configure()
}
}
How can I set up the second view controller's ID? If it's not what should be done, what else can I try?

Answer 1

instantiateViewController lets you instanciate something that is defined in a given storyboard. So either you name it in the storyboard via xcode or you must do something else. For example, instanciate the object from code, ie let c=SecondViewController() (with appropriate parameters). You are trying to mix different ways to instanciate an object.

Answer 2

You don't need any identifiers for programmatically created vcs just do
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = .green
}
}
Use like
#IBAction func didTapButton(_ sender: Any) {
let vc = SecondViewController()
present(vc, animated: true)
}
Edit:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = .green
DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
let vc2 = SecondViewController()
vc2.providesPresentationContextTransitionStyle = true
vc2.definesPresentationContext = true
vc2.modalPresentationStyle = .overCurrentContext
self.present(vc2, animated: true)
}
}
}
class SecondViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let v = UIView()
v.backgroundColor = .red
view.addSubview(v)
v.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
v.centerXAnchor.constraint(equalTo: self.view.centerXAnchor),
v.centerYAnchor.constraint(equalTo: self.view.centerYAnchor),
v.widthAnchor.constraint(equalToConstant:200),
v.heightAnchor.constraint(equalToConstant:200)
])
}
}