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

Blur Background für eine View in Swift:

Dieser Code muss in die viewDidLoad Funktion:

view.backgroundColor = .clear
let blurEffect = UIBlurEffect(style: .extralight)
let blurView = UIVisualEffectView(effect: blurEffect)
blurView.translatesAutoresizingMaskIntoConstraints = false
view.insertSubview(blurView, at: 0)

NSLayoutConstraint.activate([
  blurView.topAnchor.constraint(equalTo: view.topAnchor),
  blurView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
  blurView.heightAnchor.constraint(equalTo: view.heightAnchor),
  blurView.widthAnchor.constraint(equalTo: view.widthAnchor)
])