Programming iOS 13 by Matt Neuburg

Author:Matt Neuburg
Language: eng
Format: epub
Publisher: O'Reilly Media
Published: 2019-12-26T16:00:00+00:00

class DetailViewController: UIViewController { var lab : UILabel! var boy : String = "" { didSet { if self.lab != nil { self.lab.text = self.boy } } } override func viewDidLoad() { super.viewDidLoad() self.view.backgroundColor = .white let lab = UILabel() lab.translatesAutoresizingMaskIntoConstraints = false self.view.addSubview(lab) NSLayoutConstraint.activate([ lab.topAnchor.constraint( equalTo: self.view.safeAreaLayoutGuide.topAnchor, constant: 100), lab.centerXAnchor.constraint( equalTo: self.view.centerXAnchor) ]) self.lab = lab self.lab.text = self.boy } }

Our app delegate (or, in iOS 13, our scene delegate) constructs the interface by creating a UISplitViewController, giving it its two initial children, and putting its view into the window:

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