GettingStartedwith-SwiftUI-2

GettingStartedwith-SwiftUI-2.swift

// Create the SwiftUI view that provides the window contents.
let contentView = ContentView()

// Use a UIHostingController as window root view controller.
if let windowScene = scene as? UIWindowScene {
    // cast UIScene instance to UIWindowScene to assign that scene to UIWindow.
    let window = UIWindow(windowScene: windowScene)
    // Use UIHostingController to create  a view controller for SwiftUI view contentView.
    window.rootViewController = UIHostingController(rootView: contentView)
    // assign UIWindow instance to your delegate's window object to make it display when app launch happens. 
    self.window = window
    // at the end, make it visible.
    window.makeKeyAndVisible()
}