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SOLVED: How to set view controller entry point in appdelegate

Forums > macOS

Hi everyone,

I am trying to programmatically set "viewController" as an entry point in appdelegate. However, I keep getting this error message "Generic class 'NSHostingView' requires that 'NSStoryboard' conform to 'View'" . The error is happening with this line of code: "window.contentView = NSHostingView(rootView: contentViewController)". Any feedback is appreciated, thank you for your time.

func applicationDidFinishLaunching(_ aNotification: Notification) {
        // Create the SwiftUI view that provides the window contents.
        let contentViewController = NSStoryboard(name: "Main.storyboard", bundle: nil)

        // Create the window and set the content view. 
        window = NSWindow(
            contentRect: NSRect(x: 0, y: 0, width: 480, height: 300),
            styleMask: [.titled, .closable, .miniaturizable, .resizable, .fullSizeContentView],
            backing: .buffered, defer: false)

        window.center()
        window.setFrameAutosaveName("Main Window")
        window.contentView = NSHostingView(rootView: contentViewController)
        window.makeKeyAndOrderFront(nil)
    }

   

NSHostingView is used to embed a SwiftUI View object into an AppKit view hierarchy. You are trying to embed an AppKit ViewController. Can't do that.

If you are using SwiftUI, you won't be instantiating views from storyboards. You need to assign a View object to NSHostingView(rootView:)

   

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