SwiftUI: Changing values in a Class - swift

Question

This is a menubar macOS app. I'm trying to change the dropdown window size with a button from the content view. This is my attempt so far.
struct ContentView: View {
#ObservedObject var app = AppDelegate()
var body: some View {
VStack{
Text("Hello World")
.padding(.top, 10)
Button {
biggerwindow()
} label: {
Image("tv")
}
}
}
func biggerwindow(){
app.popover.contentSize = NSSize(width: 800, height: 800 )
}
}
Nothing happens when clicking on the button.
This is the AppDelegate class that contains the default values
#NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate, ObservableObject {
var popover = NSPopover.init()
var statusBar: StatusBarController?
func applicationDidFinishLaunching(_ aNotification: Notification) {
// Create the SwiftUI view that provides the contents
let contentView = ContentView()
// Set the SwiftUI's ContentView to the Popover's ContentViewController
popover.contentViewController = MainViewController()
//default size of the menu bar window
popover.contentSize = NSSize(width: 360, height: 360 )
popover.contentViewController?.view = NSHostingView(rootView: contentView)
// Create the Status Bar Item with the Popover
statusBar = StatusBarController.init(popover)
}
func applicationWillTerminate(_ aNotification: Notification) {
// Insert code here to tear down your application
}

Answer 1

The problem is here:
#ObservedObject var app = AppDelegate()
You're creating a new instance of AppDelegate here, with its own instance of popover. You need to use the existing instance of AppDelegate that was created at app launch. You can access the existing instance through the global NSApplication.shared object.
struct ContentView: View {
var app: AppDelegate { NSApplication.shared.delegate as! AppDelegate }