SwiftUI macOS：辅助窗口中的环境对象

Question

我有一个使用 Xcode 12.4 的 Mac 应用程序开发人员。

我已经找到了如何使用

NSApp.sendAction(#selector(AppDelegate.openSecondaryWindow), to: nil, from: nil)

设置和打开辅助窗口。 （有更好的办法吗？）

问题是我想在

SecondaryView

中访问

globalState

可以访问的相同环境对象

ContentView

。如何做到这一点？

我的代码：

class AppDelegate: NSObject, NSApplicationDelegate {
    var secondaryWindow: NSWindow!

    func applicationDidFinishLaunching(_ notification: Notification) {
       [...]
    }
    
    func applicationWillFinishLaunching(_ notification: Notification) {
        NSWindow.allowsAutomaticWindowTabbing = false
    }
    
    func applicationShouldTerminateAfterLastWindowClosed(_ app: NSApplication) -> Bool {
        return true
    }

    func applicationWillTerminate(_ notification: Notification) {
        [...]
    }
    
    @objc func openSecondaryWindow () {
        if self.secondaryWindow == nil {
            let secondaryView = SecondaryView()
            
            self.secondaryWindow = NSWindow(
                contentRect: NSRect(x: 20, y: 20, width: 480, height: 300),
                styleMask: [.titled, .closable, .miniaturizable, .resizable, .fullSizeContentView],
                backing: .buffered,
                defer: false)
            self.spreadWindow.contentView = NSHostingView(rootView: secondaryView)
        }
        
        self.spreadWindow.makeKeyAndOrderFront(nil)
    }
}

@main
struct MyApp: App {
    @StateObject var globalState: GlobalState = GlobalState.shared
    
    @NSApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
        
    var body: some Scene {
        WindowGroup {
            ContentView()
                .environmentObject(self.globalState)
        }
    }
}

Answer 1

直接应用到

SecondaryView

，就像

    @objc func openSecondaryWindow () {
        if self.secondaryWindow == nil {
            let secondaryView = SecondaryView()
                .environmentObject(GlobalState.shared)      // << here !!