SwiftUI Mac：辅助窗口中的环境对象答案

【问题标题】：SwiftUI Mac: Environment Object in secondary WindowSwiftUI Mac：辅助窗口中的环境对象
【发布时间】：2021-03-29 16:36:19
【问题描述】：

我有一个使用 Xcode 12.4 的 Mac 应用开发人员

我发现了如何使用NSApp.sendAction(#selector(AppDelegate.openSecondaryWindow), to: nil, from: nil) 和以下代码设置和打开辅助窗口（有没有更好的方法？）。

问题是我想在SecondaryView 中访问ContentView 可以访问的同一个环境对象（global state）。如何做到这一点？


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)
        }
    }
}

【问题讨论】：

标签： swift macos swiftui

【解决方案1】：

直接申请SecondaryView，点赞

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

【讨论】：