如何使用 SwiftUI 将项目添加到 NSToolbar？

Question

考虑使用应用委托生命周期实现的这个 macOS 应用代码：

应用委托：

func applicationDidFinishLaunching(_ aNotification: Notification) {
        let contentView = ContentView()
        window = NSWindow(
            contentRect: NSRect(x: 0, y: 0, width: 480, height: 300),
            styleMask: [.titled, .closable, .miniaturizable, .resizable, .fullSizeContentView],
            backing: .buffered, defer: false)
        window.toolbar = NSToolbar(identifier: "toolbar")
        window.title = "hello title"
        window.subtitle = "hello subtitle"
        window.isReleasedWhenClosed = false
        window.center()
        window.setFrameAutosaveName("Main Window")
        window.contentView = NSHostingView(rootView: contentView)
        window.makeKeyAndOrderFront(nil)
    }

SwiftUI：

struct ContentView: View {
    var body: some View {
        NavigationView {
            List {
                NavigationLink(
                    destination: ItemView(),
                    label: {
                        Label("Something", systemImage: "folder.circle")
                    })
                NavigationLink(
                    destination: ItemView(),
                    label: {
                        Label("Another", systemImage: "pencil.tip.crop.circle")
                    })
            }.listStyle(SidebarListStyle())
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity)
        .toolbar {
            ToolbarItem {
                Button(action: {
                    print("Button clicked")
                }, label: {
                    Label("Hello", systemImage: "pencil.circle")
                })
            }
        }
    }
}
struct ItemView: View {
    var body: some View {
        Text("Hello, World!")
            .frame(maxWidth: .infinity, maxHeight: .infinity)
            .toolbar {
                ToolbarItem {
                    Button(action: {
                        print("Item button")
                    }, label: {
                        Label("Itemtool", systemImage: "lock.doc")
                    })
                }
            }
    }
}

它的作用：正确设置窗口和工具栏的外观。工具栏虽然没有按钮。它看起来像这样：

我想做的事：将 SwiftUI 添加的工具栏项添加到工具栏中。

当我拥有由 SwiftUI 应用程序生命周期管理的窗口时，一切都按预期工作。但是，出于不相关的原因，我需要坚持应用程序委托的生命周期。

这可能吗？如何将 SwiftUI 中的工具栏按钮添加到应用委托创建的窗口的工具栏？

Answer 1

在 macOS 11 beta 6 和 Xcode 12 beta 6 上：

内容视图：

import SwiftUI

struct ContentView: View {
    var body: some View {
        NavigationView {
            List {
                NavigationLink(
                    destination: ItemView(),
                    label: {
                        Label("Something", systemImage: "folder.circle")
                    })
                NavigationLink(
                    destination: ItemView(),
                    label: {
                        Label("Another", systemImage: "pencil.tip.crop.circle")
                    })
            }.listStyle(SidebarListStyle())
            .toolbar {
                ToolbarItem {
                    Button(action: {
                        print("Button clicked")
                    }, label: {
                        Label("Hello", systemImage: "pencil.circle")
                    })
                }
            }
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity)
        /* move into the NavigationView
        .toolbar {
            ToolbarItem {
                Button(action: {
                    print("Button clicked")
                }, label: {
                    Label("Hello", systemImage: "pencil.circle")
                })
            }
        }
        */
 
    }
}

struct ItemView: View {
    var body: some View {
        Text("Hello, World!")
            .frame(maxWidth: .infinity, maxHeight: .infinity)
            .navigationTitle("hello title")  // add title
            .navigationSubtitle("hello subtitle")  // add sub title
            .toolbar {
                ToolbarItem {
                    Button(action: {
                        print("Item button")
                    }, label: {
                        Label("Itemtool", systemImage: "lock.doc")
                    })
                }
            }
    }
}

你需要一个 Appdelegate 类：

class AppDelegate: NSObject, NSApplicationDelegate, NSWindowDelegate {
    
    func applicationDidFinishLaunching(_ aNotification: Notification) {
    // do something
    }

    // others func

}

最后：

@main
struct SomeApp: App {
    
    @NSApplicationDelegateAdaptor(AppDelegate.self) var appDelegate

    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

结果：

enter image description here