Swift学习笔记：swiftui修改toolbar/titlebar

let contentView = ContentView().environment(\.managedObjectContext, persistentContainer.viewContext).frame(minWidth: 450, maxWidth: .infinity, minHeight: 400, maxHeight: .infinity)

        // Create the titlebar accessory
        let titlebarAccessoryView = TitlebarAccessory().padding([.top, .leading, .trailing], 16.0).edgesIgnoringSafeArea(.all)
        let accessoryHostingView = NSHostingView(rootView:titlebarAccessoryView)
        accessoryHostingView.frame.size = accessoryHostingView.fittingSize

        let titlebarAccessory = NSTitlebarAccessoryViewController()
        titlebarAccessory.view = accessoryHostingView
        titlebarAccessory.layoutAttribute = .trailing

        
        // 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.setFrame(CGRect(x: 10, y: 10, width: 550, height: 650), display: true)
        window.center()
        window.addTitlebarAccessoryViewController(titlebarAccessory)
        window.backgroundColor = NSColor.white
        //window.minSize =  NSSize(width: 500, height: 400)
        //window.setFrameAutosaveName("Main Window")
        window.contentView = NSHostingView(rootView: contentView)
        window.makeKeyAndOrderFront(nil)

在Appdelegate文件里加上

let titlebarAccessoryView = TitlebarAccessory().padding([.top, .leading, .trailing], 16.0).edgesIgnoringSafeArea(.all)
        let accessoryHostingView = NSHostingView(rootView:titlebarAccessoryView)
        accessoryHostingView.frame.size = accessoryHostingView.fittingSize

        let titlebarAccessory = NSTitlebarAccessoryViewController()
        titlebarAccessory.view = accessoryHostingView
        titlebarAccessory.layoutAttribute = .trailing

以及

window.addTitlebarAccessoryViewController(titlebarAccessory)

新建一个TitlebarAccessory.swift的文件，内容如下：

import SwiftUI

struct TitlebarAccessory: View {
    var body: some View {
        Text("hello")
    }
}

运行