[移动开发]OS X开发.第三章3.3NSStatusBar

3.3 NSStatusBar
NSStatusBar位于顶部状态栏的右侧，启用设置后会常驻任务栏显示相关信息或进行某操作。

3.3.1 基本声明
打开AppDelegate.swift文件，修改如下所示代码：

    var item: NSStatusItem!

    func applicationDidFinishLaunching(_ aNotification: Notification) {
        // Insert code here to initialize your application
        var statusBar = NSStatusBar.system
        
        // 决定任务栏顶部右侧出现的宽度
        item = statusBar.statusItem(withLength: 23)
        item.button?.target = self
        item.button?.action = #selector(statusListener)
        item.image = NSImage(named: "user")
        
        let menu = NSMenu()
        let menuItemOne = NSMenuItem(title: "Test1", action: #selector(statusListener), keyEquivalent: "T")
        menuItemOne.target = self
        menuItemOne.keyEquivalentModifierMask = .shift
        let menuItemTwo = NSMenuItem(title: "Test2", action: #selector(statusListener), keyEquivalent: "Y")
        menuItemTwo.target = self
        menuItemTwo.keyEquivalentModifierMask = .shift
        menu.addItem(menuItemOne)
        menu.addItem(menuItemTwo)
        
        let test2SubMenu = NSMenu()
        let menuItemTwoSubOne = NSMenuItem(title: "Sub1", action: #selector(statusListener), keyEquivalent: "U")
        menuItemTwoSubOne.target = self
        menuItemTwoSubOne.keyEquivalentModifierMask = .shift
        test2SubMenu.addItem(menuItemTwoSubOne)
        menuItemTwo.submenu = test2SubMenu
        
        item.menu = menu
        
    }

说明：NSStatusItem系NSStatusBar内菜单的管理类，可用来设置菜单及其子项；NSStatusBar系NSStatusItem的管理类，自身也可设置多项属性（如图片等）。

运行截图