如何在NSMenu中放置水平滑块(Swift 3,Xcode 8)

Question

从macOS Sierra开始,音量菜单栏项提供了一个水平滑块项来更改系统的音量:

我想为我自己的应用程序采用这个概念,并提出了以下类:

import Cocoa

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

    @IBOutlet weak var window: NSWindow!
    let statusItem = NSStatusBar.system().statusItem(withLength: -2)

    func applicationDidFinishLaunching(_ aNotification: Notification) {

        let menu = NSMenu()
        let menuItem = NSMenuItem()
        let statusSlider = NSSlider()

        menu.addItem(NSMenuItem(title: "Slider:", action: nil, keyEquivalent: ""))

        menuItem.title = "Slider 1"
        menuItem.view = statusSlider
        menu.addItem(menuItem)

        menu.addItem(NSMenuItem.separator())

        menu.addItem(NSMenuItem(title: "Quit", action: Selector("terminate:"), keyEquivalent: "q"))

        statusItem.image = NSImage(named: "NSStatusAvailable")
        statusItem.menu = menu
    }
}

但菜单中没有滑块显示.有谁知道我做错了什么？

Answer 1

NSSlider的初始帧大小为零.您需要在将其添加到菜单项之前设置大小.

statusSlider.setFrameSize(NSSize(width: 160, height: 16))