在Swift macOS中，在NSButton旁边显示NSMenu

Question

单击按钮后，如何在NSButton旁边显示NSMenu？

这就是我目前所拥有的：

@IBOutlet weak var BtnMenu: NSButton!
// Menu
let appMenu = NSMenu()
let showPrefsMenuItem = NSMenuItem(title: "Preferences...", action: #selector(VC.showPrefs(_:)), keyEquivalent: "")
let showAboutMenuItem = NSMenuItem(title: "About", action: #selector(VC.showAbout(_:)), keyEquivalent: "")
let quitAppMenuItem = NSMenuItem(title: "Quit", action: #selector(VC.quitApp(_:)), keyEquivalent: "")
override func viewDidLoad() {
    super.viewDidLoad()
    // Set up menu
    self.appMenu.addItem(self.showPrefsMenuItem)
    self.appMenu.addItem(self.showAboutMenuItem)
    self.appMenu.addItem(NSMenuItem.separatorItem())
    self.appMenu.addItem(self.quitAppMenuItem)
}
// Shows the app menu
@IBAction func openMenu(sender: NSButton) {
    self.appMenu.popUpMenuPositioningItem(self.appMenu.itemAtIndex(0), atLocation: NSEvent.mouseLocation(), inView: nil)
}

但现在，菜单显示在鼠标位置。有没有办法在按钮旁边显示菜单？

谢谢。

Answer 1

我就是这样解决的：

let p = NSPoint(x: sender.frame.origin.x, y: sender.frame.origin.y - (sender.frame.height / 2))
self.appMenu.popUp(positioning: nil, at: p, in: sender.superview)

在这种情况下，菜单显示在单击的按钮下。

Answer 2

Swift 3。

在按钮下显示NSMenu：

    let p = NSPoint(x: 0, y: sender.frame.height)
    appMenu.popUp(positioning: nil, at: p, in: sender)

在按钮右侧显示NSMenu：

    let p = NSPoint(x: sender.frame.width, y: 0)
    appMenu.popUp(positioning: nil, at: p, in: sender)

Answer 3

只缺少传递发送者按钮。

约翰·艾勒曼回应：

 let p = NSPoint(x: sender.frame.origin.x, y: sender.frame.origin.y)
 self.appMenu.popUpMenuPositioningItem(self.appMenu.itemAtIndex(0), atLocation:p , inView: sender)

Answer 4

试试这个：

let p = NSPoint(x: sender.frame.origin.x, y: sender.frame.origin.y)
self.appMenu.popUpMenuPositioningItem(self.appMenu.itemAtIndex(0), atLocation:p , inView: nil)