SwiftUI 使用键盘快捷键调用 NSPopover

问题描述

我正在使用适用于 macOS Big Sur 的 SwiftUI 构建菜单栏应用程序，但不知道如何使用键盘快捷键打开弹出窗口（该应用程序的主窗口，因为它是一个菜单栏应用程序）。我希望用户能够通过按 Command + [a letter] 来查看窗口，而不管他们在计算机上做什么（当然只要应用程序是打开的）。下面是控制弹出框的主要函数和代码：

@main
struct MenuBarPopoverApp: App {
    @NSApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
    var body: some Scene {
        Settings{
            EmptyView()
        }
        .commands {
            MenuBarPopoverCommands(appDelegate: appDelegate)
        }
    }
}

class AppDelegate: NSObject,NSApplicationDelegate,ObservableObject {
    var popover = NSPopover.init()
    var statusBarItem: NsstatusItem?
    var contentView: ContentView!

    override class func awakeFromNib() {}
    
    func applicationDidFinishLaunching(_ notification: Notification) {
        print("Application launched")
        NSApplication.shared.activate(ignoringOtherApps: true)
        
        contentView = ContentView()
        popover.animates = false
        popover.behavior = .transient
        
        let contentVc = NSViewController()
        contentVc.view = NSHostingView(rootView: contentView.environmentObject(self))
        popover.contentViewController = contentVc

        statusBarItem = NsstatusBar.system.statusItem(withLength: NsstatusItem.variableLength)
        let itemImage = NSImage(named: "statusBarIcon")
        itemImage?.istemplate = true
        statusBarItem?.button?.image = itemImage
        statusBarItem?.button?.action = #selector(AppDelegate.togglePopover(_:))
    }
    
    @objc func showPopover(_ sender: AnyObject?) {
        if let button = statusBarItem?.button {
            NSApplication.shared.activate(ignoringOtherApps: true)
            popover.show(relativeto: button.bounds,of: button,preferredEdge: NSRectEdge.minY)
        }
    }

    @objc func closePopover(_ sender: AnyObject?) {
        popover.performClose(sender)
    }

    @objc func togglePopover(_ sender: AnyObject?) {
        if popover.isShown {
            closePopover(sender)
        } else {
            showPopover(sender)
        }
    }
}

还有 MenuBarPopoverCommands（应用程序的主要部分是一个文本编辑器，所以我有一堆与之相关的键盘快捷键）：

struct MenuBarPopoverCommands: Commands {
    
    let appDelegate: AppDelegate
    
    init(appDelegate: AppDelegate) {
        self.appDelegate = appDelegate
    }
    
    var body: some Commands {
        CommandMenu("Edit") {
            Section {
                Button("Cut") {
                    appDelegate.contentView.editCut()
                }.keyboardShortcut(KeyEquivalent("x"),modifiers: .command)
                
                Button("copy") {
                    appDelegate.contentView.editcopy()
                }.keyboardShortcut(KeyEquivalent("c"),modifiers: .command)
                
                Button("Paste") {
                    appDelegate.contentView.editPaste()
                }.keyboardShortcut(KeyEquivalent("v"),modifiers: .command)
                
                Button("Undo") {
                    appDelegate.contentView.undo()
                }.keyboardShortcut(KeyEquivalent("z"),modifiers: .command)
                
                Button("Redo") {
                    appDelegate.contentView.redo()
                }.keyboardShortcut(KeyEquivalent("z"),modifiers: [.command,.shift])
                
                Button("Bold") {
                    appDelegate.contentView.bold()
                }.keyboardShortcut(KeyEquivalent("b"),modifiers: .command)
                
                Button("Italic") {
                    appDelegate.contentView.italic()
                }.keyboardShortcut(KeyEquivalent("i"),modifiers: .command)
                
                Button("Select All") {
                    appDelegate.contentView.editSelectAll()
                }.keyboardShortcut(KeyEquivalent("a"),modifiers: .command)
            }
        }
    }
}

解决方法

Swift 5 解决方案在 https://stackoverflow.com/a/58225397/3984522 中提出。然而，有一个很好的包，它在几行代码中完成了 https://github.com/soffes/HotKey 的工作：

import SwiftUI
import HotKey

@main
struct MenuBarPopoverApp: App {
    @NSApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
    var body: some Scene {
        Settings{
            EmptyView()
        }
        .commands {
            MenuBarPopoverCommands(appDelegate: appDelegate)
        }
    }
}

class AppDelegate: NSObject,NSApplicationDelegate,ObservableObject {
    var popover = NSPopover.init()
    var statusBarItem: NSStatusItem?
    var contentView: ContentView!
    let hotKey = HotKey(key: .x,modifiers: [.control,.shift])  // Global hotkey
    
    override class func awakeFromNib() {}
    
    func applicationDidFinishLaunching(_ notification: Notification) {
        print("Application launched")
        NSApplication.shared.activate(ignoringOtherApps: true)
        
        contentView = ContentView()
        popover.animates = false
        popover.behavior = .transient
        
        let contentVc = NSViewController()
        contentVc.view = NSHostingView(rootView: contentView.environmentObject(self))
        popover.contentViewController = contentVc
        
        statusBarItem = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)
        let itemImage = NSImage(systemSymbolName: "eye",accessibilityDescription: "eye")
        itemImage?.isTemplate = true
        statusBarItem?.button?.image = itemImage
        statusBarItem?.button?.action = #selector(AppDelegate.togglePopover(_:))
        
        hotKey.keyUpHandler = {                                 // Global hotkey handler
            self.togglePopover()
        }
    }
    
    @objc func showPopover(_ sender: AnyObject? = nil) {
        if let button = statusBarItem?.button {
            NSApplication.shared.activate(ignoringOtherApps: true)
            popover.show(relativeTo: button.bounds,of: button,preferredEdge: NSRectEdge.minY)
        }
    }
    
    @objc func closePopover(_ sender: AnyObject? = nil) {
        popover.performClose(sender)
    }
    
    @objc func togglePopover(_ sender: AnyObject? = nil) {
        if popover.isShown {
            closePopover(sender)
        } else {
            showPopover(sender)
        }
    }
}