没有为NSMenu调用validateMenuItem或menuWillOpen [英] validateMenuItem or menuWillOpen not called for NSMenu
问题描述
我的Mac应用程序有一个NSMenu，其调用函数 validateMenuItem 和 menuWillOpen 从未被调用.到目前为止，在线解决方案都没有帮助.
My Mac app has an NSMenu whose delegate functions validateMenuItem and menuWillOpen are never called. So far none of the solutions online have helped.
似乎我在做所有正确的事情:
It seems like I'm doing everything right:
- 菜单项的选择器位于同一类中.
- 管理它的类继承自NSMenuDelegate
我认为描述我的问题的最好方法是发布相关代码.任何帮助将不胜感激.
I suppose the best way to describe my problem is to post the relevant code. Any help would be appreciated.
import Cocoa
class UIManager: NSObject, NSMenuDelegate {
var statusBarItem = NSStatusBar.system().statusItem(withLength: -2)
var statusBarMenu = NSMenu()
var titleMenuItem = NSMenuItem()
var descriptionMenuItem = NSMenuItem()
// ...
override init() {
super.init()
createStatusBarMenu()
}
// ...
func createStatusBarMenu() {
// Status bar icon
guard let icon = NSImage(named: "iconFrame44")
else { NSLog("Error setting status bar icon image."); return }
icon.isTemplate = true
statusBarItem.image = icon
// Create Submenu items
let viewOnRedditMenuItem = NSMenuItem(title: "View on Reddit...", action: #selector(viewOnRedditAction), keyEquivalent: "")
let saveThisImageMenuItem = NSMenuItem(title: "Save This Image...", action: #selector(saveThisImageAction), keyEquivalent: "")
// Add to title submenu
let titleSubmenu = NSMenu(title: "")
titleSubmenu.addItem(descriptionMenuItem)
titleSubmenu.addItem(NSMenuItem.separator())
titleSubmenu.addItem(viewOnRedditMenuItem)
titleSubmenu.addItem(saveThisImageMenuItem)
// Create main menu items
titleMenuItem = NSMenuItem(title: "No Wallpaperer Image", action: nil, keyEquivalent: "")
titleMenuItem.submenu = titleSubmenu
getNewWallpaperMenuItem = NSMenuItem(title: "Update Now", action: #selector(getNewWallpaperAction), keyEquivalent: "")
let preferencesMenuItem = NSMenuItem(title: "Preferences...", action: #selector(preferencesAction), keyEquivalent: "")
let quitMenuItem = NSMenuItem(title: "Quit Wallpaperer", action: #selector(quitAction), keyEquivalent: "")
// Add to main menu
let statusBarMenu = NSMenu(title: "")
statusBarMenu.addItem(titleMenuItem)
statusBarMenu.addItem(NSMenuItem.separator())
statusBarMenu.addItem(getNewWallpaperMenuItem)
statusBarMenu.addItem(NSMenuItem.separator())
statusBarMenu.addItem(preferencesMenuItem)
statusBarMenu.addItem(quitMenuItem)
statusBarItem.menu = statusBarMenu
}
// ...
// Called whenever the menu is about to show. we use it to change the menu based on the current UI mode (offline/updating/etc)
override func validateMenuItem(_ menuItem: NSMenuItem) -> Bool {
NSLog("Validating menu item")
if (menuItem == getNewWallpaperMenuItem) {
if wallpaperUpdater!.state == .Busy {
DispatchQueue.main.async {
self.getNewWallpaperMenuItem.title = "Updating Wallpaper..."
}
return false
} else if wallpaperUpdater!.state == .Offline {
DispatchQueue.main.async {
self.getNewWallpaperMenuItem.title = "No Internet Connection"
}
return false
} else {
DispatchQueue.main.async {
self.preferencesViewController.updateNowButton.title = "Update Now"
}
return true
}
}
return true
}
// Whenever the menu is opened, we update the submitted time
func menuWillOpen(_ menu: NSMenu) {
NSLog("Menu will open")
if !noWallpapererImageMode {
DispatchQueue.main.async {
self.descriptionMenuItem.title = "Submitted \(self.dateSimplifier(self.updateManager!.thisPost.attributes.created_utc as Date)) by \(self.updateManager!.thisPost.attributes.author) to /r/\(self.updateManager!.thisPost.attributes.subreddit)"
}
}
}
// ...
// MARK: User-initiated actions
func viewOnRedditAction() {
guard let url = URL(string: "http://www.reddit.com\(updateManager!.thisPost.permalink)")
else { NSLog("Could not convert post permalink to URL."); return }
NSWorkspace.shared().open(url)
}
// Present a save panel to let the user save the current wallpaper
func saveThisImageAction() {
DispatchQueue.main.async {
let savePanel = NSSavePanel()
savePanel.makeKeyAndOrderFront(self)
savePanel.nameFieldStringValue = self.updateManager!.thisPost.id + ".png"
let result = savePanel.runModal()
if result == NSFileHandlingPanelOKButton {
let exportedFileURL = savePanel.url!
guard let lastImagePath = UserDefaults.standard.string(forKey: "lastImagePath")
else { NSLog("Error getting last post ID from persistent storage."); return }
let imageData = try! Data(contentsOf: URL(fileURLWithPath: lastImagePath))
if (try? imageData.write(to: exportedFileURL, options: [.atomic])) == nil {
NSLog("Error saving image to user-specified folder.")
}
}
}
}
func getNewWallpaperAction() {
updateManager!.refreshAndReschedule(userInitiated: true)
}
func preferencesAction() {
preferencesWindow.makeKeyAndOrderFront(nil)
NSApp.activateIgnoringOtherApps(true)
}
func quitAction() {
NSApplication.shared().terminate(self)
}
}
推荐答案
menuWillOpen:属于 NSMenuDelegate 协议；要使其成为有问题的菜单，需要一个委托:
menuWillOpen: belongs to the NSMenuDelegate protocol; for it to be called the menu in question needs a delegate:
let statusBarMenu = NSMenu(title: "")
statusBarMenu.delegate = self
validateMenuItem:属于 NSMenuValidation 非正式协议；要使其称为相关菜单 items ，必须具有 target .以下段落摘自Apple的应用程序菜单和弹出窗口列表编程主题文档:
validateMenuItem: belongs to the NSMenuValidation informal protocol; for it to be called the relevant menu items must have a target. The following passage is taken from Apple's Application Menu and Pop-up List Programming Topics documentation:
使用自动菜单启用时，每当发生用户事件时，NSMenu都会更新每个菜单项的状态.要更新菜单项的状态，NSMenu首先确定菜单项的目标，然后确定目标是否实现validateMenuItem:或validateUserInterfaceItem :(按该顺序).
When you use automatic menu enabling, NSMenu updates the status of every menu item whenever a user event occurs. To update the status of a menu item, NSMenu first determines the target of the item and then determines whether the target implements validateMenuItem: or validateUserInterfaceItem: (in that order).
let myMenuItem = NSMenuItem()
myMenuItem.target = self
myMenuItem.action = #selector(doSomething)
这篇关于没有为NSMenu调用validateMenuItem或menuWillOpen的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
