使用 XCode 进行测试时，MacOS 应用程序本地通知未显示

Question

我尝试将横幅通知生成器添加到我的 macOS swift 应用程序中，但在 XCode 中运行测试时，横幅没有出现，并且通知中心中也没有任何新通知可见。我计算机上的其他应用程序会定期生成通知。我错过了什么？我已按要求授予许可

我的应用程序委托如下

class AppDelegate: NSObject, NSApplicationDelegate, NSUserNotificationCenterDelegate {

    @IBOutlet weak var mainMenu: NSMenu!

    func applicationDidFinishLaunching(_ aNotification: Notification)
        {
         NSUserNotificationCenter.default.delegate = self ;
        }

    func userNotificationCenter(_ center: NSUserNotificationCenter, shouldPresent notification: NSUserNotification) -> Bool
        {
        return true
        }

    func applicationWillTerminate(_ aNotification: Notification) {
        // Insert code here to tear down your application
    }

在应用程序启动时，我运行以下方法，并看到控制台行“允许通知”

let center = UNUserNotificationCenter.current()
center.requestAuthorization(options: [.alert, .sound, .badge, .provisional])
    { granted, error in
    if error != nil
       {
       print ("Request notifications permission Error");
       };
   if granted
       {
       self.allowNotifications = true ;
       print ("Notifications allowed");
       }
   else
       {
       self.allowNotifications = false ;
       print ("Notifications denied");
       };
 }

我添加到我的ViewController中的方法如下，我已经测试到达了最后的打印语句

func generateNotification (summary:String, sound:String, title:String , body:String)
    {
    let notification = NSUserNotification()
    if !allowNotifications {return};
    notification.title = summary ;
    notification.subtitle = title ;
    notification.informativeText = body ;
    if (sound == "YES") {notification.soundName = NSUserNotificationDefaultSoundName};
    NSUserNotificationCenter.default.deliver (notification);
    print ("notification generated");
    };

请帮我

Answer 1

我相信我的问题是请求使用 UNUserNotification 的权限，然后使用 NSUserNotification 创建通知本身，当然我没有请求使用权限。现在，在 Catalina 中请求许可是强制性的（也许在早期版本的 macOS 中也是如此。）

因此，我用以下代码替换了generateNotification函数，并且一切正常。

let notificationCenter = UNUserNotificationCenter.current();
notificationCenter.getNotificationSettings
   { (settings) in
   if settings.authorizationStatus == .authorized
       {
       //print ("Notifications Still Allowed");
       // build the banner
       let content = UNMutableNotificationContent();
       content.title = summary ;
       content.body = title ;
       if sound == "YES" {content.sound = UNNotificationSound.default};
       // could add .badge
       // could add .userInfo

       // define when banner will appear - this is set to 1 second - note you cannot set this to zero
      let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 1, repeats: false);

       // Create the request
       let uuidString = UUID().uuidString ; 
       let request = UNNotificationRequest(identifier: uuidString, content: content, trigger: trigger);

      // Schedule the request with the system.
      notificationCenter.add(request, withCompletionHandler:
         { (error) in
         if error != nil
             {
             // Something went wrong
             }
          })
      //print ("Notification Generated");
     }