swift 通知未触发

Question

我是 swift 中通知的新手，在我的 AppDelegate.swift 文件中设置了以下内容。它运行并且我得到通知已设置并且没有错误的打印输出。我还获得了请求通知的权限，我单击“是”。我相信我的间隔通知应该在启动后 20 秒内触发。它不会触发，如果我在应用程序中或已最小化应用程序，这不会改变。请注意，我在 XCODE 的模拟器模式下运行。为什么我的通知没有触发？

    func setupNotifications(){

        let notificationCenter = UNUserNotificationCenter.current()

        notificationCenter.requestAuthorization(options: [.alert, .badge, .sound]) { (granted, error) in
            if granted {
                print("Yay!")
            } else {
                print("D'oh")
            }
        }

        notificationCenter.removeAllPendingNotificationRequests()
        print("setting up notifications")
        let content = UNMutableNotificationContent()
        content.title = "Answer your daily questions"
        content.body = "Answer your daily questions please"
        content.categoryIdentifier = "alarm"
        content.userInfo = ["customData": "fizzbuzz"]
        content.sound = UNNotificationSound.default

        //let trigger = UNTimeIntervalNotificationTrigger(timeInterval: (1*60), repeats: true)
        let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 20, repeats: false)

        // Create the request
        let request = UNNotificationRequest(identifier: "daily-notifier",
                    content: content, trigger: trigger)

        // Schedule the request with the system.
        notificationCenter.add(request) { (error) in
           if error != nil {
            print("there were errors to address")
              // Handle any errors.
           }
        }
        print("done setting up notifications")
    }

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

        let path = NSSearchPathForDirectoriesInDomains(.applicationSupportDirectory, .userDomainMask, true)
        print("\(path)")

        // Override point for customization after application launch.

        setupNotifications()  
        return true
    }

Answer 1

首先请注意，根据 Apple 的 requestAuthorization(options:completionHandler:)

文档，您可能应该先等待获得许可，然后再添加本地通知请求

Note: Always call this method before scheduling any local notifications and before registering with the Apple Push Notification service.

还要确保您已将推送通知添加为应用程序的一项功能，因为如果您提交它，将需要它。

在我运行上面的代码之后，当应用程序仍然处于活动状态时我没有收到通知，但是当应用程序处于后台时我确实收到了通知。我相信，如果用户收到处于活动状态的应用程序的通知，它会以静默方式发出；即，没有横幅和声音（至少这是我对通知的体验，尽管可能还有更多）。

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