UNUserNotificationCenter Swift - 在特定情況下不觸發本地通知

Question

我在應用程序中使用本地通知時遇到問題。

我正在安排包含自定義內容和自定義操作類別的本地通知。 它在 iOS 11 中調度和觸發，但不在 iOS 10 中。

根據文檔，它也應該在 iOS 10 中工作。

請檢查我的代碼，並告訴我為什么它在這種特定情況下不起作用。

代碼如下。

AppDelegate.swift

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

    .......

    if #available(iOS 10.0, *) {
        UNUserNotificationCenter.current().delegate = self
    }
    .......

    return true
}

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

    completionHandler([.alert, .sound, .badge])
}

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

    print("Local Notification :: ", response)
}

自定義操作代碼

func configureNotificationCenter() {

    let actionRemindAgain = UNNotificationAction(identifier: NTConstants.LocalNotification.action.remindMeAgain, title: "Remind me Again!⏰", options: [.authenticationRequired])
    let actionViewDetails = UNNotificationAction(identifier: NTConstants.LocalNotification.action.viewDetails, title: "View Details!", options: [.foreground])
    let actionClose = UNNotificationAction(identifier: NTConstants.LocalNotification.action.dismiss, title: "Dismiss", options: [])

    //Event Category
    let eventCategory = UNNotificationCategory(identifier: NTConstants.LocalNotification.category.reminder, actions: [actionRemindAgain, actionViewDetails, actionClose], intentIdentifiers: [], options: [])

    //Register Category
    UNUserNotificationCenter.current().setNotificationCategories([eventCategory])
}

附表代碼

func scheduleLocalNotification() {

    self.configureNotificationCenter()

    //Local Notification
    let content = UNMutableNotificationContent()
    content.title = notifyTitle
    content.subtitle = notifySubTitle
    content.body = notifyDesc

    //Category
    content.categoryIdentifier = "reminder"

    //Trigger
    let scheduleDate = Date(timeIntervalSince1970: TimeInterval(scheduleTimeInterval / 1000)) //My Schedule Data
    let triggerDate = Calendar.current.date(byAdding: .hour, value: -2, to: scheduleDate) // Should be call before 2 hours
    let dateComponents = Calendar.current.dateComponents([.year, .month, .day, .hour, .minute], from: triggerDate!)

    let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: false)

    //Request
    let request = UNNotificationRequest(identifier: "notification_\((notifyId))", content: content, trigger: trigger)

    //Add Request
    UNUserNotificationCenter.current().add(request) { (error) in
        if let error = error {
            NTPrint("Unable to add notification : \(error.localizedDescription)")
        }
        else {
            NTPrint("Scheduled :: ", request.identifier)
        }
    }
}

此代碼成功運行並安排了本地通知。 結果如下：

<UNNotificationRequest: 0x18d65360; 

identifier: notification_111, 

content: <UNNotificationContent: 0x18daead0; 

    title: Event..!!, 
    subtitle: 31 Mar at 2:00 PM to 01 Apr at 12:00 PM, 
    body: , 
    categoryIdentifier: reminder, 
    launchImageName: , 
    peopleIdentifiers: (), 
    threadIdentifier: , 
    attachments: (), 
    badge: (null), 
    sound: (null), 
    hasDefaultAction: YES, 
    defaultActionTitle: (null), 
    shouldAddToNotificationsList: YES, 
    shouldAlwaysAlertWhileAppIsForeground: NO, 
    shouldLockDevice: NO, 
    shouldPauseMedia: NO, 
    isSnoozeable: NO, 
    fromSnooze: NO, 
    darwinNotificationName: (null), 
    darwinSnoozedNotificationName: (null), 

    trigger: <UNCalendarNotificationTrigger: 0x18d51470; 
        dateComponents: <NSDateComponents: 0x18da3320>
        Calendar Year: 2018
        Month: 3
        Leap month: no
        Day: 31
        Hour: 12
        Minute: 00, 
    repeats: NO
>>

正如我在 2 小時前設置的那樣，它在中午 12 點正確設置。
它在 iOS 11 台設備上運行良好。 但不能在 iOS 10 工作。
更新的代碼有什么問題嗎？ 或者其他任何需要處理的。

請讓我知道解決方案。
提前致謝。

Answer 1

要生成本地 Notification， Content.body不能為 null 或為空。

萬一在解析blank到 body 時，iOS 10 不會生成本地推送。 但它在 iOS 11 工作。

Content.body的值是關鍵問題。