最小化应用程序iOS时如何每隔特定N天推送本地通知？

Posted 2023-02-23

【中文标题】最小化应用程序iOS时如何每隔特定N天推送本地通知？

【英文标题】：How to push local notification every specific N days when minimize app iOS?

【发布时间】：2019-02-25 10:34:05

【问题描述】：

如何在特定 N 天从 DB 获取特定时间（例如：上午 9:00）推送本地通知。我尝试使用计时器来添加通知，但是当我最小化应用程序时，似乎计时器是 suppense。这是我的代码：

func createTriggerLocalPushNotification(completion: @escaping(Error?) -> ()) 

    var date = Date()
    date.hour = 12
    date.minute = 0
    date.second = 0
    var timeInterval = 86400 * 3 // Default 3 day
    var timeBuffer:TimeInterval = 0
    guard let inActivePushString = RealmUserInfo.shared.getValue(with: keyInActiveTimePush),
        let inActivePushTime = Int(inActivePushString), inActivePushTime > 0 else 
        log.info("Can't trigger inActivePushTime")
            return
    

    date.add(.day, value: inActivePushTime)

    if #available(ios 10.0, *) 
        timeInterval = 86400 * inActivePushTime
        timeBuffer = date.timeIntervalSinceNow

        let content = UNMutableNotificationContent()
        content.body = self.contentMessage
        content.sound = UNNotificationSound.default
        content.categoryIdentifier = self.inActiveTimePushNotificationCategory

        // Buffer trigger when first time
        var dateComponents = DateComponents()
        dateComponents.day = Date().day + inActivePushTime
        dateComponents.hour = 12
        dateComponents.minute = 0
        let firstTrigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: false)
        let requestBuffer = UNNotificationRequest(identifier: self.bufferInActiveTimePushNotification, content: content, trigger: firstTrigger)
        UNUserNotificationCenter.current().add(requestBuffer, withCompletionHandler: nil)

        // Create content
        Timer.scheduledTimer(withTimeInterval: timeBuffer, repeats: false)  (timer) in
            // Create trigger
            let trigger = UNTimeIntervalNotificationTrigger(timeInterval: TimeInterval(timeInterval), repeats: true)
            let request = UNNotificationRequest(identifier: self.inActiveTimePushNotification, content: content, trigger: trigger)
            UNUserNotificationCenter.current().add(request, withCompletionHandler: nil)
            
        completion(nil)
     else 
        // Fallback on earlier versions
        let content = UILocalNotification()
        content.alertBody = contentMessage
        content.soundName = UILocalNotificationDefaultSoundName
        content.category = inActiveTimePushNotification
        content.fireDate = date
        content.repeatInterval = .day
        UIApplication.shared.scheduleLocalNotification(content)
        completion(nil)
    

【参考方案1】：

在 3 天后设置本地推送通知，具体时间为晚上 10:00，当用户打开应用程序或每次我们可以在前台输入应用程序时 applicationDidBecomeActive 委托方法，在这种方法中，如果存在旧的本地推送通知，您需要删除并在 3 天后与特定时间重置。

查看此帖子以设置 N 天的本地推送通知。 Repeating local notifications for specific days of week (Swift 3 IOS 10)

【讨论】：

在那些文章中，看起来我们可以按工作日、日期...等获取日期组件，这对我没有帮助。目前我可以在接下来的 N 天设置通知。但我不知道如何自动重置它。像这样： var dateComponents = DateComponents() dateComponents.day = Date().day + 3 dateComponents.hour = 12 dateComponents.minute = 0 let firstTrigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: false)