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我正在使用 UNUserNotification 向用户发送本地通知。我想首先在我从时间选择器计算的开始时间发送通知。在第一次通知之后，我想每 15 分钟发送一次提醒。有没有办法为日历和时间间隔设置触发器？

let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "HH"
    let hour = dateFormatter.string(from: _notificationTime)

    dateFormatter.dateFormat = "mm"
    let minutes = dateFormatter.string(from: _notificationTime)

    var dateComponents = DateComponents()
    dateComponents.hour = Int(hour)
    dateComponents.minute = Int(minutes)
    let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: true)

    let content = UNMutableNotificationContent()
    content.body = "Hi " + settings.username + ".\nHast du deine Pille schon genommen?"
    content.categoryIdentifier = "takePill"
    content.userInfo = ["customData": "takePill"]
    content.sound = UNNotificationSound.default()

    if let path = Bundle.main.path(forResource: "DontForget", ofType: "PNG") {
        let url = URL(fileURLWithPath: path)

        do {
            let attachment = try UNNotificationAttachment(identifier: "DontForget", url: url, options: nil)
            content.attachments = [attachment]
        } catch {
            print("The attachment was not loaded.")
        }
    }

    let pillTakenAction = UNNotificationAction(identifier: "pillTakenAction", title: "Pille eingenommen", options: [])
    let pillTakenCategory = UNNotificationCategory(identifier: "pillTakenCategory", actions: [pillTakenAction], intentIdentifiers: [], options: [])

    center.setNotificationCategories([pillTakenCategory])

    content.categoryIdentifier = "pillTakenCategory"

    let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
    center.add(request)
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1 回答 1

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UNNotificationTrigger具有repeats确定是否应重复通知的属性。通过将该属性设置为 true，您可以指定需要在给定日期重复通知。

在上面的代码中：

var dateComponents = DateComponents()
    dateComponents.hour = Int(hour)
    dateComponents.minute = Int(minutes)
    let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: true)

您已将该属性指定为 true，它将在特定时间重复通知dateComponents。

为此，您可以使用UNTimeIntervalNotificationTrigger. 首先，安排UNCalanderNotificationTrigger在您指定的时间。当此通知被调用时，userNotificationCenter(_ center:, didReceive response:, withCompletionHandler completionHandler:)您可以在函数中安排UNTimeIntervalNotificationTrigger每 15 分钟重复一次。

你的代码看起来像

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

let trigger = UNTimeIntervalNotificationTrigger(timeInterval: (15*60), repeats: true)

    let content = UNMutableNotificationContent()
    content.body = "Hi " + settings.username + ".\nHast du deine Pille schon genommen?"
    content.categoryIdentifier = "takePill"
    content.userInfo = ["customData": "takePill"]
    content.sound = UNNotificationSound.default()

    if let path = Bundle.main.path(forResource: "DontForget", ofType: "PNG") {
        let url = URL(fileURLWithPath: path)

        do {
            let attachment = try UNNotificationAttachment(identifier: "DontForget", url: url, options: nil)
            content.attachments = [attachment]
        } catch {
            print("The attachment was not loaded.")
        }
    }

    let pillTakenAction = UNNotificationAction(identifier: "pillTakenAction", title: "Pille eingenommen", options: [])
    let pillTakenCategory = UNNotificationCategory(identifier: "pillTakenCategory", actions: [pillTakenAction], intentIdentifiers: [], options: [])

    center.setNotificationCategories([pillTakenCategory])

    content.categoryIdentifier = "pillTakenCategory"

    let request = UNNotificationRequest(identifier: UUID().uuidString, content: content, trigger: trigger)
    center.add(request)
}

希望这可以帮助。:)

于 2017-01-27T10:35:31.200 回答