how to set local notifications between 8am and 8pm every day

问题

So I am very new to Swift and I'm currently setting a repeating timer every 30 min after the app was launched, but i would like to only send notification between 8 am and 8 pm. Is it possible to do this without setting a reminder for each specific time?

This is how I'm currently doing this.

override func viewDidLoad(){

let notificationCenter = UNUserNotificationCenter.current()
notificationCenter.requestAuthorization(options: [.alert, .sound]) { (granted, error ) in
// enable or disable if needed.
    if granted {
        print("We have permission to send notifications")
    } else {
        print("We don't have the option to send notifications")
    }
}
notificationCenter.removeAllDeliveredNotifications()
notificationCenter.removeAllPendingNotificationRequests()

// The actual notification the user will receive
let notification    = UNMutableNotificationContent()
notification.title  = "You should have some water"
notification.body   = "It has been a long time since you had some water, why don't you have some."
notification.categoryIdentifier = "reminder"
notification.sound  = .default

let trigger     = UNTimeIntervalNotificationTrigger(timeInterval: (60*30), repeats: true)
let uuidString  = UUID().uuidString
let request     = UNNotificationRequest(identifier: uuidString, content: notification, trigger: trigger)
notificationCenter.add(request, withCompletionHandler: nil)
}

回答1:

Unfortunately you do need to add a notification request for each 30 minute interval in the 8am-8pm window. What is your aversion to this approach? It's a simple for-loop. Instead of using a UNTimeIntervalNotificationTrigger you would use a UNCalendarNotificationTrigger.

let notificationCenter = UNUserNotificationCenter.current()
notificationCenter.removeAllDeliveredNotifications()
notificationCenter.removeAllPendingNotificationRequests()

let startHour = 8
let totalHours = 12
let totalHalfHours = totalHours * 2

for i in 0...totalHalfHours {
    var date = DateComponents()
    date.hour = startHour + i / 2
    date.minute = 30 * (i % 2)
    print("\(date.hour!):\(date.minute!)")

    let notification = UNMutableNotificationContent()
    notification.title = "You should have some water"
    notification.body = "It has been a long time since you had some water, why don't you have some."
    notification.categoryIdentifier = "reminder"
    notification.sound  = .default

    let trigger = UNCalendarNotificationTrigger(dateMatching: date, repeats: true)
    let uuidString = UUID().uuidString
    let request = UNNotificationRequest(identifier: uuidString, content: notification, trigger: trigger)
    notificationCenter.add(request, withCompletionHandler: nil)
}

来源：https://stackoverflow.com/questions/61592561/how-to-set-local-notifications-between-8am-and-8pm-every-day

标签

swift

localnotification

unusernotificationcenter