Swift 3 - 如何在特定日期设置本地通知

Question

我需要你的一个项目的帮助。
我有 3 个变量，一个用于日，另一个用于月，最后用于年。像那样 ：

var year = 2017 var month = 06 var day = 19

即使应用程序在我们处于这些变量的日期时关闭，我也想发送通知，但我对日历和日期不太擅长。我只是暂时制作了这个应用程序。

let myNotification = Notification.Name(rawValue:"MyNotification")

override func viewDidLoad() {
    super.viewDidLoad()

    let nc = NotificationCenter.default
    nc.addObserver(forName:myNotification, object:nil, queue:nil, using:catchNotification)
}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    let nc = NotificationCenter.default
    nc.post(name:myNotification,
            object: nil,
            userInfo:["message":"Hello there!", "date":Date()])
}

func catchNotification(notification:Notification) -> Void {
    print("Catch notification")

    guard let userInfo = notification.userInfo,
        let message  = userInfo["message"] as? String,
        let date     = userInfo["date"]    as? Date else {
            print("No userInfo found in notification")
            return
    }

    let alert = UIAlertController(title: "Notification!",
                                  message:"\(message) received at \(date)",
        preferredStyle: UIAlertControllerStyle.alert)
    alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
    self.present(alert, animated: true, completion: nil)
}

先感谢您

Answer 1

您需要设置本地通知并使用 aUNCalendarNotificationTrigger在特定日期触发它。

let dateComponents = DateComponents(year: year, month: month, day: day)
let yourFireDate = Calendar.current.date(from: dateComponents)
let content = UNMutableNotificationContent()
content.title = NSString.localizedUserNotificationString(forKey:
            "Your notification title", arguments: nil)
content.body = NSString.localizedUserNotificationString(forKey: "Your notification body", arguments: nil)
content.categoryIdentifier = "Your notification category"
content.sound = UNNotificationSound.default()
content.badge = 1

let dateComponents = Calendar.current.dateComponents(Set(arrayLiteral: Calendar.Component.year, Calendar.Component.month, Calendar.Component.day), from: yourFireDate)
let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: false)
let request = UNNotificationRequest(identifier: "Your notification identifier", content: content, trigger: trigger)
UNUserNotificationCenter.current().add(request, withCompletionHandler: { error in
        if let error = error {
            //handle error
        } else {
            //notification set up successfully
        }
}