ios - 为什么本地通知没有为 UNCalendarNotificationTrigger 触发

Question

本地通知应该在 25-9-2021 发出。这是火灾时间的打印对象

▿ year: 2021 month: 9 day: 26 isLeapMonth: false

• year : 2021
• month : 9
• day : 25
• isLeapMonth : false

let content = UNMutableNotificationContent()
content.title = "Test title"
content.body = "sample test body"
var trigger:UNCalendarNotificationTrigger
let n = 1
let nextTriggerDate = Calendar.current.date(byAdding: .day, value: n, to: Date())!
let comps = Calendar.current.dateComponents([.year, .month, .day], from: nextTriggerDate)
trigger = UNCalendarNotificationTrigger(dateMatching: comps, repeats: false)
content.subtitle = "Sub title-Date-NonRepeat"
let request = UNNotificationRequest(identifier: "test.my.example", content: content, trigger: trigger)    
UNUserNotificationCenter.current().add(request) { Error in                        
    if let err = Error {
        print("Notification Error:\(String(describing: err))")
    }
}

我再次添加了日期与以下代码更改的时间

var comps = Calendar.current.dateComponents([.year, .month, .day], from: nextTriggerDate)
comps.day = 25
comps.hour = 12
comps.minute = 17
comps.second = 10

这是 comps 变量的 PO

var comps = Calendar.current.dateComponents([.year, .month, .day],from: nextTriggerDate)comps.day = 25comps.hour = 12comps.minute = 17comps.second = 10

我只给出了日期以查看它是否会触发，我只给出了日期和时间以查看它是否会触发，我正在主线程中完成所有操作但它不起作用
有人能让我明白我在这里做错了什么吗

Answer 1

您可能没有先请求许可

    import SwiftUI
//struct and class should start with an uppercase
struct NotificationView: View {
    //Central location for Notification code including the delegate
    // A call to the notificationManager just like the one below has to be included in
    // application(_:willFinishLaunchingWithOptions:) or
    // application(_:didFinishLaunchingWithOptions:)
    //https://developer.apple.com/documentation/usernotifications/unusernotificationcenterdelegate
    //https://www.hackingwithswift.com/quick-start/swiftui/how-to-add-an-appdelegate-to-a-swiftui-app
    let notificationManager: NotificationManager = NotificationManager.shared
    var body: some View {
        VStack {
            VStack {
                Button("Request Permission") {
                    //Call a func here don't define it
                    notificationManager.requestAuthorization()
                }
                .frame(width: 200, height: 60, alignment: .center)
                .foregroundColor(.black)
                .background(Color.blue)
                .cornerRadius(10.0)
                .padding()

                Button("Add custom trigger") {
                    let apiDate = DateComponents(year: 2021, month: 11, day: 10, hour: 16, minute: 0, second: 0)
                    notificationManager.scheduleBasedOnDaysBeforeDate(title: "test", body: "test", baseDate: Calendar.current.date(from: apiDate)!, xDaysBefore: 10, count: 12, identifier: UUID().uuidString)
                }
                .padding()

                Button("Print Notifications") {
                    //Reusable method
                    self.notificationManager.printNotifications()
                }
                Button("Print Delivered Notifications") {
                    //Reusable method
                    self.notificationManager.printDeliveredNotifications()
                }
                .foregroundColor(.blue)
                .padding()
                Button("Delete Notifications") {
                    //Reusable method
                    self.notificationManager.deleteNotifications()
                }
                .foregroundColor(.blue)
                .padding()
            }
        }
    }
}
class NotificationManager: NSObject, UNUserNotificationCenterDelegate{
    //Singleton is requierd because of delegate
    static let shared: NotificationManager = NotificationManager()
    let notificationCenter = UNUserNotificationCenter.current()
    
    private override init(){
        super.init()
        //This assigns the delegate
        notificationCenter.delegate = self
    }
    func scheduleUNCalendarNotificationTrigger(title: String, body: String, dateComponents: DateComponents, identifier: String, repeats: Bool = false){
        print(#function)
        let content = UNMutableNotificationContent()
        content.title = title
        content.body = body
        content.sound = .default
        
        let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponents, repeats: repeats)
        let request = UNNotificationRequest(identifier: identifier, content: content, trigger: trigger)
        notificationCenter.add(request) { (error) in
            if error != nil {
                print(error!)
            }
        }
    }
    func scheduleUNTimeIntervalNotificationTrigger(title: String, body: String, timeInterval: TimeInterval, identifier: String, repeats: Bool = false){
        print(#function)
        let content = UNMutableNotificationContent()
        content.title = title
        content.body = body
        content.sound = .default

        let trigger = UNTimeIntervalNotificationTrigger(timeInterval: timeInterval, repeats: repeats)
        let request = UNNotificationRequest(identifier: identifier, content: content, trigger: trigger)
        notificationCenter.add(request) { (error) in
            if error != nil {
                print(error!)
            }
        }
    }
    ///Schedules `count` number of monthly notifications that occur `xDaysBefore` the `baseDate`
    func scheduleBasedOnDaysBeforeDate(title: String, body: String, baseDate: Date, xDaysBefore: Int, count: Int, identifier: String){
        print(#function)
        var nextBaseDate: Date = baseDate
        
        for n in 1...count{
            
            guard let triggerDate: Date = Calendar.current.date(byAdding: .day, value: -xDaysBefore, to: nextBaseDate) else{
                return
            }
            let components: DateComponents = Calendar.current.dateComponents([.month,.day, .hour,.minute,.second], from: triggerDate)
            let id = identifier.appending(" \(n)")
            scheduleUNCalendarNotificationTrigger(title: title, body: body, dateComponents: components, identifier: id)
            //OR if you want specific seconds 
            //let interval = Calendar.current.dateComponents([.second], from: Date(), to: triggerDate).second ?? 1
            
            //scheduleUNTimeIntervalNotificationTrigger(title: title, body: body, timeInterval: TimeInterval(interval), identifier: id)
            
            let next = Calendar.current.date(byAdding: .month, value: 1, to: nextBaseDate)
            
            if next != nil{
                
                nextBaseDate = next!
            }else{
                print("next == nil")
                return
            }
        }
        self.printNotifications()
        
    }
    func requestAuthorization() {
        print(#function)
        notificationCenter.requestAuthorization(options: [.alert, .badge, .sound]) { (granted, error) in
            if granted {
                print("Access Granted!")
            } else {
                print("Access Not Granted")
            }
        }
    }
    
    func deleteNotifications(){
        print(#function)
        notificationCenter.removeAllPendingNotificationRequests()
    }
    
    ///Prints to console schduled notifications
    func printNotifications(){
        print(#function)
        notificationCenter.getPendingNotificationRequests { request in
            print("UNTimeIntervalNotificationTrigger Pending Notification")
            for req in request{
                if req.trigger is UNTimeIntervalNotificationTrigger{
                    print((req.trigger as! UNTimeIntervalNotificationTrigger).nextTriggerDate()?.description ?? "invalid next trigger date")
                }
            }
            print("UNCalendarNotificationTrigger Pending Notification")
            for req in request{
                if req.trigger is UNCalendarNotificationTrigger{
                    print((req.trigger as! UNCalendarNotificationTrigger).nextTriggerDate()?.description ?? "invalid next trigger date")
                }
            }
        }
    }
    ///Prints to console delivered notifications
    func printDeliveredNotifications(){
        print(#function)
        notificationCenter.getDeliveredNotifications { request in
            for req in request{
                print(req)
            }
        }
    }
    //MARK: UNUserNotificationCenterDelegate
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        
        completionHandler(.banner)
    }
}
struct NotificationView_Previews: PreviewProvider {
    static var previews: some View {
        NotificationView()
    }
}

运行此代码。首先单击“请求权限”，然后单击“添加自定义触发器”，当您单击“打印”时，您应该会在控制台中看到您的通知