通知の設定

InfoHelperに以下のメソッドを追加します。

func setNotification(_ item:TodoItem){
    let targetDate = Calendar.current.dateComponents([.year, .month, .day, .hour, .minute],from: item.date)
    let trigger = UNCalendarNotificationTrigger(dateMatching: targetDate,repeats: false)
    let content = UNMutableNotificationContent()
    content.title = item.title
    content.sound = .default
    let request = UNNotificationRequest(identifier: item.id, content: content, trigger: trigger)
    UNUserNotificationCenter.current().add(request, withCompletionHandler: nil)
}

解説

let targetDate = Calendar.current.dateComponents([.year, .month, .day, .hour, .minute],from: item.date)
let trigger = UNCalendarNotificationTrigger(dateMatching: targetDate,repeats: false)

1行目 item.dateから年、月、時間、分のデータを取得します。
2行目取得した日時からUNCalendarNotificationTriggerインスタンスを作成します。

let content = UNMutableNotificationContent()
content.title = item.title
content.sound = .default
let request = UNNotificationRequest(identifier: item.id, content: content, trigger: trigger)

1~3行目通知の内容を管理するUNMutableNotificationContentインスタンスを作成します。
4行目 id、表示内容、時刻からUNNotificationRequestインスタンスを作成します。

UNUserNotificationCenter.current().add(request, withCompletionHandler: nil)

UNNotificationRequestインスタンスを使用して通知の予約をします。

AppDelegateの編集

import UIKit
import UserNotifications

@main
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        UNUserNotificationCenter.current().delegate = self
        UNUserNotificationCenter.current().requestAuthorization(options:[.alert,.sound,.badge]){
            (granted, error) in
            
        }
        return true
    }
    
    func userNotificationCenter(_ center: UNUserNotificationCenter,willPresent notification: UNNotification,withCompletionHandler completionHandler:@escaping (UNNotificationPresentationOptions) -> Void) {
        completionHandler([.banner,.sound])
    }

    // MARK: UISceneSession Lifecycle

    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        // Called when a new scene session is being created.
        // Use this method to select a configuration to create the new scene with.
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }

    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set) {
        // Called when the user discards a scene session.
        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
    }


}