如何在SwiftUI中實現本地通知

要在SwiftUI中實現本地通知，可以使用UserNotifications框架。首先，需要在AppDelegate.swift文件中請求用戶授權發送通知：

import UserNotifications

class AppDelegate: NSObject, UIApplicationDelegate, UNUserNotificationCenterDelegate {

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        
        UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge, .sound]) { granted, error in
            if granted {
                print("User has granted permission for notifications")
            } else {
                print("User has denied permission for notifications")
            }
        }
        
        UNUserNotificationCenter.current().delegate = self

        return true
    }
}

然后，在需要發送通知的地方，可以使用以下代碼來創建和發送通知：

import UserNotifications

let content = UNMutableNotificationContent()
content.title = "Reminder"
content.body = "Don't forget to do your tasks!"
let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 5, repeats: false)
let request = UNNotificationRequest(identifier: "reminderNotification", content: content, trigger: trigger)

UNUserNotificationCenter.current().add(request) { error in
    if let error = error {
        print("Error adding notification: \(error)")
    }
}

確保在發送通知之前，在Info.plist文件中添加以下權限：

• Privacy - Notifications Usage Description
• Required background modes: App downloads content from the network

這樣就可以在SwiftUI中實現本地通知了。