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我是本地通知的新手，我必须执行一项任务。我有一个提醒日期和文本，所以我想根据提醒日期和当前日期显示本地通知。

  1. 如果提醒日期是当前日期前 7 天，那么我必须显示通知
  2. 如果提醒日期是当前日期前 2 天，那么我必须显示提醒。
  3. 在同一天晚上 5 点，我必须显示提醒文本。

我的示例代码是：

import UIKit
import EventKit
import UserNotifications

class ViewController: UIViewController, UNUserNotificationCenterDelegate {
override func viewDidLoad() {
    super.viewDidLoad()
    //getNotificationSettings()
    UNUserNotificationCenter.current().delegate = self
}

//Button Alarm
@IBAction func btnAlarm(_ sender: Any) {

    let date = Date()

    /*let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss ZZZ"

    dateFormatter.timeZone = TimeZone.current
    let dateString = dateFormatter.string(from: date)
    let originalDate = dateFormatter.date(from: dateString)

    //let dateInFormat = dateFormatter.stringFromDate(Date())*/

    scheduleNotification(at: date!)
}

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

    if response.actionIdentifier == "answer1" {
        print("Answer 1")
    }

    else if response.actionIdentifier == "textNotification" {
        print("Answer Text Notification")
    }

    completionHandler()
}


//Schedule Notification
func scheduleNotification(at date: Date) {
    let calendar = Calendar(identifier: .gregorian)
    let components = calendar.dateComponents(in: .current, from: date)
    let newComponents = DateComponents(calendar: calendar, timeZone: .current, month: components.month, day: components.day, hour: components.hour, minute: components.minute)

    let trigger = UNCalendarNotificationTrigger(dateMatching: newComponents, repeats: false)

    let content = UNMutableNotificationContent()
    content.title = "Tutorial Reminder"
    content.body = "Just a reminder to read your tutorial over at appcoda.com!"
    content.sound = UNNotificationSound.default()
    content.categoryIdentifier = "myCategory"

    if let path = Bundle.main.path(forResource: "logo", ofType: "png") {
        let url = URL(fileURLWithPath: path)

        do {
            let attachment = try UNNotificationAttachment(identifier: "logo", url: url, options: nil)
            content.attachments = [attachment]
        } catch {
            print("The attachment was not loaded.")
        }
    }

    let request = UNNotificationRequest(identifier: "textNotification", content: content, trigger: trigger)

    UNUserNotificationCenter.current().delegate = self
    UNUserNotificationCenter.current().removeAllPendingNotificationRequests()
    UNUserNotificationCenter.current().add(request) {(error) in
        if let error = error {
            print("Uh oh! We had an error: \(error)")
        }
    }
  }
}

我已经检查了 Appdelegate.swift 文件中的权限：- 

import UIKit
import CoreData
import UserNotifications

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?


func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
     //getNotificationSettings()
    registerForPushNotifications()
    return true
}

func applicationWillResignActive(_ application: UIApplication) {
    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
    // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
}

func applicationDidEnterBackground(_ application: UIApplication) {
    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}

func applicationWillEnterForeground(_ application: UIApplication) {
    // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
}

func applicationDidBecomeActive(_ application: UIApplication) {
    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}

func applicationWillTerminate(_ application: UIApplication) {
    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
    // Saves changes in the application's managed object context before the application terminates.
    //self.saveContext()
}

/*func registerForPushNotifications() {
    UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) {
        (granted, error) in
        print("Permission granted: \(granted)")
    }
}*/

/*func getNotificationSettings() {
    let notificationSettings = UIUserNotificationSettings(types: [.alert, .sound], categories: nil)

    UIApplication.shared.registerUserNotificationSettings(notificationSettings)
}*/

func registerForPushNotifications() {
    UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound]) {
        (granted, error) in
        print("Permission granted: \(granted)")
    }
}

我怎样才能完成上述任务，为什么在我的代码中没有显示当前日期的本地通知是当地时间或其他任何时间？

4

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