在UIPickerView上設置日期時的本地通知？

Question

我想在用戶在UIPicker上設置日期時設置本地通知。

目前我沒有代碼，因爲我不知道從哪裏開始。

Answer 1

我假設你希望用戶選擇時發送的通知，所以：

首先，授權在應用程序委託的通知，像這樣：

import UserNotifications 

class AppDelegate { 
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { 
     // Override point for customization after application launch. 
     let center = UNUserNotificationCenter.current() 
     center.requestAuthorization(options: [.alert, .sound, .badge]) { (granted, error) in 
      // Enable or disable features based on authorization 
     } 
     return true 
    } 
} 

接下來，假設你」已經創建一個datepicker並將其連接到所述代碼：

@IBOutlet var datePicker: UIDatePicker! 

你的用於調度通知功能是：

func scheduleNotification() { 
    let content = UNMutableNotificationContent() //The notification's content 
    content.title = "Hi there" 
    content.sound = UNNotificationSound.default() 

    let dateComponent = datePicker.calendar.dateComponents([.day, .hour, .minute], from: datePicker.date) 
    let trigger = UNCalendarNotificationTrigger(dateMatching: dateComponent, repeats: false) 

    let notificationReq = UNNotificationRequest(identifier: "identifier", content: content, trigger: trigger) 

    UNUserNotificationCenter.current().add(notificationReq, withCompletionHandler: nil) 
} 

你可以閱讀更多關於UserNotifications和通知觸發器在這裏：https://developer.apple.com/documentation/usernotifications