在UIPickerView上设置日期时的本地通知？

Question

我想在用户在UIPicker上设置日期时设置本地通知。

目前我没有代码，因为我不知道从哪里开始。

Answer 1

我假设你希望用户选择时发送的通知，所以：

首先，授权在应用程序委托的通知，像这样：

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 
    } 
} 

接下来，假设你”已经创建一个datepicker并将其连接到所述代码：

@IBOutlet var datePicker: UIDatePicker! 

你的用于调度通知功能是：

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) 
} 

你可以阅读更多关于UserNotifications和通知触发器在这里：https://developer.apple.com/documentation/usernotifications