ios - 如何在 Swift 的日期选择器上设置本地通知时间

Question

import UIKit
import UserNotifications


class ViewController: UIViewController {

    @IBOutlet weak var myDatePicker1: UIDatePicker!
    @IBAction func action(_ sender: Any) {
        let content = UNMutableNotificationContent()
        content.title = "This is a notification"
        content.subtitle = "I hope this works"
        content.body = "from the tutorial"
        content.badge = 1

        let componentsFromDate = Calendar.current.dateComponents(in: TimeZone.current, from: myDatePicker1.date)

        let trigger = UNTimeIntervalNotificationTrigger(timeInterval: componentsFromDate, repeats: true)

        let request = UNNotificationRequest(identifier: "timeDone", content: content, trigger: trigger)
        UNUserNotificationCenter.current().add(request, withCompletionHandler: nil)

    }


    override func viewDidLoad() {
        super.viewDidLoad()
         UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge], completionHandler: {didAllow, error in})
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

以下是我打印请求和触发器时控制台中显示的内容:

<UNNotificationRequest: 0x6000002335e0; identifier: timeDone, content:
 <UNNotificationContent: 0x600000113ef0; title: This is a notification,
 subtitle: I hope this works, body: from the tutorial,
 categoryIdentifier: , launchImageName: , peopleIdentifiers: ( ),
 threadIdentifier: , attachments: ( ), badge: 1, sound: (null),
 hasDefaultAction: YES, defaultActionTitle: (null),
 shouldAddToNotificationsList: YES,
 shouldAlwaysAlertWhileAppIsForeground: NO, shouldLockDevice: NO,
 shouldPauseMedia: NO, isSnoozeable: NO, fromSnooze: NO,
 darwinNotificationName: (null), darwinSnoozedNotificationName: (null),
 trigger: <UNCalendarNotificationTrigger: 0x600000233540;
 dateComponents: <NSDateComponents: 0x6000003461a0>
     Calendar: <CFCalendar 0x60000009c7a0 [0x10c9fee40]>{identifier = 'gregorian'}
     TimeZone: America/Vancouver (PDT) offset -25200 (Daylight)
     Era: 1
     Calendar Year: 2017
     Month: 8
     Leap month: no
     Day: 11
     Hour: 9
     Minute: 58
     Second: 39
     Nanosecond: 0
     Quarter: 0
     Year for Week of Year: 2017
     Week of Year: 32
     Week of Month: 2
     Weekday: 6
     Weekday Ordinal: 2, repeats: YES>>

我是使用 Swift 进行应用程序开发的新手，我正在尝试创建一个简单的应用程序，当用户在日期选择器上进行选择时，该应用程序会向用户发送本地通知。由于某种原因，UNCalenderNotificationTrigger 将仅采用 DateComponents() 并且 DateComponents() 必须是 Int，而不是 Date 类型()(来自日期选择器)。有人可以帮我吗？谢谢

Answer 1

您可以使用 Calendar 使用

从 Date 对象获取 DateComponents

let componentsFromDate = Calendar.current.dateComponents(in: TimeZone.current, from: Date())

如果将 Date() 替换为 DatePicker 中的 Date 对象，则可以使用 componentsFromDate创建UNCalendarNotificationTrigger。