swift - UNTimeIntervalNotificationTrigger nextTriggerDate() 是否给出了错误的日期？

Question

我正在更新我的 localnotifications 以使用 iOS 10，但我遇到了一个问题，我认为 nextTrigger 函数返回的不是“满足触发条件的下一个日期。”而是返回当前日期时间加上您最初将 UNTimeInvervalNotificationTrigger 设置为的时间。

因此，如果您将触发器设置为在 60 秒后关闭，根据文档，我希望当我调用 nextTriggerDate() 时，我会返回设置触发器 + 60 秒时的任何日期时间.因此，如果我将其设置为 12:00:00，我预计 nextTriggerDate() 将是 12:01:00。然而，我遇到的是它返回当前日期 + 60 秒的任何值。

我编写了一个示例来安排 UNTimeIntervalNotificationTrigger，然后每秒打印出 nextTriggerDate()。当我运行它时，我每秒都会得到一个新的 nextTriggerDate。像这样:

            //Optional(2016-11-03 21:26:31 +0000)
            //Optional(2016-11-03 21:26:32 +0000)
            //Optional(2016-11-03 21:26:33 +0000)
            //Optional(2016-11-03 21:26:34 +0000)
            //Optional(2016-11-03 21:26:35 +0000)
            //Optional(2016-11-03 21:26:36 +0000)

我用 apple 打开了一个 TSI，但是……你知道……这需要一段时间。所以我想我会看看这里是否有人有任何见解。我怀疑这是一个错误，如果我得到更多信息，我会更新它。

这是我用来说明问题的代码:

import UIKit
import UserNotifications

class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
    @IBOutlet weak var setButton: UIButton!

    @IBOutlet weak var timePicker: UIPickerView!

    weak var timer: Timer?

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

    @IBAction func setButtonAction(_ sender: UIButton) {
        var mySecond = pickerSelection

        // build notification
        let content = UNMutableNotificationContent()
        content.title = "Title of notification"
        content.body = "This is the body of the notification"
        content.sound = UNNotificationSound.default()
        content.categoryIdentifier = "myCategory"

        let trigger = UNTimeIntervalNotificationTrigger(timeInterval: Double(mySecond), repeats: false)

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

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

        self.timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(self.tick), userInfo: nil, repeats: true)
    }

    let pickerData = [":00",":01",":02",":03",":04",":05",":06",":07",":08",":09",":10",":11",":12",":13",":14",":15",":16",":17",":18",":19",":20",":21",":22",":23",":24",":25",":26",":27",":28",":29",":30",":31",":32",":33",":34",":35",":36",":37",":38",":39",":40",":41",":42",":43",":44",":45",":46",":47",":48",":49",":50",":51",":52",":53",":54",":55",":56",":57",":58",":59"]


    var pickerSelection = 0


    override func viewDidLoad() {
        super.viewDidLoad()
        self.timePicker.dataSource = self
        self.timePicker.delegate = self
        self.timePicker.selectRow(pickerSelection, inComponent: 0, animated: false)
    }

    // The number of columns of data
    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }

    // The number of rows of data
    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return pickerData.count
    }

    // The data to return for the row and component (column) that's being passed in
    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return pickerData[row]
    }

    func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
        let pickerLabel = UILabel()
        let titleData = pickerData[row]
        let myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Futura", size: 44.0)!])
        pickerLabel.attributedText = myTitle
        pickerLabel.textAlignment = .center

        return pickerLabel
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        pickerSelection = row
    }

    func tick() {
        let center = UNUserNotificationCenter.current()
        center.getPendingNotificationRequests(completionHandler: { (scheduledLocalNotifications) in
            for localNotice in scheduledLocalNotifications {
                var localTrigger = localNotice.trigger as! UNTimeIntervalNotificationTrigger

                var localTime = localTrigger.nextTriggerDate()
                // ** This output shows something like this:

                //Optional(2016-11-03 21:26:31 +0000)
                //Optional(2016-11-03 21:26:32 +0000)
                //Optional(2016-11-03 21:26:33 +0000)
                //Optional(2016-11-03 21:26:34 +0000)
                //Optional(2016-11-03 21:26:35 +0000)
                //Optional(2016-11-03 21:26:36 +0000)
                print("\(localTime)")     
            }
        })
    }
}

Answer 1

收到 Apple DTS 的回复，并被告知我所描述的功能是它设计的工作原理。尽管我认为文档的解释有所不同，但他们告诉我“考虑到实现，文档是乐观的”。不管怎样，我通过在我的代码中跟踪触发日期来解决这个问题。我希望这个答案可以帮助遇到与我相同问题的其他人。