ios - 为什么我在使用 prepareForSegue 传递值时出错？

Question

我正在尝试使用 prepareForSegue 将 datePicker 的值从一个 VC 发送到另一个是我发送类的代码:

var dateSender: Date!

@IBAction func sendDate(_ sender: UIDatePicker) {

    dateSender=datePicker.date

}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    var DateViewController: Viola=segue.destination as! Viola

    DateViewController.HereDate=dateSender

}

接收类代码:

var HereDate: Date?
weak var reminder: Reminder?

@IBAction func `switch2`(_ sender: BEMCheckBox) {

        let name = "hello"
        var time1 = HereDate
        let timeInterval = floor((time1?.timeIntervalSinceReferenceDate)!/60)*60
        time1 = Date(timeIntervalSinceReferenceDate: timeInterval)
        let notification = UILocalNotification()
        notification.alertTitle = "Reminder"
        notification.alertBody = "You need to \(name)!"
        notification.fireDate = HereDate
        notification.soundName = UILocalNotificationDefaultSoundName

        UIApplication.shared.scheduleLocalNotification(notification)

        reminder = Reminder(name: name, time: time1!, notification: notification)

    }

Answer 1

我制作了一个演示项目来演示如何使用 segue 传递日期。克隆我的项目:

https://github.com/Hapeki/Example1

注意 Storyboard中的 segue 标识符。