Swift 来自 datePicker 的通知触发

Question

我想将我的 datePicker 的日期设置为本地通知 fireDate。我从 another answer at S.O.:

中找到了代码

      @IBOutlet var myDatePicker: UIDatePicker!
      @IBOutlet var mySwitch: UISwitch!

var localNotification = UILocalNotification()   // You just need one
var notificationsCounter = 0

 // put your functions now
 func datePicker()            { myDatePicker.datePickerMode = UIDatePickerMode.Time }
func notificationsOptions()  {
localNotification.timeZone = NSTimeZone.localTimeZone()
localNotification.repeatInterval = .CalendarUnitDay
UIApplication.sharedApplication().scheduleLocalNotification(localNotification)
localNotification.alertAction = "Open App"
localNotification.alertBody = "Here is the seven o'clock notification"
localNotification.soundName = UILocalNotificationDefaultSoundName
localNotification.applicationIconBadgeNumber = UIApplication.sharedApplication().applicationIconBadgeNumber + 1
//     you may add arbitrary key-value pairs to this dictionary.
//     However, the keys and values must be valid property-list types
//     if any are not, an exception is raised.
// localNotification.userInfo = [NSObject : AnyObject]?
}
  func toggleSwitch(){
if mySwitch.on{
    localNotification.fireDate = myDatePicker.date
} else {
    localNotification.fireDate = NSDate(timeIntervalSinceNow: 999999999999)          // will never be fired
}
  }
override func viewDidLoad() {
super.viewDidLoad()
datePicker()
notificationsOptions()
// Do any additional setup after loading the view, typically from a nib.
 }

但它不起作用，即使一切看起来都是正确的...问题出在哪里？？

Answer 1

看起来 fireDate 属性仅在 toggleSwitch() 方法中设置。该方法是如何实现的？我建议您将该方法的内容直接移到您的 notificationsOptions() 方法中。

顺便说一句，您可能需要为您的方法考虑稍微更有用的名称：datePicker() 和 notificationOptions() 可能会让您在以后的维护中头疼，因为它们的描述性不强。

Answer 2

这样试试：

class ViewController: UIViewController {

    @IBOutlet var datePicker: UIDatePicker!
    @IBOutlet var notificationSwitch: UISwitch!

    let localNotification = UILocalNotification()

    override func viewDidLoad() {
        super.viewDidLoad()
        setUpNotificationsOptions()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()

    }

    func setUpNotificationsOptions()  {
        datePicker.datePickerMode = .Time
        localNotification.timeZone = NSTimeZone.localTimeZone()
        localNotification.repeatInterval = .Day
        localNotification.alertAction = "Open App"
        localNotification.alertBody = "a notification"
        localNotification.soundName = UILocalNotificationDefaultSoundName
    }

    func toggleNotification() {
        if notificationSwitch.on {
            localNotification.fireDate = datePicker.date.fireDate
            UIApplication.sharedApplication().scheduleLocalNotification(localNotification)
        } else {
            localNotification.fireDate = nil
            UIApplication.sharedApplication().cancelLocalNotification(localNotification)
        }
    }
    @IBAction func toggleSwitch(sender: UISwitch) {
       toggleNotification()
    }
    @IBAction func dateChanged(sender: UIDatePicker) {
       toggleNotification()
    }
}

您将需要这些扩展：

extension NSDate {
    var minute: Int {
        return NSCalendar.currentCalendar().component(.Minute, fromDate: self)
    }
    var hour: Int {
        return NSCalendar.currentCalendar().component(.Hour, fromDate: self)
    }
    var day: Int {
        return NSCalendar.currentCalendar().component(.Day, fromDate: self)
    }
    var month: Int {
        return NSCalendar.currentCalendar().component(.Month, fromDate: self)
    }
    var year: Int {
        return NSCalendar.currentCalendar().component(.Year, fromDate: self)
    }
    var fireDate: NSDate {
        let today = NSDate()
        return NSCalendar.currentCalendar().dateWithEra(1,
            year: today.year,
            month: today.month,
            day: { hour > today.hour || (hour  == today.hour
               &&  minute > today.minute) ? today.day : today.day+1 }(),
            hour: hour,
            minute: minute,
            second: 0,
            nanosecond: 0
            )!
    }
}

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