Question

我有问题。我的项目中有本地通知，这里是代码（感谢@leoDabus）：

import UIKit

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()

}
override func viewDidAppear(animated: Bool) {
    guard let loadedDate = NSUserDefaults().dateForKey("datePicker") else { return }
    datePicker.setDate(loadedDate, animated: false)
}
func setUpNotificationsOptions()  {
    datePicker.datePickerMode = .Time
    localNotification.timeZone = NSTimeZone.localTimeZone()
    localNotification.repeatInterval = .Day
    localNotification.alertAction = "Open App"
    localNotification.alertBody = news[0].titleNews
    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) {
   NSUserDefaults().setDate(sender.date, forKey: "datePicker")

   toggleNotification()
      } }


            extension NSUserDefaults {
   func setDate(date: NSDate, forKey:String) {
    NSUserDefaults().setObject(date, forKey: forKey)
}
func dateForKey(string:String) -> NSDate? {
    return NSUserDefaults().objectForKey(string) as? NSDate
}}

问题是我的本地通知警报Body news [0] .titleNews是解析器的结果，它是一个定期更改的值。但是使用上面的代码我每天都获得相同的字符串，而不是更新的字符串。有一种方法可以每天更新新闻吗？我可以通过编程方式取消上次预定通知并安排新通知吗？

Answer 1

在null userInfo属性中设置唯一ID，当您获得更新状态/新闻时，遍历所有预定通知，使用您之前设置的ID获取通知，现在执行你的工作相应。

设置您的ID，如下所示

UILocalNotification

遍历预定通知的代码

localNotification.userInfo = ["notificationID" : "Your Id"]

取消本地通知并安排新通知

1 个答案: