Cancel a local notification and schedule a new one - ios

Question

I have a problem. I have local notifications in my project, here is the code (thanks #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
}}
the problem is that my local notification alert Body news[0].titleNews is the result of a parser and it's a value that changes periodically. But with the code above i obtain every day the same string, not the updated one. There is a method to have everyday the updated news? Can I cancel last scheduled notification programmatically and scheduling new one?

Answer 1

Set a unique id in the userInfo property of UILocalNotification and when you get the updated status/news, traverse throught all the scheduled notifications , get your notification with that id you set earlier and now do your work accordingly.
Set your id like the following
localNotification.userInfo = ["notificationID" : "Your Id"]
Code for traversing scheduled notifications
let notificationArr:NSArray? = UIApplication.sharedApplication().scheduledLocalNotifications
notificationArr!.enumerateObjectsUsingBlock({ object, index, stop in
let notification = object as! UILocalNotification;
let userInfo = notification.userInfo! as NSDictionary
let notificationID = userInfo["notificationID"] as! String
if(notificationID == "Your set Id"){
UIApplication.sharedApplication().cancelLocalNotification(notification);
}
})