I am trying to program a function which returns all the identifiers of pending notifications, which are repeating.

func getRepeatingNotificationsIds () -> [String] {
    
    var repatingNotification:[String] = []
    UNUserNotificationCenter.current().getPendingNotificationRequests {
        (requests)  in
        for request in requests{
            if (request.trigger?.repeats == true)
            {
                repatingNotification.append(request.identifier)
            }
            
         }
    }
    
    return repatingNotification
    
}

However the repatingNotification array remains empty when returned. Is it possible to maybe call repatingNotification by reference or something?

CodePudding user response：

Rather than trying to return a value, tell your function what you want it to do after collecting the requests by sending it a completion block. As mentioned in a comment, what you have won't work because of timing.

Here's a trivial playground example that should give you the idea.

import UIKit

func getRepeatingNotificationsIds (completion: @escaping ([String])->()) {
    
    var repatingNotification:[String] = []
    UNUserNotificationCenter.current().getPendingNotificationRequests {
        (requests)  in
        for request in requests {
            if (request.trigger?.repeats == true) {
                repatingNotification.append(request.identifier)
            }
         }
        completion(repatingNotification)
    }
}

getRepeatingNotificationsIds { notifications in
    print(notifications)
}