RemoteNotificationDeepLink

//Class for handling DeepLink in Swift 3.

class RemoteNotificationDeepLink: NSObject {
    var article: String = ""

    class func create(_ userInfo: [AnyHashable: Any]) -> RemoteNotificationDeepLink? {
        let info = userInfo as NSDictionary
        guard let articleID = info.object(forKey: "app") as? String else {
            return nil
        }

        var ret: RemoteNotificationDeepLink? = nil
        if !articleID.isEmpty {
            ret = RemoteNotificationDeepLinkArticle(articleStr: articleID)
        }
        return ret
    }

    fileprivate override init() {
        self.article = ""
        super.init()
    }

    fileprivate init(articleStr: String) {
        self.article = articleStr
        super.init()
    }

    final func trigger() {
        DispatchQueue.main.async {
            self.triggerImp() { _ in
                // do nothing
            }
        }
    }

    fileprivate func triggerImp(_ completion: ((AnyObject?) -> (Void))) {
        completion(nil)
    }
}

class RemoteNotificationDeepLinkArticle: RemoteNotificationDeepLink {
    var articleID: String!

    override init(articleStr: String) {
        self.articleID = articleStr
        super.init(articleStr: articleStr)
    }

    fileprivate override func triggerImp(_ completion: ((AnyObject?) -> (Void))) {
        super.triggerImp() { _ in
            if let strID = self.articleID, let id = Int(strID) {
                //handle id
            }
            completion(nil)
        }
    }
}