swift show loader while reading data from firebase

Question

i have a list of music at my firebase real time database and i am retriving them but i have 1000 musics data and i want to show loader when i reading data and stop loader when if there is a error(internet connection, or something else) or reading completed.

when i turn off the internet i couldn't get the data and can't stop loader to show error alert like there is no internet connection.

please help me how to handle that problem.

here is my code

didload function called from viewdidload()

   private var musicArray = [ItemModal]() {
        didSet {
            view?.updateTableView()
        }
    }

  func didLoad() {
        view?.showLoader()
        getAllMusics { ItemModal in
            self.musicArray = ItemModal
            self.view?.hideLoader()
        }
    }

   func getAllMusics(completion: @escaping ([ItemModal]) -> Void) {
        var musicArray = [ItemModal]()
 
        ref.child("music").observeSingleEvent(of: .value) { snapshot in
            let enumerator = snapshot.children
            while let rest = enumerator.nextObject() as? DataSnapshot {
                guard let data = try? JSONSerialization.data(withJSONObject: rest.value as Any, options: []) else { return }
                if let itemModal = try? JSONDecoder().decode(ItemModal.self, from: data) {
                    musicArray.append(itemModal)
                }
            }
           completion(musicArray)
        }
    }

Answer 1

You can use reachability function by using https://github.com/ashleymills/Reachability.swift. To get to notify when the internet is turned off, you can implement reachabilityChanged Notification. In the selector method of reachabilityChanged, you can hide the loader.

override func viewDidLoad() {
    super.viewDidLoad()
    NotificationCenter.default.addObserver(self, selector: #selector(reachabilityChanged), name: .reachabilityChanged)
}

@objc func changed() {
    if reachability?.isReachable {
        //Continue success implementation
    } else {
        view?.hideLoder
        //Implement Error handling
    }
}