I have a tableview in my view controller and i am trying to implement the pull to refresh function. When i pull to refresh the table view does not reload and the data is not updated.
When i print the array print(tempRefresh) inside of my fetchRefresh function, it returns an empty array??
my firebase database looks like this.
override func viewDidLoad() {
super.viewDidLoad()
// refresh the page
refreshControl = UIRefreshControl()
if #available(iOS 10.0, *) {
tableView.refreshControl = refreshControl
} else {
// fallback on older versions
tableView.addSubview(refreshControl)
}
refreshControl.attributedTitle = NSAttributedString(string: "Loading...")
refreshControl.addTarget(self, action: #selector(handleRefresh), for: .valueChanged)
// reload the tabelview
tableView.reloadData()
tableView.delegate = self
tableView.dataSource = self
}
@objc func handleRefresh() {
print("refresh")
beginRefresh()
DispatchQueue.main.async {
self.refreshControl.endRefreshing()
}
}
func fetchRefresh(completion: @escaping(_ comments:[Comments])->()) {
oldCommentsQuery.queryLimited(toLast: 20).observeSingleEvent(of: .value, with: { snapshot in
var tempRefresh = [Comments]()
let commentsSnap = snapshot.childSnapshot(forPath: "comments")
let allComments = commentsSnap.children.allObjects as! [DataSnapshot]
for commentSnap in allComments {
let degree = commentSnap.childSnapshot(forPath: "reply degree").value as? String ?? ""
let name = commentSnap.childSnapshot(forPath: "reply name").value as? String ?? ""
let text = commentSnap.childSnapshot(forPath: "reply text").value as? String ?? ""
let university = commentSnap.childSnapshot(forPath: "reply university").value as? String ?? ""
let photoURL = commentSnap.childSnapshot(forPath: "reply url").value as? String ?? ""
let url = URL(string: photoURL)
let timestamp = commentSnap.childSnapshot(forPath: "timestamp").value as? Double
let lastComment = self.comments.last
if snapshot.key != lastComment?.id {
let newRefresh = Comments(id: snapshot.key, fullname: name, commentText: text, university: university, degree: degree, photoURL: photoURL, url: url!, timestamp: timestamp!)
tempRefresh.insert(newRefresh, at: 0)
//test
print(tempRefresh)
}
}
return completion(tempRefresh)
})
}
func beginRefresh() {
fetchingMore = true
// fetch the comments
fetchRefresh { newComments in
self.comments.append(contentsOf: newComments)
self.endReached = newComments.count == 0
self.fetchingMore = false
self.tableView.reloadData()
}
}