Swift tableView.reloadData() is not working - ios

Question

Solution : https://stackoverflow.com/a/39638032/1106035
I am new to Swift, I need to reload my records when I click on the UIButton action. For me reload method is stop working. I tried in all the possible ways as following:
Here is the function that I call when I tap the button
#IBAction func refresh(sender: AnyObject) {
// I tried this one but doesn't works
dispatch_async(dispatch_get_main_queue()) {
self.tblNotes.reloadData()
}
// This one too doesn't works for me
self.tblNotes.reloadData()
//Neither this
dispatch_async(dispatch_get_main_queue(), { () -> Void in
self.tblNotes.reloadData()
})
}
Below one is my entire Class
class ListaTrmTableViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UISearchBarDelegate , UISearchDisplayDelegate, EditNoteViewControllerDelegate {
#IBOutlet weak var searchBar: UISearchBar!
#IBOutlet var tblNotes: UITableView!
var arrNotes: Array<CKRecord> = []
var editedNoteRecord: CKRecord!
var selectedNoteIndex: Int!
var searchActive : Bool = false
var filtered:Array<CKRecord> = []
var notesArray = [ListaTrmTableViewController]()
override func viewDidLoad() {
super.viewDidLoad()
tblNotes.delegate = self
tblNotes.dataSource = self
searchBar.delegate = self
fetchNotes()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// Return the number of sections.
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// Return the number of rows in the section.
if(searchActive) {
return filtered.count
}
return arrNotes.count
}
//Cell height size
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return 50.0
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
selectedNoteIndex = indexPath.row
performSegueWithIdentifier("viewControllerSg", sender: self)
}
//Segue to other ViewController
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "viewControllerSg" {
let editNoteViewController = segue.destinationViewController as! ViewController
if let index = selectedNoteIndex {
editNoteViewController.editedNoteRecord = arrNotes[index]
}
if(searchActive){
editNoteViewController.editedNoteRecord = filtered[selectedNoteIndex]
}
}
}
// Retrive data from CloudKit
func fetchNotes() {
let container = CKContainer.defaultContainer()
let privateDatabase = container.publicCloudDatabase
let predicate = NSPredicate(value: true)
let query = CKQuery(recordType: "Notes", predicate: predicate)
query.sortDescriptors = [NSSortDescriptor(key: "Title", ascending: true)]
privateDatabase.performQuery(query, inZoneWithID: nil) { (results, error) -> Void in
if error != nil {
println(error)
}
else {
println(results)
for result in results {
self.arrNotes.append(result as! CKRecord)
}
NSOperationQueue.mainQueue().addOperationWithBlock({ () -> Void in
self.tblNotes.reloadData()
self.tblNotes.hidden = false
})
}
}
}
func didSaveNote(noteRecord: CKRecord, wasEditingNote: Bool) {
if !wasEditingNote {
arrNotes.append(noteRecord)
}
else {
arrNotes.insert(noteRecord, atIndex: selectedNoteIndex)
arrNotes.removeAtIndex(selectedNoteIndex + 1)
selectedNoteIndex = nil
}
if tblNotes.hidden {
tblNotes.hidden = false
}
tblNotes.reloadData()
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("idCellNote", forIndexPath: indexPath) as! UITableViewCell
if(searchActive){
let noteRecord: CKRecord = filtered[indexPath.row]
cell.textLabel?.text = noteRecord.valueForKey("Atitulo") as? String
} else {
let noteRecord: CKRecord = arrNotes[indexPath.row]
cell.textLabel?.text = noteRecord.valueForKey("Atitulo") as? String
}
return cell
}
// Search functions
func searchBarTextDidBeginEditing(searchBar: UISearchBar) {
searchActive = true;
}
func searchBarTextDidEndEditing(searchBar: UISearchBar) {
searchActive = false;
}
func searchBarCancelButtonClicked(searchBar: UISearchBar) {
searchActive = false;
}
func searchBarSearchButtonClicked(searchBar: UISearchBar) {
searchActive = false;
}
func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {
filtered = arrNotes.filter ({ (note) -> Bool in
let titles = note.objectForKey("Atitulo") as? String
//proceed as per normal
let range = titles!.rangeOfString(searchText, options: NSStringCompareOptions.CaseInsensitiveSearch)
// I returned false to isolated the problem
if let range = range { return true} else { return false}
})
if(filtered.count == 0){
searchActive = false;
} else {
searchActive = true;
}
self.tblNotes.reloadData()
}
// The big problem is here
#IBAction func refresh(sender: AnyObject) {
// I tried this one but don't works
dispatch_async(dispatch_get_main_queue()) {
self.tblNotes.reloadData()
}
// This one don't works too
self.tblNotes.reloadData()
//Neither this
dispatch_async(dispatch_get_main_queue(), { () -> Void in
self.tblNotes.reloadData()
})
}

Answer 1

First, you need to make sure that you have set the delegate and datasource from Storyboard where your TableView exists.
Second, I think you are trying to reload data that if you don't get successfully from cloudkit because of network problem. So,tableView.reloadData() wont bring you anything until you fetch data from cloud. So, try to insert fetchNotes() inside main thread so your view will refresh.
#IBAction func refresh(sender: AnyObject) {
dispatch_async(dispatch_get_main_queue()) {
self.fetchNotes()
}
}

Answer 2

You need to make sure the View Controller is the delegate and data source for the UITable. This can be done through the Storyboard.