UICollectionView does not refresh in swift 3 - uitableview

Question

I add UICollectionView in my app and each cell has "Delete" trash button.
When I click on this button, it will show alert message to ask. After clicks on OK button, the item in Collection View will delete. However, the UI does not refresh , the item was not deleted.
My Code is ...
override func viewDidLoad() {
super.viewDidLoad()
myCollectionView.reloadData()
}
override func viewDidAppear(_ animated: Bool) {
debugPrint("viewDidAppear")
callWatchLater()
}
override func viewWillAppear(_ animated: Bool) {
DispatchQueue.main.async(execute: {
debugPrint("Appear")
self.myCollectionView.reloadData()
})
}
override func viewDidLayoutSubviews() {
DispatchQueue.main.async(execute: {
debugPrint("SubViews")
self.myCollectionView.reloadData()
})
}
Code for Alert Controller is
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "watchCell", for: indexPath) as! WatchLaterTableCell
let watchTableList = self.watchLaterTable[indexPath.row]
cell.deleteMovie.addTarget(self, action:#selector(showAlert(sender:)), for: .touchUpInside)
}
return cell
}
func showAlert(sender:UIButton!)
{
debugPrint("Press Button")
let alert = UIAlertController(title: "Are you really want to delete this movie?", message: "", preferredStyle: UIAlertControllerStyle.alert)
// Create the actions
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default) {
UIAlertAction in
self.callRest()
debugPrint("Press OK")
}
let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.cancel) {
UIAlertAction in
_ = self.navigationController?.popViewController(animated: true)
}
// Add the actions
alert.addAction(okAction)
alert.addAction(cancelAction)
// Present the controller
DispatchQueue.main.async(execute: {
self.present(alert, animated: true, completion: nil)
})
}
Code For callRest() is
func callRest(){
SwiftLoading().showLoading()
if Reachability().isInternetAvailable() == true {
rest.auth(auth: access_token)
rest.delete(StringResource().mainURL + "user/" + user_id + "/watch/later/" + String(vedioId) , parma: [:], finished: {(result: NSDictionary, status : Int) -> Void in
debugPrint(result)
if(status == 200){
let data = result["data"] as! NSString
self.messages = String(describing: data)
DispatchQueue.main.sync{[unowned self] in
let alertController = UIAlertController(title: "", message: self.messages , preferredStyle: .alert)
// Create the actions
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default) {
UIAlertAction in
debugPrint("call rest Press OK")
self.callWatchLaterGetAPI()
}
alertController.addAction(okAction)
// Present the controller
DispatchQueue.main.async(execute: {
self.present(alertController, animated: true, completion: nil)
})
}
self.myCollectionView.reloadData()
SwiftLoading().hideLoading()
}else{
let error = result["error"] as! NSArray
for item in 0...(error.count) - 1 {
let device : AnyObject = error[item] as AnyObject
self.messages = device["message"] as! String
DispatchQueue.main.sync{[unowned self] in
let alertController = UIAlertController(title: "", message: self.messages , preferredStyle: .alert)
// Create the actions
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default) {
UIAlertAction in
debugPrint("Press OK")
}
alertController.addAction(okAction)
// Present the controller
DispatchQueue.main.async(execute: {
self.present(alertController, animated: true, completion: nil)
})
}
SwiftLoading().hideLoading()
}
}
})
}else{
noInternetConnection()
}
}
However, the CollectionView does not refresh . Can anyone help me this, please?