Delete, add and display data swift table view controller - swift

Question

Im my Swift app, I need to display data in a tableview. The data at server side changes often, and therefore I need to delete any previous data and add the new data fetched. I am able to delete and fetch and I can see the new data in the console as well as realm browser. However, the data is not available in the table view controller from Results.
class ServiceProvidersTableViewController: UITableViewController {
// MARK: - Data Source
var serviceSubCategory: String = ""
var serviceSubCategories: Results<ServiceSubCategory>?
// MARK: - Realm
let realm = try! Realm()
let fetchData = FetchData()
override func viewDidLoad() {
super.viewDidLoad()
self.deleteSubCategories()
FetchData.get(ServiceSubCategory.self, params: ["subCategoryId": serviceSubCategory], success: {
self.infoAlert("Service Categories", message: "Fetch Successful")
}) {
self.infoAlert("Failed", message: "Fetch Failed")
}
self.fetchSubCategories()
}
func deleteSubCategories()
{
let subCategories = realm.objects(ServiceSubCategory.self)
print("Before delete \(subCategories)")
try! realm.write{
realm.delete(subCategories)
}
print("After delete \(subCategories)")
}
func fetchSubCategories() {
self.realm.refresh()
self.serviceSubCategories = self.realm.objects(ServiceSubCategory)
tableView.reloadData()
print("After fetch \(self.serviceSubCategories)")
}
struct Storyboard {
static let CellIndentifier = "ServiceProvidersCell"
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
print(self.serviceSubCategories!.count)
return self.serviceSubCategories!.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier(Storyboard.CellIndentifier, forIndexPath: indexPath) as! ServiceProvidersTableViewCell
print(serviceSubCategories)
cell.serviceSubCategories = self.serviceSubCategories![indexPath.row]
return cell
}
func infoAlert(title:String,message:String) -> Void {
let actionSheetController: UIAlertController = UIAlertController(title:title, message:message, preferredStyle: .Alert)
let cancelAction: UIAlertAction = UIAlertAction(title: "Cancel", style: .Cancel) { action -> Void in }
actionSheetController.addAction(cancelAction)
self.presentViewController(actionSheetController, animated: true, completion: nil)
}
}

Answer 1

My guess is that you need to delete the object from the local "serviceSubCategory" and not just from the server.
Put a tableView.reloadData() everytime the server listener fires.
Probably in the fetchSubCategories() and deleteSubCategories() functions.

Answer 2

I solved (I should say, I am dumb) as follows:-
The FetchData method has a callback success, which in the example I used displays an alert.
I created another function in the tableViewController and called this in the success call back. Inside the new method I called self.tableView.reloadData().
Thanks to all for helping me out