TableViewController populates on search, but won't load initial view - ios

Question

Swift 5, iOS 12, Xcode 10
I finally implemented a search bar on my ListingsViewController and it's working really well -- but the initial data isn't populating into the table.
I realize that this is a clumsy implementation, but I'm learning as I go and I'm using only code that I can understand. I've been at this for two days -- I've tried creating a Struct and bringing in the data that way, but I can't even get an Array. I've tried bringing it in as an NSArray and an Array and an Object, but either I can't get the initial table to load, or I can't get data to parse out at all, or I can't get the search to work.
I suspect it has something to do with how, when or where I'm calling the loadData() function but I just can't figure it out.
class ListingsViewController: UITableViewController, UISearchResultsUpdating {
var tableData = [String]()
var filteredTableData = [String]()
var resultSearchController = UISearchController()
func updateSearchResults(for searchController: UISearchController) {
filteredTableData.removeAll(keepingCapacity: false)
let searchPredicate = NSPredicate(format: "SELF CONTAINS[c] %#", searchController.searchBar.text!)
let array = (tableData as NSArray).filtered(using: searchPredicate)
filteredTableData = array as! [String]
self.tableView.reloadData()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(true)
tableData = [String]()
loadData()
}
override func viewDidLoad() {
super.viewDidLoad()
tableView.reloadData()
resultSearchController = ({
let controller = UISearchController(searchResultsController: nil)
controller.searchResultsUpdater = self
controller.dimsBackgroundDuringPresentation = false
controller.searchBar.sizeToFit()
tableView.tableHeaderView = controller.searchBar
return controller
})()
tableView.reloadData()
}
func loadData() {
guard let url = URL(string: "--------------") else {return }
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
guard let dataResponse = data, error == nil else {
print(error?.localizedDescription ?? "Response Error")
return
}
do {
let jsonResponse = try JSONSerialization.jsonObject(with: dataResponse, options: [])
guard let jsonArray = jsonResponse as? [[String:Any]] else { return }
for dic in jsonArray {
self.tableData.append(dic["name"] as! String)
// self.feedItems.append(Listing(id: (dic["id"] as! String), city_id: (dic["city_id"] as! String), category: (dic["category"] as! String), sub_category: (dic["sub_category"] as! String), name: (dic["name"] as! String), phone: (dic["phone"] as! String), email: (dic["email"] as! String), website: (dic["website"] as! String), address: (dic["address"] as! String), comment: (dic["comment"] as! String), recommendedby: (dic["recommendedby"] as! String)))
}
} catch let parsingError {
print("Error", parsingError)
}
}
self.tableView.reloadData()
task.resume()
}
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if (resultSearchController.isActive) {
return filteredTableData.count
} else {
return tableData.count
}
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
cell.textLabel?.textColor = .white
cell.backgroundColor = .black
cell.tintColor = .lightText
if (resultSearchController.isActive) {
cell.textLabel?.text = filteredTableData[indexPath.row]
return cell
} else {
cell.textLabel?.text = tableData[indexPath.row]
return cell
}
}
}
I'm expecting the entire list of Listings to appear when I switch to the ListingsViewController from the tab bar. Instead, I get a blank table.
HOWEVER, If I tap into the search bar and start typing, though, I get matching results -- and when I cancel the search, I can see all of the results in the table.
(Also, when I tap into the search bar, my navigation bar goes away and doesn't come back, even when I cancel the search. Even if I switch to a different tab and come back. Haven't been able to figure that one out.)

Answer 1

You are missing the delegate and data source for the table view
add this:
class ListingsViewController: UITableViewController, UISearchResultsUpdating,UITableViewDelegate,UITableViewDataSource {
//your class code here
}
and on your viewDidLoad add this:
self.tableView.delegate = self
self.tableView.dataSource = self
that should work, Please notice that after you called the delegate and data source your cell for row and numbers of rows functions will be called so make sure the array you are using is not nil by then

Answer 2

I saw you haven't been missing delegate and data source for the table view.
You must register delegate and data source for viewcontroler. where you will display data.
Please insert this code on your viewDidLoad
self.tableView.delegate = self
self.tableView.dataSource = self

Answer 3

Change your load day to this
func loadData() {
guard let url = URL(string: "--------------") else’s {return }
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
guard let dataResponse = data, error == nil else {
print(error?.localizedDescription ?? "Response Error")
return
}
do {
let jsonResponse = try JSONSerialization.jsonObject(with: dataResponse, options: [])
guard let jsonArray = jsonResponse as? [[String:Any]] else { return }
for dic in jsonArray {
self.tableData.append(dic[“name”] as! String
}
DispatchQueue.main.async {
print("call to reload data")
self.tableView.reloadData()
}
} catch let parsingError {
print("Error", parsingError)
}
}
task.resume()
}
your are callig to reload data before the completion block, you can check it with the following print("calling to reloadData") then test my solution and see that works, make a print statamente for JsonArray to check where is called, you must reload the tableViewData after the async func is terminated.