I tried using a simple Strings to start to see if that would work on an array that I entered manually. That seemed to work fine. Now, if I try to use a filter on an array. I'm unable to have the tableView reflect the search terms accordingly. I have a feeling it's the way that the data is being saved but I'm unsure and how to diagnose the issue. import UIKit

class SearchViewController_TableView: UIViewController, UITableViewDataSource, UITableViewDelegate, UISearchBarDelegate { var data: [String] = [] //store name items here var dataEntered: [ToDoItem] = [] var filteredData: [String] = [] var barController = UISearchBar() var searching = false

@IBOutlet weak var tableVw: UITableView!
@IBOutlet weak var searchBar: UISearchBar!

// Filter does not update properly i.e. data that is filtered is not used to update table.
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    if searching == true {
        return filteredData.count
    } else {
        print("searchBar: Number of rows in dataEntered: \(dataEntered.count)")
        return dataEntered.count
    }
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "searchCell", for: indexPath)
    print("Contents of data:\(data)")
    //let selectedIndexPath = tableVw.indexPathForSelectedRow!
    if searching == true {
        cell.textLabel?.text = filteredData[indexPath.row]
    } else {
        cell.textLabel?.text = dataEntered[indexPath.row].name
    }

    return cell
}
override func viewDidLoad() {
    super.viewDidLoad()
    searching = false
    searchBar.searchTextField.isSelected = true
    searchBar.showsCancelButton = true
    searchBar.delegate = self
    barController.delegate = self
    navigationItem.hidesSearchBarWhenScrolling = true

    //MARK: Move data into "data"
    var instanceCount = 0
    for i in 0..<dataEntered.count {
        data.append(dataEntered[i].name)

    if dataEntered == nil {
        dataEntered[0] = ToDoItem(name: "", date: Date(), notes: "", reminderSet: false, completed: false)
        searchBar.becomeFirstResponder() // if fields are empty then open up keyboard
    }
    searchBar.becomeFirstResponder()
    // Do any additional setup after loading the view.
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
    searchBar.becomeFirstResponder()
    searching = true
    // why is dataEntered not seen here?
    filteredData = data.filter({$0.lowercased().localizedCaseInsensitiveContains(searchText)})
    print("Before if statement, filteredData contains: \(filteredData)")
    for i in 0..<filteredData.count {
        if filteredData[i] == searchText.filter({$0.lowercased().localizedCaseInsensitiveContains(searchText)}) {
            // MARK: Original filter filteredData = data.filter({$0.lowercased().localizedCaseInsensitiveContains(searchText)})
            instanceCount += 1

        }

    }
    print("Filtered filteredData contents:\(filteredData)")
    if searchBar.isFirstResponder {
        print("SearchBar is first responder")
    }
    //.prefix(searchText.count) == searchText.lowercased() original search commands
    // assign search data to filteredData variable dataEntered.name.filter(...)
    tableVw.reloadData()

}
    // MARK: Search Filter

}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
    searching = false
    searchBar.text = ""
    filteredData.removeAll()
    tableVw.reloadData()
    searchBar.resignFirstResponder()
    if searchBar.isFirstResponder != true {
        print("Search Bar no longer has control!!")
    }
    // clear data in dataFilter or filteredData array
    // reset data in SearchBar
}

}