Advanced Auto Complete Swift - ios

Question

I have created a simple autocomplete textfield (in which the autocomplete options are displayed in a tableview) through the following code:
import UIKit
class SchoolViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate {
#IBOutlet weak var schoolTextField: UITextField!
#IBOutlet weak var autoCompleteTableView: UITableView!
let schoolPossibilities = ["Redwood", "Fisher", "Bellermen", "Saratoga", "Los Gatos", "Cambell", "Mooreland", "Harker", "Challenger", "Saint Andrews", "Beckens", "Lynbrook", "Menlo", "Gunn", "Aragon", "Kipp"]
var autoCompleteSchools = [String]()
override func viewDidLoad() {
super.viewDidLoad()
autoCompleteTableView.delegate = self
schoolTextField.delegate = self
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "someCell", for: indexPath)
cell.textLabel?.text = autoCompleteSchools[indexPath.row]
return cell
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return autoCompleteSchools.count
}
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
if let text = schoolTextField.text{
let substring = (text as NSString).replacingCharacters(in: range, with: string)
searchAutoCompleteEntries(withSubstring: substring)
}
return true
}
func searchAutoCompleteEntries(withSubstring substring: String){
autoCompleteSchools.removeAll()
for key in schoolPossibilities{
let string = key as NSString
let range = string.range(of: substring)
if range.location == 0{
autoCompleteSchools.append(key)
}
}
autoCompleteTableView.reloadData()
}
}
The problem is that options only show up if what's being typed in the textfield is an EXACT match. How do I change this code so it can tolerate both uppercase and lowercase letters and slight variations?

Answer 1

Use NSCaseInsensitiveSearch as compare option in
outputString.rangeOfString(String, options: NSStringCompareOptions, range: <#T##Range<Index>?#>, locale: <#T##NSLocale?#>)