Filter data from TableView - swift

Question

How can I filter a tableView by search bar? I fetch data to the tableView from a Firebase database and my search bar is inside navigationBar.
This is my code:
class TableViewCustomer: UIViewController, UITableViewDelegate, UITableViewDataSource {
var ref:DatabaseReference!
var customerList = [CustomerModel]()
lazy var searchBar: UISearchBar = UISearchBar(frame: CGRect(x: 0, y: 0, width: 300, height: 20))
#IBOutlet weak var tableViewCustomer: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
searchBar.placeholder = "Search"
navigationItem.titleView = searchBar
if let textfield = searchBar.value(forKey: "searchField") as? UITextField {
textfield.textColor = UIColor.gray
if let backgroundview = textfield.subviews.first {
backgroundview.backgroundColor = UIColor.white
backgroundview.layer.cornerRadius = 18
backgroundview.clipsToBounds = true
}
}
tableViewCustomer.delegate = self
tableViewCustomer.dataSource = self
ref = Database.database().reference().child("Customer");
ref.observe(DataEventType.value, with: { (snapshot) in
if snapshot.childrenCount > 0 {
self.customerList.removeAll()
for results in snapshot.children.allObjects as! [DataSnapshot] {
let results = results.value as? [String: AnyObject]
let name = results?["Name and surname"]
let phone = results?["Phone"]
let company = results?["Company name"]
let myCustomer = CustomerModel(name: name as? String, phone: phone as? String, company: company as? String)
self.customerList.append(myCustomer)
}
self.tableViewCustomer.reloadData()
}
})
}
override var preferredStatusBarStyle: UIStatusBarStyle {
return .lightContent
}
#objc func buttonAction(sender: UIButton!) {
dismiss(animated: true, completion: nil)
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return customerList.count
}
public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableViewCustomer.dequeueReusableCell(withIdentifier: "cellCustomer") as! TableViewCellCustomer
cell.layer.backgroundColor = UIColor.init(white: 1, alpha: 0.7).cgColor
let customer: CustomerModel
customer = customerList[indexPath.row]
cell.nameLabel.text = customer.name
cell.phoneLabel.text = customer.phone
cell.companyLabel.text = customer.company
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
performSegue(withIdentifier: "description", sender: self)
}
}

Answer 1

Add your search bar, and an empty array. As you search add the suitable items to the empty array, then remove them from the array. Use the new array to index into your UI.