I am trying to create a custom UISearchBar that is placed as the titleView
of a navigationController
. Using the following code, the suggestionTableView
of suggestions appears perfectly; however, It does not recognize any taps. In fact, it is like the suggestionTableView
isn’t even there because my taps are being sent to another view under the suggestion suggestionTableView
. I was told that I could use hitTest(...)
to catch these touches, but I don’t know how I would implement this in my SuggestionSearchBar
or in my ViewController
. How can I send these touches to the suggestionTableView
?
SuggestionSearchBar
class SuggestionSearchBar: UISearchBar, UISearchBarDelegate {
var suggestionTableView = UITableView(frame: .zero)
let allPossibilities: [String]!
var possibilities = [String]()
//let del: UISearchBarDelegate!
init(del: UISearchBarDelegate, dropDownPossibilities: [String]) {
self.allPossibilities = dropDownPossibilities
super.init(frame: .zero)
isUserInteractionEnabled = true
delegate = del
searchTextField.addTarget(self, action: #selector(searchBar(_:)), for: .editingChanged)
searchTextField.addTarget(self, action: #selector(searchBarCancelButtonClicked(_:)), for: .editingDidEnd)
sizeToFit()
addTableView()
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
private func addTableView() {
let cellHeight = UITableViewCell(style: UITableViewCell.CellStyle.default, reuseIdentifier: "").frame.height
suggestionTableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
suggestionTableView.backgroundColor = UIColor.clear
//suggestionTableView.separatorStyle = .none
suggestionTableView.tableFooterView = UIView()
addSubview(suggestionTableView)
suggestionTableView.delegate = self
suggestionTableView.dataSource = self
suggestionTableView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
suggestionTableView.topAnchor.constraint(equalTo: bottomAnchor),
suggestionTableView.rightAnchor.constraint(equalTo: rightAnchor),
suggestionTableView.leftAnchor.constraint(equalTo: leftAnchor),
suggestionTableView.heightAnchor.constraint(equalToConstant: cellHeight*6),
])
hideSuggestions()
}
func showSuggestions() {
let sv = suggestionTableView.superview
sv?.clipsToBounds = false
suggestionTableView.isHidden = false
}
func hideSuggestions() {
suggestionTableView.isHidden = true
}
@objc func searchBar(_ searchBar: UISearchBar) {
print(searchBar.text?.uppercased() ?? "")
showSuggestions()
possibilities = allPossibilities.filter {$0.contains(searchBar.text?.uppercased() ?? "")}
print(possibilities.count)
suggestionTableView.reloadData()
if searchBar.text == "" || possibilities.count == 0 {
hideSuggestions()
}
}
@objc func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
hideSuggestions()
}
}
extension SuggestionSearchBar: UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return possibilities.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = suggestionTableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.backgroundColor = UIColor(red: 0.25, green: 0.25, blue: 0.25, alpha: 0.75)
if traitCollection.userInterfaceStyle == .light {
cell.backgroundColor = UIColor(red: 1, green: 1, blue: 1, alpha: 0.75)
}
cell.textLabel?.text = possibilities[indexPath.row]
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
//add method that fills in and searches based on the text in that indexpath.row
print("selected")
}
}
ViewController
import UIKit
class ViewController: UIViewController {
lazy var searchBar = SuggestionSearchBar(del: self, dropDownPossibilities: ["red","green","blue","yellow"])
override func viewDidLoad() {
super.viewDidLoad()
setUpUI()
}
func setUpUI() {
setUpSearchBar()
}
}
extension ViewController: UISearchBarDelegate {
func setUpSearchBar() {
searchBar.searchBarStyle = UISearchBar.Style.prominent
searchBar.placeholder = "Search"
searchBar.sizeToFit()
searchBar.isTranslucent = false
searchBar.backgroundImage = UIImage()
searchBar.delegate = self
navigationItem.titleView = searchBar
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
print(searchBar.text!)
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
searchBar.endEditing(true)
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
}
}
2
Answers
As long as you are adding the
UITableView
as a subview to theSearchBar
orUINavigationBar
, you will keep finding these touch issues.A possible way to handle this would be have an empty container
UIView
instance at the call site (ViewController
in your case) and askSuggestionsSearchBar
to add it’stableView
inside that container.SuggestionsSearchBar
will still manage everything about the tableView’s dataSource, delegate, it’s visibility etc. It just needs a view that can hold it’s tableView from the call site.UPDATE
I’m highlighting only the relevant parts that need to change – everything else remains the same.
Reviewing your provided code, I can get the UI to work properly and even get the
UITableViewDelegate
callbacks insideSuggestionSearchBar
.Here are the changes
Suggestion Search Bar
ViewController
To summarise the changes, the code above tried to add
suggestionTableView
to the SearchBarView which is not possible so I initialized SearchBarView with the reference to the parent ViewController which is stored as
This property is later used in
addTableView()
There is another small change
in
@objc func searchBar(_ searchBar: UISearchBar) {
Result