Can't not check button title from programmatically DropDown button - ios

Question

I am new in Swift and my english is not very well
The question is i build a dropdown view from this tutorial
youtube: https://youtu.be/22zu-OTS-3M
github: https://github.com/Archetapp/Drop-Down-Menu
He programmatically create a fantastic dropdown view without storyboard
the code run very good on my Xcode
but when I went to check the title with the button
I never get it.
this my code
class ViewController: UIViewController, GMSMapViewDelegate
override func viewDidLoad()
super.viewDidLoad()
let typeBTN = dropDownBtn()
self.view.addSubview(typeBTN)
typeBTN.setTitle("animal", for: .normal)
typeBTN.dropView.dropDownOptions = ["dog", "cat", "cow", "boy"]
// ....
protocol dropDownProtocol {
func dropDownPressed(string: String)
}
class dropDownBtn: UIButton, dropDownProtocol {
func dropDownPressed(string: String) {
self.setTitle(string, for: .normal)
self.dismissDropDown()
}
var dropView = dropDownView()
var height = NSLayoutConstraint()
override init(frame: CGRect) {
super.init(frame: frame)
self.backgroundColor = UIColor.darkGray
dropView = dropDownView.init(frame: CGRect.init(x: 0, y: 0, width: 0, height: 0))
dropView.delegate = self
dropView.translatesAutoresizingMaskIntoConstraints = false
}
override func didMoveToSuperview() {
self.superview?.addSubview(dropView)
self.superview?.bringSubviewToFront(dropView)
dropView.topAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
dropView.centerXAnchor.constraint(equalTo: self.centerXAnchor).isActive = true
dropView.widthAnchor.constraint(equalTo: self.widthAnchor).isActive = true
height = dropView.heightAnchor.constraint(equalToConstant: 0)
}
var isOpen = false
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
if isOpen == false {
isOpen = true
NSLayoutConstraint.deactivate([self.height])
if self.dropView.tableView.contentSize.height > 150 {
self.height.constant = 170
} else {
self.height.constant = self.dropView.tableView.contentSize.height
}
NSLayoutConstraint.activate([self.height])
UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.5, options: .curveEaseOut, animations: {
self.dropView.layoutIfNeeded()
self.dropView.center.y += self.dropView.frame.height / 2
}, completion: nil)
}else{ dismissDropDown() }
}
func dismissDropDown() {
isOpen = false
NSLayoutConstraint.deactivate([self.height])
self.height.constant = 0
NSLayoutConstraint.activate([self.height])
UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 0.5, initialSpringVelocity: 0.5, options: .curveEaseOut, animations: {
self.dropView.center.y -= self.dropView.frame.height / 2
self.dropView.layoutIfNeeded()
}, completion: nil)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
class dropDownView: UIView, UITableViewDelegate, UITableViewDataSource {
var dropDownOptions = [String]()
var tableView = UITableView()
var delegate: dropDownProtocol!
override init(frame: CGRect) {
super.init(frame: frame)
tableView.backgroundColor = UIColor.darkGray
tableView.delegate = self
tableView.dataSource = self
self.addSubview(tableView)
tableView.translatesAutoresizingMaskIntoConstraints = false
tableView.leftAnchor.constraint(equalTo: self.leftAnchor).isActive = true
tableView.rightAnchor.constraint(equalTo: self.rightAnchor).isActive = true
tableView.topAnchor.constraint(equalTo: self.topAnchor).isActive = true
tableView.bottomAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return dropDownOptions.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = UITableViewCell()
cell.textLabel?.text = dropDownOptions[indexPath.row]
cell.backgroundColor = UIColor.darkGray
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
self.delegate.dropDownPressed(string: dropDownOptions[indexPath.row])
print(dropDownOptions[indexPath.row])
I have tried a lot to check when button title change. like this
print(typeBTN.currentTitle!)
print(typeBTN.titleLabel?.text! )
print(typeBTN.title(for: .normal))
//I get nothing when i pressed dropdown menu options?
because I want to do this
if typeBTN.currentTitle == "dog" {
//show some date at my mapview
}
but when I click the "dog" of dropdown menu
it never work
can somebody help me?

Answer 1

You can use the Delegation pattern to notify the title changes to your view controller.
Add the protocol:
protocol DropDownButtonDelegate: AnyObject {
func titleDidChange(_ newTitle: String)
}
Add in your DropDownButton class a delegate property:
weak var delegate: DropDownButtonDelegate?
Then in your dropDownPressed function:
func dropDownPressed(string: String) {
self.setTitle(string, for: .normal)
self.dismissDropDown()
delegate?.titleDidChange(string)
}
And finally in your view controller implement the DropDownButtonDelegate:
class ViewController: UIViewController, GMSMapViewDelegate {
override func viewDidLoad() {
super.viewDidLoad()
let typeBTN = dropDownBtn()
self.view.addSubview(typeBTN)
typeBTN.delegate = self
typeBTN.setTitle("animal", for: .normal)
typeBTN.dropView.dropDownOptions = ["dog", "cat", "cow", "boy"]
}
}
extension ViewController: DropDownButtonDelegate {
func titleDidChange(_ newTitle: String) {
print(newTitle)
}
}