Set Title of UIButton from Selected Row of UIPickerView in swift - swift

Question

I am trying to set my Button title from a selected row from uipickerview. However, I can't seem to find a valid solution.
I have set the variables to be global thus I can access the Selected Variable. However I cant seem to be able to pinpoint exactly when the user clicks the exit button and able to update my button title.
Things I have tried:
Global Functions ( couldn't work because you cant specify the button you want to change the name of )
Dispatchqueue.main.async - Did not update my title. The idea here is for it to constantly check for a string change.
The solution I found here is in Obj-C. I tried converting it to swift https://objectivec2swift.com/#/converter/code/ with no luck.
Set Title of UIButton from Selected Row of UIPickerView
#IBAction func CountryPickButton(_ sender: UIButton) {
Global.setPickerDataSource(data:["Test","test2","test3"])
Global.setPickerCompletionHandler(int:0)
let popOverVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "PickerViewPopUpId") as! PickerViewController
//CountryPickButtonDetector = sender as? UIButton
self.addChild(popOverVC)
popOverVC.view.frame = self.view.frame
self.view.addSubview(popOverVC.view)
popOverVC.didMove(toParent: self)
popOverVC.callback { value in
//CountryPickButton.title.text = value
sender.setTitle(value, for: UIControl.State)
}
}
import UIKit
var test = ""
class PickerViewController: UIViewController {
#IBOutlet weak var PickerView: UIPickerView!
var callback : ((String) -> Void)?
override func viewDidLoad() {
super.viewDidLoad()
//self.view.backgroundColor = UIColor.black.withAlphaComponent(0.8)
PickerView.dataSource = self
PickerView.delegate = self
// Do any additional setup after loading the view.
}
#IBAction func ExitButton(_ sender: Any) {
switch Global.pickerCompletionHandler {
case 0:
callback?(Global.pickerResult ?? "")
Global.setProfileCountry(string:
Global.pickerResult ?? "")
default:
print("nothing")
}
self.view.removeFromSuperview()
}
}
extension PickerViewController: UIPickerViewDelegate, UIPickerViewDataSource {
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1 // can be more than 1 component like time/date/year
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return Global.pickerDataSource?.count ?? 1
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
//Global.pickerResult = Global.pickerDataSource?[row]
Global.setPickerResult(result: Global.pickerDataSource?[row] ?? "Test" )
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return Global.pickerDataSource?[row]
}
}
Globals
import Foundation
struct Global {
static var pickerDataSource:[String]? = nil
static var pickerResult:String? = nil
static var pickerCompletionHandler:Int? = 0
static var profileCountry:String? = nil
static func setPickerDataSource(data:[String]) {
Global.pickerDataSource = data
}
static func setPickerResult(result:String) {
Global.pickerResult = result
}
static func setPickerCompletionHandler(int: Int) {
Global.pickerCompletionHandler = int
}
static func setProfileCountry(string: String)
{
Global.profileCountry = string
}
}

Answer 1

I don't know what all that Global stuff is, the easiest solution might be to extend pickerCompletionHandler, but here is another (easy) one:
In PickerViewController add a callback passing a String value and no return value
var callback : ((String) -> Void)?
and call it in exitButton (please, please variable and function names are supposed to start with a lowercase letter)
#IBAction func exitButton(_ sender: Any) {
switch Global.pickerCompletionHandler {
case 0:
callback?(Global.pickerResult ?? "")
Global.setProfileCountry(string:
Global.pickerResult ?? "")
default:
print("nothing")
}
self.view.removeFromSuperview()
}
In countryPickButton (again: lowercase letter) set the callback and set sender to the real type. The callback sets the title
#IBAction func countryPickButton(_ sender: UIButton) {
Global.setPickerDataSource(data:["Test","test2","test3"])
Global.setPickerCompletionHandler(int:0)
let popOverVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "PickerViewPopUpId") as! PickerViewController
popOverVC.callback = { value in
sender.setTitle(value, for: .normal)
}
...