How To Share Same UIView Between Multiple UITableView Cells - ios

Question

Objective
When the user clicks on any of the 3 blue buttons, all buttons change to the same color.
Note: this is an abstraction of a shared progress view problem, it's therefore important that only one UIView is shared (or mimicked) across my three rows
Here is a compilable Swift project:
import UIKit
class ToggleButton: UIButton {
var connectedView: UIView?
func onPress() {
self.isHidden = true
self.connectedView?.isHidden = false
}
}
class ViewController : UIViewController, UITableViewDelegate, UITableViewDataSource {
var tableView: UITableView = UITableView(frame: CGRect(x: 0, y: 0, width: 300, height: 300))
var myView: UIView? = nil
var toggleBtn: ToggleButton? = nil
override func viewDidLoad() {
self.setupTableView()
}
fileprivate func setupTableView() {
self.tableView.dataSource = self
self.tableView.delegate = self
self.tableView.backgroundColor = UIColor.white
self.tableView.isOpaque = true
self.view.addSubview(self.tableView)
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 3
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = UITableViewCell(style: .default, reuseIdentifier: "CellIdentifier")
let frame = CGRect(x: 10, y: 10, width: 30, height: 30)
if let view = self.myView, let btn = self.toggleBtn {
cell.addSubview(view)
cell.addSubview(btn)
} else {
let myView = UIView(frame: frame)
myView.backgroundColor = UIColor.green
myView.isHidden = true
cell.addSubview(myView)
let toggleBtn = ToggleButton(frame: frame)
toggleBtn.backgroundColor = UIColor.blue
toggleBtn.addTarget(self, action: #selector(onPress), for: .touchUpInside)
toggleBtn.connectedView = myView
cell.addSubview(toggleBtn)
}
return cell
}
#objc func onPress(_ sender: Any) {
if let button = sender as? ToggleButton {
button.onPress()
}
}
}
Any help appreciated.

Answer 1

The concept of UITableViewCell is made to be very independent each other.
So the only thing you can do it having a bool flag in your ViewController, then you init your 3 cells with this flags.
And finally each time the button is pressed you toggle the flag en reload your tableView.