how to activate slider IBAction from cell in TableViewCell? [duplicate] - ios

Question

This question already has an answer here:
Swift Using a UISlider in a UITableViewCell the right way?
(1 answer)
Closed 2 years ago.
My program is creating slider in dynamic cell. I can't just create IBAction using ctrl+"drag and drop" on slider because it is in cell, not in viewController. How can I create this IBAction in ViewController?
class SecondViewController: UIViewController {
var gradesNumber: Int?
var gradeArray: [Grade] = []
#IBOutlet weak var topLabel: UILabel!
#IBOutlet weak var gradesTableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
gradesTableView.dataSource = self
for i in 1...gradesNumber! {
gradeArray.append(Grade(sliderValue: 5, title: "Grade \(i)", grade: "5"))
}
gradesTableView.register(UINib(nibName: "TableViewCell", bundle: nil), forCellReuseIdentifier: "ReusableCell")
}
#IBAction func calculateButton(_ sender: UIButton) {
var avg = 0.0
for i in gradeArray {
avg += Double(i.grade)!
}
topLabel.text = "Avg: \(avg/Double(gradesNumber!))"
}
}
extension SecondViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return gradesNumber ?? 1
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "ReusableCell", for: indexPath) as! TableViewCell
cell.gradeSlider.tag = indexPath.row
cell.gradeSlider.setValue(5, animated: true)
let slider: Grade = gradeArray[indexPath.row]
cell.gradeValue.text = slider.grade
cell.gradeNumber.text = slider.title
return cell
}
}

Answer 1

As Lucas says in his comment, you can create a custom subclass of UITableViewCell and attach the action to the cell class. Then you'd forward the message from the cell to the owning table view. (You'd probably need a delegate property on the cell class so you know who to forward the action to.)
Alternately, you could configure the IBAction in your cellForRowAt method:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "ReusableCell", for: indexPath) as! TableViewCell
//other config code
//Make sure the slider doesn't already have the action attached.
if cell.gradeSlider.actions(forTarget: nil, forControlEvent: .valueChanged) == nil {
cell.gradeSlider.addTarget(self, action: #selector(actionSelector(:)), controlEvents: .valueChanged]
}
return cell
}