CODEWITHSUNDEEP
iosswiftuitableviewuiswitch
Nikhil Sridhar
Nikhil Sridhar

Reputation: 1740

Switches in Tableviews

I have the following custom UITableViewCell:

enter image description here

I want my view controller to be notified when somebody flips a cell's switch in order to update my model. I've tried using the table view's delegate methods (didSelect, didFinishEditing, didHighlight, etc.) but none of them are called upon this action. Is there any way to do what I want to do? Somebody please help.

Upvotes: 1

Views: 210

Answers (2)

Eugene Brusov
Eugene Brusov

Reputation: 17854

To update your model when somebody flips a cell's switch you need:

  1. Assign cell's @IBAction func onSwitched(_ sender: UISwitch) as UISwitch Value Changed listener as shown on this screenshot

    enter image description here

  2. Attach color model to cell

    cell.myColorModel = myColorModels[indexPath.row]

  3. In @IBAction func onSwitched(_ sender: UISwitch) simply change selected property in model

    @IBAction func onSwitched(_ sender: UISwitch) { myColorModel.selected = sender.isOn }

FULL SOURCE CODE

class MyColorModel {  

    var title: String!
    var color: UIColor!
    var selected: Bool = false

    init(title: String, color: UIColor) {
        self.title = title
        self.color = color
    }
}

class MyColorCell: UITableViewCell {

    @IBOutlet weak var colorTitle: UILabel!
    @IBOutlet weak var colorImage: UIImageView!
    @IBOutlet weak var colorSwitch: UISwitch!

    var myColorModel: MyColorModel! {
        didSet {
            colorTitle.text = myColorModel.title
            colorImage.backgroundColor = myColorModel.color
            colorSwitch.isOn = myColorModel.selected
        }
    }

    @IBAction func onSwitched(_ sender: UISwitch) {
        myColorModel.selected = sender.isOn
    }

}

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

    fileprivate var myColorModels = [MyColorModel(title: "Red", color: UIColor.red),
                                 MyColorModel(title: "Green", color: UIColor.green),
                                 MyColorModel(title: "Blue", color: UIColor.blue)]


    @IBAction func onColorsCheck(_ sender: AnyObject) {
        for myColorModel in myColorModels {
            print("color \(myColorModel.title) \((myColorModel.selected) ? "is checked":"is not checked")")
        }
    }

    // MARK: - UITableView datasource & delegate

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return myColorModels.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "MyColorCell") as! MyColorCell

        cell.myColorModel = myColorModels[indexPath.row]

        return cell
    }
}

Upvotes: 0

Anbu.Karthik
Anbu.Karthik

Reputation: 82776

actually your UISwitch has added to accessoryView of UITableViewCell, so do like on cellforRowAtIndex

var switchView = UISwitch(frame: CGRect.zero)
aCell.accessoryView = switchView
lightSwitch.tag = indexPath.row
switchView.setOn(false, animated: false)
switchView.addTarget(self, action: #selector(switchChanged(_:), for: .valueChanged)

and get the action of UISwitch as 

func switchChanged(_ sender: UISwitch) {

    print("which switch is \(sender.tag)")
    print("The switch is \(sender?.on ? "ON" : "OFF")")
}

Upvotes: 5

Related Questions