How to pass a selected state of the cell in collectionView (Swift)

Question

I have an app with horizontal scroll collectionView and I need to pass the "selected" state to other method, which is saving. So I have custom cell in which I declare an observer:

class StoryViewCell: UICollectionViewCell {

    override var isSelected: Bool {
        didSet {
            print("Selected")
        }
    }

}

When I scroll, I got this print statements like it should be. But how can I pass this state to my ViewController? I can't access variables inside it. Are there other options to solve this?

I also tried some collectionView delegate's such as :didSelectItem and :didUpdateFocusIn context methods with no luck.

Any help is appreciated

Answer 1

We have many ways to do that so one of them:

You have to create protocols:

protocol updateDelegate {
    func update(flag: Bool)
}

And create a delegate object in cell class like that:

 var delegate: updateDelegate?

After that, Your cellForRowAt:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! DemoTableViewCell

    cell.delegate = self
    return cell
}

And cell class methods like that:

override var isSelected: Bool {
    didSet {
        print("Selected")
        delegate?.update(flag: isSelected)
    }
}

And in view controller you have to define update method:

func update(flag: Bool) {
    print("fefr")
}

It will work for you

You can find my full code below:

ViewControllor:

import UIKit

protocol updateDelegate {
    func update(flag: Bool)
}
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, updateDelegate {


    @IBOutlet weak var tableView: UITableView!
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 5
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! DemoTableViewCell

        cell.delegate = self
        return cell
    }
    func update(flag: Bool) {
        print("fefr")
    }
}

Custom cell class

class DemoTableViewCell: UITableViewCell {

     var delegate: updateDelegate?

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)

        // Configure the view for the selected state
    }
    override var isSelected: Bool {
        didSet {
            print("Selected")
            delegate?.update(flag: isSelected)
        }
    }

}