CODEWITHSUNDEEP
iosswiftuitableview
CAN
CAN

Reputation: 1717

Protocol from customCell to ViewController

I’ve a custom cell and in the custom cell I have a textField and I would like to know how can I make a protocol from the customCell class to call a function in my ViewController. I have did some code but stuck.

My issue is once I touch the textField I want to call a function from my ViewController.

class FirstViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, MySearchDelegate {

var search:SearchTableViewCell = SearchTableViewCell()

    override func viewDidLoad() {
    search.delegate = self

    }
}

My customCell class:

@objc protocol MySearchDelegate{
    optional func textFieldTouched()
}

class SearchTableViewCell: UITableViewCell, UITextFieldDelegate {

    @IBOutlet weak var searchField: UITextField!

    // this is where I declare the protocol
    var delegate:MySearchDelegate?

    func searchStart(){
        delegate?.textFieldTouched!()
    }

    override func awakeFromNib() {
        super.awakeFromNib()
        searchField.addTarget(self, action: Selector("searchStart"), forControlEvents: UIControlEvents.ValueChanged)
    }

    func searchStart(){
        delegate?.textFieldTouched()
    }

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

}

Upvotes: 0

Views: 61

Answers (2)

Lucho
Lucho

Reputation: 1044

I am not good on swift so it might be a mistake. You should assign the cell delegate when you create the cell. 

     class FirstViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, MySearchDelegate {

         override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
                let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! UITableViewCell

                // set the delegate here not in the viewDidLoad
        cell.searchDelegate = self

                return cell
            }

            func textFieldTouched(){
                 //do what you want here
            }
}

Upvotes: 1

rshev
rshev

Reputation: 4176

Altered your code to avoid strong reference cycles and conforming to your protocol:

    var search:SearchTableViewCell = SearchTableViewCell()

    override func viewDidLoad() {
        search.delegate = self
    }

    func textFieldTouched() {
        println("voila")
    }

}

protocol MySearchDelegate: class {
    func textFieldTouched()
}

class SearchTableViewCell: UITableViewCell, UITextFieldDelegate {

    @IBOutlet weak var searchField: UITextField!

    // this is where I declare the protocol
    weak var delegate:MySearchDelegate?

    func searchStart(){
        delegate?.textFieldTouched()
    }

    override func awakeFromNib() {
        super.awakeFromNib()
    }

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

}

Upvotes: 0

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