A simple example of setting up a delegate in Swift.

swiftDelegateExample.swift

//
//  ExampleCode.swift
//

import UIKit

// MARK: - Protocol

protocol SearchQueryProviderProtocol : class {    // 'class' means only class types can implement it
  func searchQueryData() -> String
}


// MARK: - Table view controller

class MyTableViewController : UITableViewController {

  override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    // Try to get a cell
    let cell : MyTableViewCell
    if let theCell = tableView.dequeueReusableCellWithIdentifier(MyTableViewCell.reuseIdentifier) as? MyTableViewCell {
      cell = theCell
    } else {
      cell = MyTableViewCell()
    }
    cell.bind(self, title: "This is cell # \(indexPath.row) in the table view")
    return cell
  }

  // Other table view delegate/data source methods

  override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return 1
  }

  override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return 10
  }
}

extension MyTableViewController : SearchQueryProviderProtocol {

  func searchQueryData() -> String {
    // TODO: actual implementation...
    return "hello world"
  }
}


// MARK - Cell

class MyTableViewCell : UITableViewCell {

  weak var delegate : SearchQueryProviderProtocol?

  static let reuseIdentifier = "MyTableViewCell"

  func bind(delegate: SearchQueryProviderProtocol, title: String) {
    self.delegate = delegate
    textLabel?.text = title
  }

  func doSomethingWhenTapped() {
    // TODO: actually set up the cell so this method is called when tapped
    if let parentSearchData = delegate?.searchQueryData() {
      // TODO: do something with your data...
    } else {
      println("Something is wrong, this cell's delegate wasn't set...")
    }
  }
}

Click here for set custom delegate and protocol method