How do I open a alertcontroller from a button in tableview cell in ios 9?

Question

I want to open an Alertview with Call button and cancel button from button in a tableview cell.

var arrayOfUsernames: [PFObject] = [ ]

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

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

func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
    return "Tutors"
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
    let cell: CustomTableViewCell = TutorTable.dequeueReusableCellWithIdentifier("Tutor") as! CustomTableViewCell

    cell.CUsername.text = self.arrayOfUsers[indexPath.row]
    cell.Classes.text = self.arrayOfClasses[indexPath.row]
    return cell

}

here is the customtableviewcell

import UIKit

class CustomTableViewCell: UITableViewCell {

    @IBOutlet weak var CUsername: UILabel!
    @IBOutlet weak var Distance: UILabel!
    @IBOutlet weak var Classes: UILabel!
    @IBOutlet weak var Rating: UIImageView!

    @IBAction func bookNow(sender: AnyObject) {
    }

    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
    }

}

Answer 1

Since UITableViewCell is a UIView subclass, and not UIViewController, you'll need to create a variable that holds a viewController you can present from.

First, you want to add a weak viewController var to your CustomTableViewCell. I recommend using a navigationController simply because you can use that to pushViewController: if you need it for other things, and you can control the stack from it if you need. If not, you can just use the UITableViewController.

In your cellForRowAtIndexPath: method, simply set the navigationController variable in your cell class to the current navigationController or the tableViewController:

cell.navigationController = self.navigationController or... cell.viewController = self

Once you do that, in your bookNow: method, you can now use a UIViewController to present the view. Here's what the code looks like...

Your UITableViewController class:

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) → UITableViewCell? {
  let cell = tableView.dequeueReusableCellWithIdentifier("Tutor") as! CustomTableViewCell
  // setup your cell here
  cell.navigationController = self.navigationController
  // cell.viewController = self
  return cell
}

In your CustomCellClass:

weak var navigationController: UINavigationController?
// weak var viewController: UIViewController?

@IBAction func bookNow(sender: AnyObject) {
  let alertController = UIAlertController(/* setup */)
  // setup alertController
  self.navigationController?.presentViewController(alertController, animated: false, completion: nil)
  // self.viewController?.presentViewController(alertController, animated: false, completion: nil)
}

On a side note, I strongly advice changing your variable names to lower cases. Upper cases are usually used for Class names