Performing a segue from a button within a custom UITableViewCell

Question

I want to perform a segue from a button within a custom UITableViewCell, but I don't know how to access the cell's contents when I push that button. I realize that this could be accomplished through didSelectRowAtIndexPath, however I have that method performing another function, and I would like to use the button I have created within the table cell.

Here is my perform segue method I'm having trouble with:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
{
    if segue.identifier == "showComments"
    {
        let vc:CommentOnPostViewController = segue.destinationViewController as CommentOnPostViewController

        var buttonPosition:CGPoint = sender?.convertPoint(CGPointZero, toView: self.feed) as CGPoint!
        var path:NSIndexPath = self.feed.indexPathForRowAtPoint(buttonPosition) as NSIndexPath!

        var postToCommentOn:PFObject = feedList[path.row] as PFObject
        vc.post = postToCommentOn as PFObject
    }
}

I tag the button in the cell when displaying it, and give it a target action:

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
    // There is code that goes here for creating and displaying the cell.

    cell.commentButton.tag = indexPath.row
    cell.commentButton.addTarget(self, action: "addComment", forControlEvents: UIControlEvents.TouchUpInside)
}

Here is the action that is called when pressing the button:

func addComment()
{
    self.performSegueWithIdentifier("showComments", sender: self)
}

Any help is appreciated. Thanks!

Answer 1

Create a Protocol with the Method, that will be called by the CustomCell's Delegate, defined on your TableViewController

//Pass any objects, params you need to use on the 
//segue call to send to the next controller.

protocol MyCustomCellDelegator {
    func callSegueFromCell(myData dataobject: AnyObject)
}

Now use the Protocol on your UITableViewController

class MyTableViewController : UITableViewController, MyCustomCellDelegator {


 //The usual Defined methods by UIViewController and UITableViewController 

 func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

  //Set the CustomCell new Delegate
  var cell = tableView.dequeueReusableCellWithIdentifier(customIdentifier) as MyCustomCell


  cell.delagete = self

  return cell

 }


 //MARK: - MyCustomCellDelegator Methods

 func callSegueFromCell(myData dataobject: AnyObject) {
   //try not to send self, just to avoid retain cycles(depends on how you handle the code on the next controller)
   self.performSegueWithIdentifier("showComments", sender:dataobject )

 }

}

Define the Delegate on your Custom Cell and the Call inside your New Button the Delegate Function.

class MyCustomCell : UITableViewCell {

      var delegate:MyCustomCellDelegator!
      @IBOutlet weak var myButton:UIButton



     @IBAction func buttonPressed(sender:AnyObject){
           var mydata = "Anydata you want to send to the next controller"
           if(self.delegate != nil){ //Just to be safe.
             self.delegate.callSegueFromCell(mydata)
           }
    }
}

Hopefully this can be clean and clear for you to understand and implement in your code.

Answer 2

I found an swiftier answer for passing data with a button in a dynamic cell to a new VC.

1. Setting up a Tableview, a custom cell (connect the cell with your created class and set a cell-identifier) and create a new VC and connect it via a segue (also set an identifier for the segue) to your current TableViewController

2. setting up your cell with the outlet (cellButton)

   class CustomCell: UITableViewCell {
       @IBOutlet weak var cellButton: UIButton!
   
   
      override func awakeFromNib() {
          super.awakeFromNib()
      }
   
      override func setSelected(_ selected: Bool, animated: Bool) {
         super.setSelected(selected, animated: animated)
      }
   }
   

3. CellForRowAt function in the TableViewController-Class

   override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell{
       let cell = tableView.dequeueReusableCell(withIdentifier: "customCell", for: indexPath) as! CustomCell
   
       //...Do stuff for your cell
   
       cell.cellButton.tag = indexPath.row //or value whatever you want (must be Int)
       cell.cellButton.addTarget(self, action: #selector(TableViewController.buttonTapped(_:)), for: UIControlEvents.touchUpInside)
    }
   

4. set up the button method that's called by the target of the button

   func buttonTapped(_ sender:UIButton!){
       self.performSegue(withIdentifier: "customSegueIdentifier", sender: sender)
   }
   

5. prepare for segue function

   override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
       if(segue.identifier == "customSegueIdentifier") {
           if let destination = segue.destination as? YourNewViewController {
   
              if let button:UIButton = sender as! UIButton? {
                  print(button.tag) //optional
                  destination.valueViaSegue = button.tag
              }
           }
       }
   }
   

Hope this code will help you guys. keep coding ;)

Answer 3

Here's what I did

In your UITableViewCell class, added the following

protocol MyCustomCellDelegator {

    func callSegueFromCell(myData dataobject: AnyObject)

}
class MyUITableViewCell: UITableViewCell {

    var delegate:MyCustomCellDelegator!

    .......


    @IBAction func buttonPress (_ sender: Any){


        if(self.delegate != nil){

            self.delegate.callSegueFromCell(myData: )

        }

    }

}

And in the UITableViewController

class STVHomeViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, MyCustomCellDelegator {


    .....

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


        if let cell = tableView.dequeueReusableCell(withIdentifier: "MyIdentifier") as? MyIdentifierCell {

            // configure your cell
            cell.configureCell(myIdentifier:)

            // This line is important 
            cell.delegate = self

            return cell

        } else {

            return MyIdentifierCell()
        }

    }

    func callSegueFromCell(myData dataobject: AnyObject) {

        print(dataobject)
        self.performSegue(withIdentifier: "goToNextVC", sender: dataobject )


    }

}