Multi tool use

Identify in which table view Cell button was pressed?

I have table view cells like quiz. And in each cell I have a buttons And how can I identify in which cell button was pressed. Maybe by IndexPath???
This is how I connected button to

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "QuestionCell")!
variant1 = cell.contentView.viewWithTag(1) as! UIButton
variant2 = cell.contentView.viewWithTag(2) as! UIButton
variant3 = cell.contentView.viewWithTag(3) as! UIButton
variant4 = cell.contentView.viewWithTag(4) as! UIButton

variant1.addTarget(self, action: #selector(self.variant1ButtonPressed), for: .touchUpInside)
variant2.addTarget(self, action: #selector(self.variant2ButtonPressed), for: .touchUpInside)
variant3.addTarget(self, action: #selector(self.variant3ButtonPressed), for: .touchUpInside)
variant4.addTarget(self, action: #selector(self.variant4ButtonPressed), for: .touchUpInside)

return cell
}

func variant1ButtonPressed() {
print("Variant1")
variant1.backgroundColor = UIColor.green


}
func variant2ButtonPressed() {
print("Variant2")
variant2.backgroundColor = UIColor.green


}
func variant3ButtonPressed() {
print("Variant3")
variant3.backgroundColor = UIColor.green

}
func variant4ButtonPressed() {
print("Variant4")
variant4.backgroundColor = UIColor.green

}


This is how it looks like in Storyboard:

5 Answers
5

Use this line to get indexPath, Where you have to pass UIButton on target selector

UIButton

func buttonTapped(_ sender:AnyObject) {
let buttonPosition:CGPoint = sender.convert(CGPointZero, to:self.tableView)
let indexPath = self.tableView.indexPathForRow(at: buttonPosition)
}


You should use delegate pattern, basic example:

protocol MyCellDelegate {
func didTapButtonInside(cell: MyCell)
}

class MyCell: UITableViewCell {

weak var delegate: MyCellDelegate?

func buttonTapAction() {
delegate?.didTapButtonInside(cell: self)
}
}

class ViewController: MyCellDelegate {

let tableView: UITableView

func didTapButtonInside(cell: MyCell) {
if let indexPath = tableView.indexPath(for: cell) {
print("User did tap cell with index: (indexPath.row)")
}
}
}


Since actions need to be inside the view controller, ctrl + drag from your button to the view controller - this will use the responder chain.

Basically you need to convert the view (button) to the coordinate system of the table view in order to tell what is the IndexPath and if you have the IndexPath you have the object that corresponds to the button inside the cell that was tapped:

@IBAction func buttonTapped(_ sender: Any)
{
if let indexPath = getIndexPath(of: sender)
{
// Your implementation...
}
}

private func getIndexPath(of element:Any) -> IndexPath?
{
if let view = element as? UIView
{
// Converting to table view coordinate system
let pos = view.convert(CGPoint.zero, to: self.tableView)
// Getting the index path according to the converted position
return tableView.indexPathForRow(at: pos) as? IndexPath
}
return nil
}


It is important to mention that there many solutions for your question. But you should know that in Apple's sample projects they also use this technic.

tableView.indexPathForRow(at: pos)

UITableViewCell

func tableViewCellDidTapButton(_ cell: UITableViewCell)

tableView.indexPath(for: UITableViewCell)

This is how you add tag to a UIButton inside UITableView, add below lines of code in

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

cell.yourButton.tag = indexPath.row
cell.yourButton.addTarget(self, action:#selector(btnPressed(sender:)), for: .touchUpInside)


Add this function in your ViewController

func btnPressed(sender: UIButton)
{
print("Button tag (sender.tag)")
}


Hope this helps...

Simple Subclass button just like JSIndexButton

class JSIndexButton : UIButton {

var indexPath : IndexPath!

}


Now at cellForRowAt

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

let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! ItemCell

let itemCategory = dataList[button.indexPath.section];
let item = itemCategory.items[button.indexPath.row];

cell.imgView.setImageWithURL(item.photoUrl);
cell.btnBuy.indexPath = indexPath;
cell.btnBuy.addTarget(self, action: #selector(JSCollapsableTableView.btnBuyPressed(_:)), for: UIControlEvents.touchUpInside)

return cell;

}


Check Button Action

@IBAction func btnBuyPressed(_ button: JSIndexButton) {

let itemCategory = dataList[button.indexPath.section];
let item = itemCategory.items[button.indexPath.row];

}


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