CODEWITHSUNDEEP
iosswiftuitableviewuibutton
Devil
Devil

Reputation: 17

Increase and Decrease values on Button click

I want to show value on UIlabel. when I press UIbutton to increase or decrease values on label. This is my code and when I am running my project but I didn't get any value on my uilabel.

@IBAction func btnIncreaseAction(_ sender: Any) {


    var count = 0
    count = (count + 1)

   if let cell = (sender as? UIButton)?.superview?.superview?.superview as? ShoppingCell
    {
        //cell.lblForOnty.text = "\(cell.lblForOnty.text ?? 0 + 1)"
        cell.lblForOnty.text = String(count)
    }



}



  func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "CellRID") as! ShoppingCell

    var someValue: Int = 0 {
        didSet {
            cell.lblForOnty.text = "\(count)"
        }
    }

    return cell
}
}

Upvotes: 0

Views: 5440

Answers (4)

Sanjukta
Sanjukta

Reputation: 1055

Please follows these step:

Step 1 :

create object class

class QuantityBO : NSObject{
var quantity      : Int?
}

step 2: Create global array in your class

var arrQuantityList = [QuantityBO]()

step 3 :

Assign the value according to your number of cell
It may be change according to your api resonse

step 4:

In cellForRowAt method please write:

cell.lblQuantity.text = String(arrQuantityList[indexPath.row].quantity)
cell.yourBtnName.tag = indexPath.row

step 5:

On your button action

arrQuantityList[sender.tag].quantity = arrQuantityList[sender.tag].quantity + 1
let indexPath = NSIndexPath(forRow: sender.tag, inSection: 0)
tableView.reloadRowsAtIndexPaths([indexPath], withRowAnimation:   UITableViewRowAnimation.none)

It may helps to you.hank you.

Upvotes: 0

vadian
vadian

Reputation: 285082

superview?.superview?.superview is pretty weird. Don't do that. A callback is more reliable.

In the subclass ShoppingCell create a callback and the IBActions for in- and decrease . Connect the actions to the buttons

class ShoppingCell: UITableViewCell {

    @IBOutlet weak var lblForOnty: UILabel!

    var callback : ((Int)->())?

    var counter = 0 {
      didSet {
         lblForOnty.text = "\(count)"
      }
    }

    @IBAction func btnIncreaseAction(_ sender: UIButton) {
        counter += 1
        callback?(counter)
    }

    @IBAction func btnDecreaseAction(_ sender: UIButton) {
        if counter > 0 { counter -= 1 }
        callback?(counter)
    }

}

In cellForRow pass the counter value to the cell and use the callback to update the model which is represented by dataSource and which is a custom struct or class containing a property counter.

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "CellRID", for: indexPath) as! ShoppingCell

    let item = dataSource[indexPath.row]
    cell.counter = item.counter
    cell.callback = ( newValue in
        item.counter = newValue
    }

    return cell
}

No hassle with superviews and index paths.

Upvotes: 2

Sharad Chauhan
Sharad Chauhan

Reputation: 4891

This is the code which should be in your ViewController. I am assuming that numberOfSections is 1 and in numberOfRowsInSection you are passing then number of rows you want. Else you need to modify this line : let indexPath = IndexPath(row: sender.tag, section: 0).

var count = 0 // Count variable should be a global variable, you need it to decrease the value too.
@objc func increaseCounter(sender: UIButton) {
    //increase logic here
    count = (count + 1)
    let indexPath = IndexPath(row: sender.tag, section: 0)
    let cell = tableView.cellForRow(at: indexPath)
    cell.lblForOnty.text = "\(count)"
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "CellRID") as! ShoppingCell

    // Add tag and action to your button
    cell.yourButton.tag = indexPath.row
    cell.yourButton.addTarget(self, action: #selector(increaseCounter(sender:)), for: .touchUpInside)

    return cell
}

Upvotes: 2

devgariya
devgariya

Reputation: 41

Move you count variable outside of the function Increment/decrement the count inside the function and reload the table or you can reload particular index as well. PFB the code snipped

let indexPath = NSIndexPath(forRow: rowNumber, inSection: 0)
tableView.reloadRowsAtIndexPaths([indexPath], withRowAnimation:   UITableViewRowAnimation.Top)

Upvotes: 1

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