在Swift 4中单击自定义按钮时调整单元格的大小

Question

I have a view controller in which i have used table view controller in it. In my cell there is a button on which when user click the cell size should come to 550 and when click again it should come back to its original height. I have tried bit code after searching for it but it isn't working is their any solution that can work for me?. My code is bit this,

var indexOfCellToExpand: Int!

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
  if indexPath.row == indexOfCellToExpand {
    return 170 + expandedLabel.frame.height - 38
  }
  return 170
}

Answer 1

Swift 4.x

fileprivate var expandedIndexSet = Set<IndexPath>()

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    if expandedIndexSet.contains(indexPath) {
        let cell = tableView.dequeueReusableCell(withIdentifier: "CELL_EXPANDED", for: indexPath) as! CellExpanded
        return cell
    } else {
        let cell = tableView.dequeueReusableCell(withIdentifier: "CELL_COLLAPSED", for: indexPath) as! CellCollapsed
        return cell
    }
}

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    tableView.deselectRow(at: indexPath, animated: false)
    if expandedIndexSet.contains(indexPath) {
        expandedIndexSet.remove(indexPath)
    } else {
        expandedIndexSet.insert(indexPath)
    }
    tableView.reloadRows(at: [indexPath], with: .fade)
}

Answer 2

Use Auto layout for Expand-collapse Cell, Attaching Demo for that case

link:https: //www.dropbox.com/s/ieltq0honml35l8/TAbleDemo.zip?dl=0.

set cell button height constraint and update constraint on Value on select- deselect event and just reload data

in main viewcontroller code

self.tblView.estimatedRowHeight = 100
self.tblView.rowHeight = UITableViewAutomaticDimension

  func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 3
    }

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

        cell.btnExpandCollepse.addTarget(self, action: #selector(ViewController.expandCollapse(sender:)), for: .touchUpInside)
        return cell

    }

 @objc func expandCollapse(sender:UIButton) {

        self.tblView.reloadData()
    }

Code in Cell Class

@IBOutlet var btnExpandCollepse: UIButton!
@IBOutlet var constraintBtnHeight: NSLayoutConstraint!

@IBAction func onExpandCollepse(_ sender: UIButton) {

        sender.isSelected = !sender.isSelected

        if !sender.isSelected{

            self.constraintBtnHeight.constant = 50
        }else{
            self.constraintBtnHeight.constant = 500
        }
    }

for constraint check below image http://prntscr.com/hur8ym

Updated Demo for custom Content height of Lable with Autoresizing Cell https://www.dropbox.com/s/o742kflg5yeofb8/TAbleDemo%202.zip?dl=0

https://www.dropbox.com/s/o742kflg5yeofb8/TAbleDemo%202.zip?dl=0