tableView.reloadSections(sectionIndex, with: .none) not working properly

Question

I created 3 headerViews and added check box, when select section0 check box i want to expand cells in that section. First time it's creating all sections and when I select check box creating cells, but when i deselect check box it's not hide /removing cells. But i want to remove all cells or hide all cells in section0, section1 etc...

My code is

var dateArray:[String]?//Globally
var button:UIButton?//Globally

//Mark - TableView Datasource
 func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    if tableView == filterView?.filterTblView {
        if section == 0 {
            print(dateArray?.count ?? 0)
            return dateArray?.count ?? 0
        } else if section == 1 {
            return callTypeArray.count
        } else {
            return departmentArray.count
        }
    }
    else {
        return 0
    }
}


func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let height:CGFloat!
        if UIDevice.current.userInterfaceIdiom == .pad {
            height = 60
        } else {
            height = 40
        }
        //Create header view
        let headerView = UIView(frame: CGRect(x: 0, y: 0, width: tableView.frame.width, height: height))
        let lbl = UILabel(frame: CGRect(x: 50, y: 0, width: headerView.frame.width - 50, height: headerView.frame.height))
        lbl.textAlignment = .left

        lbl.text = sectionsArray[section]
        headerView.addSubview(lbl)

        button = UIButton(type: .custom)
        button?.frame = CGRect(x: 10, y: 5, width: 30, height: 30)
        button?.addTarget(self, action: #selector(self.onclickDateCheckMark), for: .touchUpInside)
        button?.setImage(UIImage.init(named: "uncheck"), for: UIControl.State.normal)
        button?.setImage(UIImage.init(named: "check"), for: UIControl.State.selected)
        headerView.addSubview(button!)
        button?.tag = section

        return headerView
}


@objc func onclickDateCheckMark(sender:UIButton) {
    if sender.tag == 0 {
        if sender.isSelected == true {
            sender.isSelected = false
            DispatchQueue.main.async {
//                        self.dateArray?.removeAll()
//                    let indexPaths = self.filterView?.filterTblView.indexPathsForVisibleRows
//                    print(indexPaths as Any)
//                    self.filterView?.filterTblView.reloadRows(at: indexPaths!, with: UITableView.RowAnimation.top)

                self.dateArray?.removeAll()
                let sectionIndex = IndexSet(integer: 0)
                   self.filterView?.filterTblView.reloadSections(sectionIndex, with: .none) // or fade, right, left, top, bottom, none, middle, automatic
            }
        } else {
            DispatchQueue.main.async {
                self.dateArray = ["Today", "Yesterday", "This week", "Last week", "This month", "Last month", "Last 30days"]
//                    print(self.dateArray!)
//                    let indexPaths = self.filterView?.filterTblView.indexPathsForVisibleRows
//                    print(indexPaths as Any)
//                    self.filterView?.filterTblView.reloadRows(at: indexPaths!, with: UITableView.RowAnimation.top)
                let sectionIndex = IndexSet(integer: 0)
                self.filterView?.filterTblView.reloadSections(sectionIndex, with: .none) // or fade, right, left, top, bottom, none, middle, automatic
            }
            sender.isSelected = true
        }
    }

    if sender.tag == 1 {
        if sender.isSelected == true {
            sender.isSelected = false
            DispatchQueue.main.async {
                self.callTypeArray?.removeAll()
                let sectionIndex = IndexSet(integer: 1)
                self.filterView?.filterTblView.reloadSections(sectionIndex, with: .none)
            }
        } else {
            DispatchQueue.main.async {
                self.callTypeArray = ["1", "2", "3", "4"]
                let sectionIndex = IndexSet(integer: 1)
                self.filterView?.filterTblView.reloadSections(sectionIndex, with: .none)
            }
            sender.isSelected = true
        }
    }

    if sender.tag == 2 {
        if sender.isSelected == true {
            sender.isSelected = false
        } else {
            sender.isSelected = true
        }
    }


}

As per my observation actually here in viewForHeaderInSection section: check box button once again creating when i call reloadSections. Thats why it's not entering into if condition if sender.isSelected == true { } in onclickDateCheckMark it's directly entering false condition.

Answer 1

1. Create 2 arrays, first for datasource and second for to store selected section index.

   var arrDataSource : [Any] = [] // your data for all three section, datatype will be as per your requirement
   var arrSelectedIndex : [Int] = [] // initially its empty as when VC loads on section will be expanded, if you want to expand any section initially then fill array with that section.
   

2. In viewDidLoad,

   arrDataSource = [arrSection1, arrSection2,arrSection3] // manage your data with single array.. its more dynamic for future purpose 
   

3. In numberOfSections ,

   func numberOfSections(in tableView: UITableView) -> Int {
       return arrDataSource.count
   }
   

4. Assuming your viewForHeaderInSection is working properly, here give button tag (you already done)

5. On buttonAction,

   // First check in section is selected or not.
   if arrSelectedIndex.contains(sender.tag){
       // IF section is selecetd then remove it from arrSelectedIndex
       let aIndex = arrSelectedIndex.firstIndex(of: sender.tag)
       if let aInt = aIndex {
           arrSelectedIndex.remove(at: aInt)
       }
   }
   else{
       // IF section is not selecetd then add it to arrSelectedIndex
       arrSelectedIndex.append(sender.tag)
   }
   // reload tableview
   tblView.reloadSections([sender.tag], with: .automatic)
   

6. In numberOfRowsInSection,

   return arrSelectedIndex.contains(section) ? (arrDataSource[section] as AnyObject).count : 0
   

Note: This is an idea and best approach, if I forget any condition or you have any doubt then pls comment below..