How to reorder section in Tableview - ios

Question

I want to reorder section and row. So by default, native section reordering is not possible. So I implemented the section as a row. And reorder section and row. But the problem is when I reorder the section then it takes a row. It will crash the application.
Can you please help me?
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (2) must be equal to the number of rows contained in that section before the update (1), plus or minus the number of rows inserted or deleted from that section (0 inserted, 0 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out). Table view: <UITableView: 0x7f874f026000; frame = (0 59; 393 759); clipsToBounds = YES; autoresize = RM+BM; gestureRecognizers = <NSArray: 0x6000023bde60>; backgroundColor = <UIDynamicSystemColor: 0x60000388b640; name = tableBackgroundColor>; layer = <CALayer: 0x600002df4c60>; contentOffset: {0, 0}; contentSize: {393, 206.66667175292969}; adjustedContentInset: {0, 0, 0, 0}; dataSource: <ReorderTableView.ViewController: 0x7f874c709840>>
class ViewController: UIViewController {
#IBOutlet weak var tblView: UITableView!
var arrSection = [Section]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
tblView.isEditing = true
tblView.dataSource = self
tblView.delegate = self
// register tableviewcell
tblView.register(UINib(nibName:"SectionTableViewCell", bundle: nil), forCellReuseIdentifier: "SectionTableViewCell")
setupView()
}
func setupView(){
let obj = Group(groupName: "Group1")
let sec = Section(sectionName: "Section1", group: [obj])
let sec1 = Section(sectionName: "Section2", group: [obj])
arrSection.append(sec)
arrSection.append(sec1)
tblView.reloadData()
}
}
extension ViewController : UITableViewDelegate,UITableViewDataSource {
func numberOfSections(in tableView: UITableView) -> Int {
return arrSection.count
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if arrSection[section].group?.count ?? 0 > 0 {
let temp = arrSection[section].group?.count ?? 0
return temp + 1
}
else{
return 1
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.row == 0 {
let obj = arrSection[indexPath.section]
let cell = tableView.dequeueReusableCell(withIdentifier: "SectionTableViewCell") as! SectionTableViewCell
cell.lblTitle.text = obj.sectionName
return cell
}
else{
let obj = arrSection[indexPath.section].group?[indexPath.row - 1]
let cell = tableView.dequeueReusableCell(withIdentifier: "SectionTableViewCell") as! SectionTableViewCell
cell.lblTitle.text = obj?.groupName ?? ""
return cell
}
}
func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
return 0
}
func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {
return 0
}
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
return nil
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
if indexPath.row == 0 {
return UITableView.automaticDimension
}else{
return UITableView.automaticDimension
}
}
func tableView(_ tableView: UITableView, moveRowAt sourceIndexPath: IndexPath, to destinationIndexPath: IndexPath) {
tblView.beginUpdates()
let movingItem = self.arrSection[sourceIndexPath.section]
self.arrSection.remove(at: sourceIndexPath.section)
self.arrSection.insert(movingItem, at: destinationIndexPath.section)
tblView.moveSection(sourceIndexPath.section, toSection: destinationIndexPath.section)
tblView.endUpdates()
}
}