Tableview inside another table view with dynamic height for inner tableview - uitableview

Question

im new to iOS development.The thing im trying to achieve is to have a tableView inside another tableView and must have selection for items in that inner tableView. There are some problems facing when i implemented this.
i need to have a dynamic table view height (ie,for the first time loading ,inner table view should only have a height to show 3 cells and on clicking a show more button in the outer tableview cell ,the outer table view cell will expand and show the remaining cells in the inner table view)
On selecting a cell in the inner tableView, the same cell in the inner table view cell all other cells are also getting selected.
Im attaching the code i did and image of what im trying to achieve.
Please click here to see the desing i want to achieve
Outer Main Table View methods
extension Explore:UITableViewDelegate,UITableViewDataSource{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 13
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = exploreTableView.dequeueReusableCell(withIdentifier: "exploreCell", for: indexPath) as! ExploreAlbumPosting
if isExpanded{
cell.showMoreBtn.setTitle("Show Less", for: .normal)
cell.showMoreBtn.setImage(#imageLiteral(resourceName: "ic_arrow_drop_up"), for: .normal)
}
else{
cell.showMoreBtn.setTitle("Show More", for: .normal)
cell.showMoreBtn.setImage(#imageLiteral(resourceName: "ic_arrow_drop_down"), for: .normal)
}
cell.showMoreBtn.addTarget(self, action: #selector(showMoreBtnTapped(sender:)), for: .touchUpInside)
cell.showMoreBtn.tag = indexPath.row
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
if isExpanded && selectedIndex == indexPath{
return 180 * numberOfRowsInInnerTableView
}
return UITableViewAutomaticDimension
}
func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
return 215
}
}
show More Btn Tapp action
func showMoreBtnTapped(sender:UIButton){
let row = sender.tag
self.selectedIndex = IndexPath(item: row, section: 0)
isExpanded = !isExpanded
self.exploreTableView.reloadRows(at: [selectedIndex!], with: .automatic)
self.exploreTableView.scrollToRow(at: selectedIndex!, at:UITableViewScrollPosition.middle, animated: true)
}
inner Table view Methods ( This is extended to the customcell class - UITableViewCell of outer table view)
extension ExploreAlbumPosting:UITableViewDelegate,UITableViewDataSource{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 8
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = innerAlbumTableView.dequeueReusableCell(withIdentifier: "ExploreAlbumInnerCell", for: indexPath)
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
return 92
}
}
Please help me.Thank you