TableView Section Index not Display - ios

Question

I've implemented tableView section index in my app.
TableView Section Index shows when data of tableView is local, When i get data from api call at that time tableview section index hides.
I don't understand why this happening
Here is my tableview section index code:
var sectionArray = UILocalizedIndexedCollation.current().sectionIndexTitles // section Array
func numberOfSections(in tableView: UITableView) -> Int
{
return memberStructList.count // this is structList
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return memberStructList[section].memberArray.count
}
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView?
{
let cell = tableView.dequeueReusableCell(withIdentifier: "MembersHeaderTVCell") as! MembersTVCell
cell.lblSectionHeader.text = memberStructList[section].sectionName
return cell
}
func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat
{
return 40
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCell(withIdentifier: "MembersTVCell") as! MembersTVCell
let sectionRows = memberStructList[indexPath.section]
let row = sectionRows.memberArray[indexPath.row]
cell.lblMemberName.text = row.first_name
return cell
}
func sectionIndexTitles(for tableView: UITableView) -> [String]?
{
return sectionArray
}
func tableView(_ tableView: UITableView,
sectionForSectionIndexTitle title: String,
at index: Int) -> Int
{
if memberStructList.contains(where: {$0.sectionName == title}),
let sectionIndex = memberStructList.firstIndex(where: {$0.sectionName == title})
{
return sectionIndex
}
else
{
return NSNotFound
}
}
And Here is Structure Code:
struct MemberStruct
{
var sectionName : String
var memberArray : [MemberModel] = []
}
Here is My Webservice Code and MVCServer is My Webservice Function
MVCServer().serviceRequestWithURL(reqMethod: .get, withUrl: strUrl, withParam: [:], diplayHud: true, includeToken: true) { (ResponseCode, Response) in
if ResponseCode == 1
{
if let array = Response.value(forKeyPath: "payload.data") as? NSArray
{
var memberArray = MemberModel.modelsFromDictionaryArray(array: array)
memberArray.forEach({$0.first_name = $0.first_name.capitalized + " " + $0.last_name.capitalized})
memberArray.sort(){$0.first_name < $1.first_name}
let groupedDictionary = Dictionary(grouping: memberArray, by: {String($0.first_name.capitalized.prefix(1))})
let keys = groupedDictionary.keys.sorted()
self.memberStructList = keys.map({ MemberStruct(sectionName: $0, memberArray: groupedDictionary[$0]!)})
self.tblMembers.reloadData()
}
}
else
{
Utility.showToast(messageData: Response)
}
}

Answer 1

If everything is ok with your local data so, I guess You did not follow the priority.
You must set your tableview Delegate and Datasource after receiving the response from webservice.
self.tableview.dataSource = self
self.tableview.delegate = self
or you should reload your tableview again:
self.tableview.reloadData()

Answer 2

Have you tried this instead of using TableViewCell on the section header?
override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let view = UIView(frame: CGRectMake(0, 0, tableView.frame.size.width, 18))
let label = UILabel(frame: CGRectMake(10, 5, tableView.frame.size.width, 18))
label.font = UIFont.systemFontOfSize(14)
label.text = memberStructList[section].sectionName
view.addSubview(label)
view.backgroundColor = UIColor.grayColor() // Set your background color
return view
}