Swift 4-UITableView ::在正确标题下过滤单元格不起作用

Question

我有一个TableView设置，并且试图在“正确标题”下过滤正确的联系人姓名；标记为（A-Z）。我从API中提取联系人姓名；我在结构中构造数据。目前，我的表格正在复制每个（A-Z）标头下的所有单元格。我的代码在下面。

• 我正在尝试像这样在正确标题下过滤名称。对于标题“ A”，如果ContactName以“ A”开头，则该名称将显示在标题“ A”下，依此类推。

• 在CellforRowat下，我一直在尝试修改下面的行，但没有成功。

    let regionContacts = filteredContacts.map{$0.ContactName? == region}
  

我的结构：

struct userInfo {
  var ContactName : String?
}

TableViewController

var contacts:[userInfo]?
var filteredContacts = [userInfo]()
var Contacts:userInfo?
var contactSectionHeader: [String] = ["A" ,"B" , "C" , "D" , "E" ,"F","G" ,"H" , "I" , "J" , "K" ,"L","M" ,"N" , "O" , "P" , "Q" ,"R","S" ,"T" , "U" , "V" , "W" ,"X", "Y","Z"]

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

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

    //let sorted = contacts?.sorted(by: {return $0.ContactName! < $1.ContactName!})
    let (alpha) = contactSectionHeader[section]
    let count = alpha

    if searchController.isActive && searchController.searchBar.text != "" {

        //return filteredContacts.sorted(by: {return $0.ContactName! < $1.ContactName!}).count

      return filteredContacts.count
}
    else {
       // return (contacts?.sorted(by: {return $0.ContactName! < $1.ContactName!}).count)!
        //return contacts?.sort(by: {$0.ContactName! < $1.ContactName!})


    return contacts?.count ?? 0
    }
}


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

    let (region) = contactSectionHeader[indexPath.section]

    let currentContact: userInfo

    if searchController.isActive && searchController.searchBar.text != "" {            
       let regionContacts = filteredContacts.map{$0.ContactName? == region}
        //let regionContacts = filteredContacts.sorted(by: {return $0.ContactName! < $1.ContactName!})
        currentContact = regionContacts[indexPath.row]
    }
    else {        
      let regionContacts = contacts?.filter{$0.ContactName! == region}
       // let regionContacts = contacts?.sort{return $0.ContactName! < $1.ContactName!}

        currentContact =  (contacts?[indexPath.row])!
    }