swift4中tableview内的可扩展下拉菜单

Question

我在 swift4 的 tableview 中尝试了可扩展的下拉菜单，但我下面的代码没有用。如果我将自定义模型类更改为 String 它正在工作。我的要求在自定义模型类下面使用。请检查我的以下代码。

class ExpandViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, ExpandableHeaderViewDelegate {
        var empDetails = [EmpWorking]()
        var hiredDetails = [Hired]()

        @IBOutlet weak var tableView: UITableView!
        var sections = [SectionData]()

        override func viewDidLoad() {
            super.viewDidLoad()
            loadData()
            // Do any additional setup after loading the view.
        }

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

        func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
            return sections[section].emp.count
        }

        func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
            return 44
        }
        func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
            if(sections[indexPath.section].expanded){
                return 80
            }
            else{
                return 0
            }
        }
        func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {
            return 2
        }

        func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
            var header = ExpandableHeaderView()
            header.customInit(title: sections[section].genre, section: section, delegate: self)
            return header
        }

        func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
            let cell = tableView.dequeueReusableCell(withIdentifier: "labelCell", for: indexPath) as! expandDataCell
            cell.lbl1.text = "\(sections[indexPath.section].emp![indexPath.item].name)"
            cell.lbl2.text = "\(sections[indexPath.section].emp![indexPath.item].dept)"
            return cell as expandDataCell
        }

        func toggleSection(header: ExpandableHeaderView, section: Int) {
            sections[section].expanded = !sections[section].expanded
            tableView.beginUpdates()
            for i in 0 ..< sections[section].emp.count
            {
                tableView.reloadRows(at: [IndexPath(row: i, section: section)], with: .automatic)
            }
            tableView.endUpdates()
        }

    func loadData(){
        let url = "http://www.json-generator.com/api/json/get/ccgFfBFWqa?indent=2"
        guard let resourceString = URL(string: url) else{return}
        let decoder = JSONDecoder()
        URLSession.shared.dataTask(with: resourceString) { (data, response, err) in
            guard let data = data else{return}
            do{
            let expandData = try decoder.decode([ExpandModel].self, from: data)
                print("Expand Data:\(expandData)")
                for i in expandData[0].emp_working{
                    print("i=\(i)")
                    self.empDetails.append(i)
                }
                for j in expandData[0].emp_recent_hired{
                    self.hiredDetails.append(j)
                }

                DispatchQueue.main.async {
//                    self.sections = [SectionData(genre: "Employee Working", emp: self.empDetails, expanded: false),
//                    SectionData(genre: "Employee Hired", emp: self.hiredDetails, expanded: false)
//                    ]
                    self.tableView.reloadData()
                }
            }
            catch let jsonErr{
                print("Expand Data Err:\(jsonErr)")

            }
        }.resume()

    }

}

struct ExpandModel: Codable{
    let emp_working: [EmpWorking]
    let emp_recent_hired: [Hired]
}

struct EmpWorking: Codable{
    let dept: String
    let name: String
}

struct Hired: Codable {
    let name: String
    let qualification: String
}


struct SectionData {
        var genre: String!
        var emp: [EmpWorking]!
        var expanded: Bool!

        init(genre: String, emp: [EmpWorking] = [], expanded: Bool)
        {
            self.genre = genre
            self.emp = emp
            self.expanded = expanded
        }
}

需要的输出：

员工工作 > 雇用员工 >

如果点击员工工作，则会显示以下输出：

员工工作 V 约翰 网络

亚历克斯 手机

Answer 1

storyBoard design

在上图中，您可以看到动态数据将出现两个标签。在每个单元格索引上单击它将展开单元格，如下面的屏幕所示。

simple view appear like this

After expend a cell it will appear like this

所以您只需要执行以下步骤：- 首先创建一个变量来存储前的 didselectrowat 索引：-

var int_row = Int()
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath){
        int_row = indexPath.row . // save the index path
        yourTableViewName.reloadData() // reload the table
} 

func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat
{
     if int_row == indexPath.row { // when you tap on cell then it will expend 
     the cell
        return UITableView.automaticDimension
    } else {
        return 48 // at this time only show your uppar labal only 
    }
   }