将tableview选择的数据存储到具有键值的数组中

Question

我是swift的新手，并且我已经创建了tableview select all rows功能，所以select deselect对我来说很好用，但是现在我想要在tableview中选择数据，因此我尝试使用Encodable创建结构模型，如下所示

class QuotationListDataModel: Encodable{
    var id: String?
    var quantity: String?
    var margin: String?
    var created_date: String?
    var part_number: String?
    var total_price: String?
    var freight: String?
    var fk_customer_id: String?

    init(id: String?,quantity: String?,margin: String?,created_date: String?,part_number: String,total_price: String,freight: String,fk_customer_id: String) {
        self.id = id
        self.quantity = quantity
        self.margin = margin
        self.created_date = created_date
        self.part_number = part_number
        self.total_price = total_price
        self.freight = freight
        self.fk_customer_id = fk_customer_id
    }
}

我想像下面这样放出来

[
  {
   margin: 20,
   quantity: 10
   part_number: 15
   total_price: 1500
   freight: 100
  },
  {
   margin: 20,
   quantity: 10
   part_number: 15
   total_price: 1500
   freight: 100
  }
]


@IBAction func btnSelectAllTapped(_ sender: UIButton) {
    if btnSelectAll.titleLabel?.text == "Select All"{
        self.btnSelectAll.setTitle("DeSelect All", for: .normal)
        self.btnSelectAll.backgroundColor = UIColor(red: 119/255, green: 119/255, blue: 119/255, alpha: 1)
        self.btnShare.isHidden = false
        self.arrSelectedIds = quotationSeelctedData.map({ (quotation: QuotationListDataModel) -> String in quotation.id! }) 
         //Here when user select all i want all data into array
        self.tblListView.reloadData()
    }else{
        self.isSelectAll = false
        btnSelectAll.setTitle("Select All", for: .normal)
        btnSelectAll.backgroundColor = UIColor(red: 0/255, green: 175/255, blue: 239/255, alpha: 1)
        self.btnShare.isHidden = true
        self.arrSelectedIds.removeAll()
        print(arrSelectedIds)
        self.tblListView.reloadData()
    }
}

所以我想要像这样的选定数据，任何人都可以帮我解决它

Answer 1

您可以在didSelect委托中创建类似var QuotationList = [QuotationListDataModel]()的数组，您可以将模型添加到列表中，例如

QuotationList = allDataArray[indexPath.row]

选定的数据将被添加到您的阵列中

Answer 2

尝试这个：

let encoder = JSONEncoder()
encoder.outputFormatting = .prettyPrinted

do {
    let jsonData = try encoder.encode(MYARRAY)
    if let jsonString = String.init(data: jsonData, encoding: .utf8) {
        // That's your JSON string...
        print(jsonString)
    }
} catch {
    print("the encoding failed")
}

无论如何，您都需要通过ID来获取项目...更好，更快的解决方案是使用所选单元格的索引路径，并将其从数据源中提取出来。

编辑：如Joakim Danielson所述，添加所需的CodingKeys。

Answer 3

要对行进行编码，您需要向类添加一个枚举，该枚举包含要成为编码数据一部分的属性

  enum CodingKeys: String, CodingKey {
      case margin, quantity, part_number, total_price, freight
  }

然后可以像这样编码

do {
    let data = try JSONEncoder().encode(arr)                                 
} catch {
    print(error)
}

需要考虑一些问题，为什么所有类型都是String类型的属性，为什么都是可选的？