ios - 使用 UserDefault 快速存储和检索数组数据

Question

在我的场景中，我需要将 array 值存储到 UserDefault 中并检索相同的数据。当用户再次打开该特定的 View Controller 时，检索数据需要加载到同一个数组中。下面是我正在尝试的代码。我不知道如何以正确的方式存储和检索下面的数组输出值到UserDefaults中。请帮我解决这个问题。

将数据存储到数组

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        self.tableView.deselectRow(at: indexPath, animated: true)
        let item = searching ? filteredData[indexPath.row] : membersData[indexPath.row]

        if let cell = tableView.cellForRow(at: indexPath) {
            if cell.accessoryType == .checkmark {
                cell.accessoryType = .none

                // UnCheckmark cell JSON data Remove from array
                self.selectedRows = selectedRows.filter{$0 != indexPath.row}
                self.selectedValues.remove(item) // Here Data Removing Into Array

            } else {
                cell.accessoryType = .checkmark

                // Checkmark selected data Insert into array
                self.selectedRows.append(indexPath.row) //select
                self.selectedValues.insert(item) // Here Data Storing Into Array
            }
        }        
    }

将数组数据保存到 UserDefault

@IBAction func doneAction(_ sender: Any) {

        // Selected Row Index Store
        UserDefaults.standard.set(selectedRows, forKey: "SelectedIndexes")
        // Here need to store Selected values
        self.dismiss(animated: true, completion: nil)
    }

将 UserDefault 存储的数据重新加载到同一数组中 (viewDidLoad)

    self.selectedRows = UserDefaults.standard.value(forKey: "SelectedIndexes") as? [Int] ?? []
// Here how to retrieve SelectionValue and Load into `selectedValues` array

可编码

// MARK: - ListData
struct ListData: Codable, Hashable {
    let userid: String?
    let firstname, designation: String?
    let profileimage: String?
    var isSelected = false

    private enum CodingKeys : String, CodingKey {
        case userid, firstname, designation, profileimage
    }
}

数组数据

SELECT VALUE:[ListData(userid: Optional("1"), firstname: Optional(“abc”), designation: Optional(“English”), profileimage: Optional("url")), ListData(userid: Optional(“2”), firstname: Optional(“def”), designation: Optional("Digital"), profileimage: Optional("url"))] SELECT ROW:[0, 1]

Answer 1

如果您想存储在 UserDefault 中，尽管不建议这样做。

var selectedValues: [Any] = [["id": 1, "name": "Adam"]]
selectedValues.append(["id": 2, "name": "Eve"])
UserDefaults.standard.set(selectedValues, forKey: "SelectedValues")
let result = UserDefaults.standard.array(forKey: "SelectedValues") ?? []

print(result)


Output : [{
  id = 1;
  name = Adam;
}, {
  id = 2;
  name = Eve;
}]