如何使用Swift 4.2在TableView中为JSON可编码结构数据创建搜索功能？

Question

My scenario, I created UITableView with below structured JSON data load. I need to add global search for firstname , price , date , title and description . Here, I tried but it didn't worked well for me. Please give me some solution.

For eg: User searched by name or price , date , title and description UITableView should sortout list.

My Codable Struture

struct Welcome: Codable {
    let status: Int
    let message: String
    let ode: Int
    let data: [Datum]
}

struct Datum: Codable {
    let id: Int
    let title, description: String
    let price: Int
    let user: User
    let Appcode: Appcode
    let Appbase: Appbase

    enum CodingKeys: String, CodingKey {
        case id
        case userID = "userid"
        case title, description
        case price
        case Date = "date"
        case location, user
        case appcode = "appcode”
        case appbase = "appbase”
    }
} 

struct Appcode: Codable {
    let card: String
}

struct Appbase: Codable {
    let base: String
}

struct User: Codable {
    let firstname, lastname: String
}

My Tableview Code

    var tableArray = [Datum]()
    var filteredResults = [Datum]()
    lazy var searchBar:UISearchBar = UISearchBar() 
    var isSearching = false

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

        if isSearching {
            return filteredResults.count
        } else {
            return self.tableArray.count
        }
        return 0
    }

My Search bar code

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {

        if searchBar.text == nil || searchBar.text == "" { //
            isSearching = false
            view.endEditing(true)
            tableView.reloadData()
        }
        else {
            isSearching = true
            filteredResults = tableArray.filter({ value -> Bool in
                guard let text =  searchBar.text else { return false}
                return value.description.contains(text) // According to title from JSON
            })
            tableView.reloadData()
        }
    }

Answer 1

In your struct Datum your CodingKeys don't match your property names

The names of the enumeration cases should match the names you've given to the corresponding properties in your type.

If you update your struct like this:

struct Datum: Codable {
    let id: Int
    let title, description: String
    let price: Int
    let user: User
    let appCode: Appcode
    let appBase: Appbase

    enum CodingKeys: String, CodingKey {
        case id
        case title, description
        case price
        case user
        case appCode = "appcode"
        case appBase = "appbase"
    }
}

You can later filter the array of elements like this:

let datum1 = Datum(id: 1, title: "test", description: "test1", price: 10, user: User(firstname: "a", lastname: "b"), appCode: Appcode(card: "app"), appBase: Appbase(base: "base"))

let datum2 = Datum(id: 1, title: "test", description: "test2", price: 10, user: User(firstname: "a", lastname: "b"), appCode: Appcode(card: "app"), appBase: Appbase(base: "base"))

let datum3 = Datum(id: 1, title: "test", description: "test3", price: 10, user: User(firstname: "a", lastname: "b"), appCode: Appcode(card: "app"), appBase: Appbase(base: "base"))

let array = [datum1, datum2, datum3]
array.filter{$0.user.firstname == "a"}
array.filter{$0.description.contains("2")}