json - 使用 JSON 将 ID 转换为用户名

Question

我有两个 JSON 调用函数，用于获取客户数据和发票数据。在我的客户 JSON 响应中，我有 ID 和名称等。在我的发票响应中，我有客户 ID。

我需要从发票中获取客户 ID 并转换为客户名称字符串。

在我的ClientsViewController中，我创建了一个名为downloadClientsJSON的函数

func downloadClientsJSON(completed: @escaping () -> ()) {
    let url = URL(string: "http://ex.com/app/api/clientList/get")

    URLSession.shared.dataTask(with: url!) { (data, response, error) in
        if error == nil {
            do {
                self.clients.removeAll()
                self.clients = try JSONDecoder().decode([ClientsList].self, from: data!)

                DispatchQueue.main.async {
                    completed()
                }
            } catch {
                print ("Error")
            }
        }
    }.resume()
}

这是 ClientsList 结构:

import Foundation

struct ClientsList:Decodable {
   let name: String
   let vatNumber: String
   let address: String
   let cap: String
   let city: String
   let prov: String
   let tel: String
   let email: String
}

这是 JSON 响应:

[{"id":1,"name":"DemoClient","vatNumber":"010101010101","address":"Demo Address, 1","cap":"01010","city":"DemoCity","prov":"DP","tel":"555-1112223","email":"demo@example.com"}]

在我的 InvoiceViewController 中，我创建了一个名为 downloadInvoicesJSON

的函数

func downloadJSON(completed: @escaping () -> ()) {
    let url = URL(string: "http://ex.com/app/api/invoiceList/get")

    URLSession.shared.dataTask(with: url!) { (data, response, error) in
        if error == nil {
            do {
                self.invoices.removeAll()
                self.invoices = try JSONDecoder().decode([InvoiceList].self, from: data!)

                DispatchQueue.main.async {
                    completed()
                }
            } catch {
                print (error)
            }
        }
    }.resume()
}

这是InvoiceList结构:

import Foundation

struct InvoiceList:Decodable {
    let id: NSInteger
    let date: String
    let expiration: String
    let client: NSInteger
    let status: NSInteger
    let lines: String
    let total: Float
}

这是 JSON 响应:

[{"id":1,"date":"01-01-2018","expiration":"01-01-2018","client":3,"status":3,"lines":"1:1","total":700},{"id":2,"date":"30-01-2018","expiration":"30-01-2018","client":4,"status":2,"lines":"1:1","total":100},{"id":3,"date":"15-02-2018","expiration":"15-02-2018","client":3,"status":3,"lines":"1:1","total":700}]

该函数应位于 InvoiceViewController 中。我如何得到结果？

Answer 1

您从http://ex.com/app/api/clientList/get获取的JSON对象应该是一个数组，并且参数键应该与ClientsList<的属性名称相同.

struct ClientsList: Decodable {
    let name: String
    let vatNumber: String
    let address: String
    let cap: String
    let city: String
    let prov: String
    let tel: String
    let email: String
}

如果您不确定是否会收到响应 JSON 中的所有属性，请将该特定属性设为可选。像:

struct ClientsList: Decodable {
    let name: String
    let vatNumber: String
    let address: String
    let cap: String
    let city: String? // Not sure about receiving this property
    let prov: String? // Not sure about receiving this property
    let tel: String? // Not sure about receiving this property
    let email: String
}

对于 http://ex.com/app/api/invoiceList/get 和 InvoiceList，您需要遵循相同的模式。