在Xcode中构建项目时如何从XML或Json生成swift类或对象

Question

I have a json file with the format like this:

    {
    "id":"nav_grap",
    "startDestination":0,

    "navigators":[

        {
            "id":0,
            "groupsId":"0",
            "controller_name":"LoginScreen",
            "titleVi":"login_screen",
            "titleEn":"Dang nhap",
            "actions":[{
            "name":"idaction_loginScreen_to_homeScreen",
            "destination":1

            }]},
       {
            "id":1,
            "groupsId":"1",
            "controller_name":"HomeScreen",
            "titleVi":"Cong viec",
            "titleEn":"Jobs",
            "actions":[]
       },
       {
            "id":2,
            "groupsId":"2",
            "controller_name":"NewsScreen",
            "titleVi":"Tin tuc",
            "titleEn":"News",
            "actions":[]
       },
       {
            "id":3,
            "groupsId":"3",
            "controller_name":"BiometricsScreen",
            "titleVi":"Sin trac hoc",
            "titleEn":"News",
            "actions":[]
       },
       {
            "id":4,
            "groupsId":"4",
            "controller_name":"ContactScreen",
            "titleVi":"Tin tuc",
            "titleEn":"News",
            "actions":[]
       }]
}.       

I want to generate a class or object base on the format of this json file when I build my project so after project built I would have a object with properties like this:

    class ScreenConfig : Decodable{

       var id : String
       var startDestination : Int
       var navigators : [Navigator] = []

       init(id : String, startDestination : Int, navigator : [Navigator]) {
          self.id = id
          self.startDestination = startDestination
          self.navigators = navigator
         }

       init() {
                self.id = ""
                self.startDestination = 0
                self.navigators = []
              }
      }.       

So,could anyone please tell me how can I archive this? thanks.

Answer 1

I guess you are finding quicktype-xcode

quicktype-xcode: Creating models base on API JSON responses

To do it manually, you can use Sourcery or SwiftGen , which can automate daily development processes

Answer 2

You need to write a Xcode plugin for generating JSON to Swift code.

So you should build extensions to the source editor in Xcode using XcodeKit.

Source editor extensions can read and modify the contents of a source file, as well as read and modify the current text selection within the editor.

---

struct ScreenConfig: Decodable{

   let id : String
   let startDestination : Int
   let navigators : [Navigator]

}

struct Navigator: Decodable {
    let id: Int
    let groupsId: String
    let controller_name : String


    let titleVi: String
    let titleEn: String
    let actions: [Action]?

}



struct Action: Decodable {
    let name: String
    let destination: Int

}

Test Case:

you have a json file named "one.json" in your project bundle, which is configured with your data above

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        if let src = Bundle.main.url(forResource: "one", withExtension: "json"){
            do {
                let data = try Data(contentsOf: src)
                let decoder = JSONDecoder()
                let model = try decoder.decode(ScreenConfig.self, from: data)
                print(model.navigators.first?.controller_name ?? "ha ha")

            } catch let error {
                print(error.localizedDescription)
            }
        }
    }
}

Answer 3

Using the http://www.jsoncafe.com

struct TestingTest : Codable {

        let id : String?
        let navigators : [TestingNavigator]?
        let startDestination : Int?

        enum CodingKeys: String, CodingKey {
                case id = "id"
                case navigators = "navigators"
                case startDestination = "startDestination"
        }
        init(from decoder: Decoder) throws {
                let values = try decoder.container(keyedBy: CodingKeys.self)
                id = try values.decodeIfPresent(String.self, forKey: .id)
                navigators = try values.decodeIfPresent([TestingNavigator].self, forKey: .navigators)
                startDestination = try values.decodeIfPresent(Int.self, forKey: .startDestination)
        }
}


struct TestingNavigator : Codable {

        let actions : [AnyObject]?
        let controllerName : String?
        let groupsId : String?
        let id : Int?
        let titleEn : String?
        let titleVi : String?

        enum CodingKeys: String, CodingKey {
                case actions = "actions"
                case controllerName = "controller_name"
                case groupsId = "groupsId"
                case id = "id"
                case titleEn = "titleEn"
                case titleVi = "titleVi"
        }

        init(from decoder: Decoder) throws {
                let values = try decoder.container(keyedBy: CodingKeys.self)
                actions = try values.decodeIfPresent([AnyObject].self, forKey: .actions)
                controllerName = try values.decodeIfPresent(String.self, forKey: .controllerName)
                groupsId = try values.decodeIfPresent(String.self, forKey: .groupsId)
                id = try values.decodeIfPresent(Int.self, forKey: .id)
                titleEn = try values.decodeIfPresent(String.self, forKey: .titleEn)
                titleVi = try values.decodeIfPresent(String.self, forKey: .titleVi)
        }
}