【KakaJSONマニュアル】05_JSON回転モデル_05_ダイナミックモデル

3216 ワード

前の記事では、サーバが返すフィールドのコンテンツタイプが不確定な場合があります.

当時与えられた解決策はkj_modelValueまたはkj_didConvertToModelの方法を実現し、実際のニーズに応じてJSONの解析ロジック

をカスタマイズすることである.

不確定な内容がモデル化される場合、KakaJSONはより簡単な実装案

を有する.
例を挙げる

struct Book: Convertible {
    var name: String = ""
    var price: Double = 0.0
}

struct Car: Convertible {
    var name: String = ""
    var price: Double = 0.0
}

struct Pig: Convertible {
    var name: String = ""
    var height: Double = 0.0
}

struct Dog: Convertible {
    var name: String = ""
    var weight: Double = 0.0
}

struct Person: Convertible {
    var name: String = ""
    var pet: Any?

    //    `NSArray`、`NSMutableArray`  
    var toys: [Any]?

    //    `NSDictionary`、`NSMutableDictionary`  
    var foods: [String: Any]?

    func kj_modelType(from jsonValue: Any?, _ property: Property) -> Convertible.Type? {
        switch property.name {
        case "toys": return Car.self  // `toys`    `Car`  
        case "foods": return Book.self  // `foods`    `Book`  
        case "pet":
            if let pet = jsonValue as? [String: Any], let _ = pet["height"] {
                //   `pet`   `jsonValue`    ，   `height`  key，   `Pig`  
                return Pig.self
            }
            //  `jsonValue`  `Dog`     `pet`  
            return Dog.self
        default: return nil
        }
    }
}

//     
let name = "Jack"
let dog = (name: "Wang", weight: 109.5)
let pig = (name: "Keke", height: 1.55)
let books = [
    (name: "Fast C++", price: 666.0),
    (name: "Data Structure And Algorithm", price: 1666.0)
]
let cars = [
    (name: "Benz", price: 100.5),
    (name: "Bently", price: 300.6)
]

// JSON  
let json: [String: Any] = [
    "name": name,
    "pet": ["name": dog.name, "weight": dog.weight],
    // "pet": ["name": pig.name, "height": pig.height],
    "toys": [
        ["name": cars[0].name, "price": cars[0].price],
        ["name": cars[1].name, "price": cars[1].price]
    ],
    "foods": [
        "food0": ["name": books[0].name, "price": books[0].price],
        "food1": ["name": books[1].name, "price": books[1].price]
    ]
]

let person = json.kj.model(Person.self)
XCTAssert(person.name == name)

if let pet = person.pet as? Dog {
    XCTAssert(pet.name == dog.name)
    XCTAssert(pet.weight == dog.weight)
} else if let pet = person.pet as? Pig {
    XCTAssert(pet.name == pig.name)
    XCTAssert(pet.height == pig.height)
}

let toy0 = person.toys?[0] as? Car
XCTAssert(toy0?.name == cars[0].name)
XCTAssert(toy0?.price == cars[0].price)

let toy1 = person.toys?[1] as? Car
XCTAssert(toy1?.name == cars[1].name)
XCTAssert(toy1?.price == cars[1].price)

let food0 = person.foods?["food0"] as? Book
XCTAssert(food0?.name == books[0].name)
XCTAssert(food0?.price == books[0].price)

let food1 = person.foods?["food1"] as? Book
XCTAssert(food1?.name == books[1].name)
XCTAssert(food1?.price == books[1].price)

Extjs独学ノート--gridpanel

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