【KakaJSON手册】06_Model转JSON

前面的文章介绍了如何利用KakaJSON进行JSON转Model，从这篇文章开始介绍如何将Model转成JSON

生成JSON和JSONString

struct Car: Convertible {
    var name: String = "Bently"
    var new: Bool = true
    var age: Int = 10
    var area: Float = 0.12345678
    var weight: Double = 0.1234567890123456
    var height: Decimal = 0.123456789012345678901234567890123456789
    var price: NSDecimalNumber = NSDecimalNumber(string: "0.123456789012345678901234567890123456789")
    var minSpeed: Double = 66.66
    var maxSpeed: NSNumber = 77.77
    var capacity: CGFloat = 88.88
    var birthday: Date = Date(timeIntervalSince1970: 1565922866)
    var url: URL? = URL(string: "http://520suanfa.com")
}

let car = Car()
// 将模型实例car转为JSON
let json = car.kk.JSON()
// 也可以调用全局函数`JSON(from:)`
// let json = JSON(from: car)

// 将模型实例car转为JSONString
let jsonString = car.kk.JSONString()
// 也可以调用全局函数`JSONString(from:)`
// let jsonString = JSONString(from: car)
/* {"birthday":1565922866,"new":true,"height":0.123456789012345678901234567890123456789,"weight":0.1234567890123456,"minSpeed":66.66,"price":0.123456789012345678901234567890123456789,"age":10,"name":"Bently","area":0.12345678,"maxSpeed":77.77,"capacity":88.88,"url":"http:\/\/520suanfa.com"} */

// 传入`true`代表生成格式化的JSONString
let jsonString2 = car.kk.JSONString(prettyPrinted: true)
/*
 {
     "height" : 0.123456789012345678901234567890123456789,
     "weight" : 0.1234567890123456,
     "minSpeed" : 66.66,
     "new" : true,
     "maxSpeed" : 77.77,
     "age" : 10,
     "capacity" : 88.88,
     "birthday" : 1565922866,
     "name" : "Bently",
     "price" : 0.123456789012345678901234567890123456789,
     "area" : 0.12345678,
     "url" : "http:\/\/520suanfa.com"
 }
 */

可选类型

// 可选类型的问号?并不会影响JSON或者JSONString的生成

struct Student: Convertible, Equatable {
    var op1: Int? = 10
    var op2: Double?? = 66.66
    var op3: Float??? = 77.77
    var op4: String???? = "Jack"
    var op5: Bool????? = true
    // op6可以是NSArray\Set<CGFloat>\NSSet\NSMutableArray\NSMutableSet类型
    var op6: [CGFloat]?????? = [44.44, 55.55]
}

let jsonString = Student().kk.JSONString(prettyPrinted: true)
/*
{
  "op1" : 10,
  "op4" : "Jack",
  "op2" : 66.66,
  "op5" : true,
  "op6" : [
    44.44,
    55.55
  ],
  "op3" : 77.77
}
*/

Enum

// 遵守了`ConvertibleEnum`协议、带有RawValue的Enum，能自动将RawValue转为JSON

enum Grade: String, ConvertibleEnum {
    case perfect = "A"
    case great = "B"
    case good = "C"
    case bad = "D"
}

// Equatable is only for test cases, is not necessary for Model-To-JSON.
struct Student: Convertible {
    var grade1: Grade = .great
    var grade2: Grade = .bad
}

let jsonString = Student().kk.JSONString()
/* {"grade2":"D","grade1":"B"} */

模型嵌套

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

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

struct Dog: Convertible {
    var name: String = ""
    var age: Int = 0
}

struct Person: Convertible {
    var name: String = "Jack"
    var car: Car? = Car(name: "Bently", price: 106.666)
    var books: [Book]? = [
        Book(name: "Fast C++", price: 666.6),
        Book(name: "Data Structure And Algorithm", price: 666.6),
    ]
    var dogs: [String: Dog]? = [
        "dog0": Dog(name: "Wang", age: 5),
        "dog1": Dog(name: "ErHa", age: 3),
    ]
}

let jsonString = Person().kk.JSONString(prettyPrinted: true)
/*
{
  "dogs" : {
    "dog0" : {
      "name" : "Wang",
      "age" : 5
    },
    "dog1" : {
      "name" : "ErHa",
      "age" : 3
    }
  },
  "books" : [
    {
      "price" : 666.6,
      "name" : "Fast C++"
    },
    {
      "name" : "Data Structure And Algorithm",
      "price" : 666.6
    }
  ],
  "name" : "Jack",
  "car" : {
    "price" : 106.666,
    "name" : "Bently"
  }
}
*/

Any

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

struct Dog: Convertible {
    var name: String = ""
    var age: Int = 0
}

struct Person: Convertible {
    // `books`也可以是NSArray\NSMutableArray
    var books: [Any]? = [
        Book(name: "Fast C++", price: 666.6),
        Book(name: "Data Structure And Algorithm", price: 666.6),
    ]
    
    // `books`也可以是NSDictionary\NSMutableDictionary
    var dogs: [String: Any]? = [
        "dog0": Dog(name: "Wang", age: 5),
        "dog1": Dog(name: "ErHa", age: 3),
    ]
}

/*
{
  "dogs" : {
    "dog1" : {
      "age" : 3,
      "name" : "ErHa"
    },
    "dog0" : {
      "age" : 5,
      "name" : "Wang"
    }
  },
  "books" : [
    {
      "name" : "Fast C++",
      "price" : 666.6
    },
    {
      "price" : 1666.6,
      "name" : "Data Structure And Algorithm"
    }
  ]
}
*/

Model数组

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

// `models`也可以是NSArray\NSMutableArray
let models = [
    Car(name: "BMW", price: 100.0),
    Car(name: "Audi", price: 70.0),
    Car(name: "Bently", price: 300.0)
]

let jsonString = models.kk.JSONString(prettyPrinted: true)
// 也可以使用全局函数`JSONString(from:prettyPrinted:)`
// let jsonString = JSONString(from: models, prettyPrinted: true)
/*
[
  {
    "name" : "BMW",
    "price" : 100
  },
  {
    "price" : 70,
    "name" : "Audi"
  },
  {
    "price" : 300,
    "name" : "Bently"
  }
]
*/

Model Set

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

let models: Set<Car> = [
    Car(name: "BMW", price: 100.0),
    Car(name: "Audi", price: 70.0),
    Car(name: "Bently", price: 300.0)
]

let jsonString = models.kk.JSONString(prettyPrinted: true)
/*
[
  {
    "price" : 70,
    "name" : "Audi"
  },
  {
    "price" : 300,
    "name" : "Bently"
  },
  {
    "name" : "BMW",
    "price" : 100
  }
]
*/

Key处理

struct Dog: Convertible {
    var nickName: String = "Wang"
    var price: Double = 100.6
    
    // 可以通过实现`kk_JSONKey`方法自定义最终生成JSON的key
    func kk_JSONKey(from property: Property) -> JSONPropertyKey {
        switch property.name {
        case "nickName": return "_nick_name_"
        default: return property.name
        }
    }
}

let jsonString = Dog().kk.JSONString()
/* {"price":100.6,"_nick_name_":"Wang"} */

• kk_JSONKey也支持ConvertibleConfig配置，用法类似于kk_modelKey，参考第三篇文章

值过滤

private let dateFmt: DateFormatter = {
    let fmt = DateFormatter()
    fmt.dateFormat = "yyyy-MM-dd HH:mm:ss"
    return fmt
}()

struct Student: Convertible {
    var birthday: Date?
    
    // 可以通过实现`kk_JSONValue`方法自定义最终生成JSON的value
    func kk_JSONValue(from modelValue: Any?,
                      property: Property) -> Any? {
        if property.name != "birthday" { return modelValue }
        // 将`birthday`格式化成字符串后放入JSON
        return birthday.flatMap(dateFmt.string)
    }
}

let time = "2019-08-13 12:52:51"
let date = dateFmt.date(from: time)
let student = Student(birthday: date)
let jsonString = student.kk.JSONString()
/* {"birthday":"2019-08-13 12:52:51"} */

• kk_JSONValue也支持ConvertibleConfig配置，用法类似于kk_modelKey，参考第三篇文章

监听

struct Car: Convertible {
    var name: String = "Bently"
    var age: Int = 10
    
    // 当Model即将开始转换为JSON时调用
    func kk_willConvertToJSON() {
        print("Car - kk_willConvertToJSON")
    }

    // 当Model转换JSON完毕时调用   
    func kk_didConvertToJSON(json: JSONObject?) {
        print("Car - kk_didConvertToJSON", json as Any)
    }
}

【KakaJSON手册】06_Model转JSON

原文：https://www.cnblogs.com/mjios/p/11370361.html