Swift4的Codable探究

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在Swift4中，编码和解码引入了Encodable和Decodable这两个协议，而Codable是Encodable和Decodable的集合。在Swift中，Enum、Struct和Class都支持Codable。

一个简单的例子

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enum Gender:String, Codable {
    case Male = "Male"
    case Female = "Female"
}
class User: Codable {
    let name :  String
    let age: Int
    let gender: Gender
    init(name: String, age: Int, gender: Gender) {
        (self.name, self.age, self.gender) = (name, age, gender)
    }
}
let userJsonString = """
{
"name": "Cook",
"age" : 58,
"gender": "Male"
}
"""

if let userJsonData = userJsonString.data(using: .utf8){
    let userDecode = try? JSONDecoder().decode(User.self, from: userJsonData)
    print(userDecode!)
}
let userEncode = User(name: "Cook", age: 58, gender: Gender.Male)
let userEncodeData = try? JSONEncoder().encode(userEncode)
print(userEncodeData as Any)