swift - 强制小写 swift 类的所有属性键和值

Question

我需要将一个类的所有键及其值转换为小写。例如，

class Person : Encodable {
    var firstName: String
    var lastName: String
     var city: String
}

 var person = Person(firstName: "David", lastName: "Gill", city: 
 "Toronto")
 let encoder = JSONEncoder()
 encoder.keyEncodingStrategy = .convertToLowerCase
 let encoded = try encoder.encode(person)
 print(String(decoding: encoded, as: UTF8.self))

其中 convertToLowerCase 是我在 JSONEncoder.KeyEncodingStrategy 的扩展中添加的方法，用于将键转换为小写。

它打印 - {"city":"Toronto","firstname":"David","lastname":"Gill"}

我需要打印的是 - {"city":"toronto","firstname":"david","lastname":"gill"}

有人可以帮忙吗？

Answer 1

像这样:

struct Person : Codable {
    var firstName: String
    var lastName: String
    var city: String
    enum CodingKeys : String, CodingKey {
        case firstName = "firstname"
        case lastName = "lastname"
        case city
    }
    func encode(to encoder: Encoder) throws {
        var con = encoder.container(keyedBy: CodingKeys.self)
        try! con.encode(self.firstName.lowercased(), forKey: .firstName)
        try! con.encode(self.lastName.lowercased(), forKey: .lastName)
        try! con.encode(self.city.lowercased(), forKey: .city)
    }
}

测试它:

let person = Person(firstName: "David", lastName: "Gill", city:
    "Toronto")
let encoder = JSONEncoder()
let encoded = try encoder.encode(person)
print(String(decoding: encoded, as: UTF8.self))
// {"firstname":"david","lastname":"gill","city":"toronto"}

您可能可以合并您的 .convertToLowerCase 以节省一些工作。