如何快速从 JSON 字符串中获取键值

Question

I have a JSON string value how to get the key value from the json using swift code?

{ 
 "user":{  "id":"74d93200-2ed2-437c-976f-83710eaea923","firstName":"dev","lastName":"che", "username":"dev_che"}}

From this how to get the "username" value using swift code?

Answer 1

first define User struct

struct UserModel: Codable {
    let user: User?
}

struct User: Codable {
    let id, firstName, lastName, username: String?
}

then decode your model from json

let userData =
            "{\"user\":{\"id\":\"74d93200-2ed2-437c-976f-83710eaea923\",\"firstName\":\"dev\",\"lastName\":\"che\", \"username\":\"dev_che\"}}"
        let data = userData.data(using: .utf8)!
        let userModel = try? JSONDecoder().decode(UserModel.self, from: data)

then you can use it this way :

userModel.username