從Swift中的Json模型中獲取特定值的陣列

我想要一個僅包含以下模型類中的用戶名的陣列：

struct MyModel: Codable {
    let status: Int?
    let message: String?
    let data: [MyModelClass]?
}

struct MyModelClass: Codable {
    let userID, userName, email, emailCode: String?
    let phone, password: String?
    let image: String?
    let dreamInfo: String?

    enum CodingKeys: String, CodingKey {
        case userID = "user_id"
        case userName = "user_name"
        case email
        case emailCode = "email_code"
        case phone, password, image
        case dreamInfo = "dream_info"
    }
} 

我想要一個只有userNames的陣列。如何快速做到這一點？

我的模型回應如下：

{
    "status": 1,
    "message": "user found ",
    "data": [
        {
            "user_id": "1",
            "user_name": "ali",
            "email": "[email protected]",
            "email_code": "0",
            "phone": "0",
            "password": "da39a3ee5e6b4b0d3255bfef95601890afd80709",
            "image": "",
            "dream_info": "this is my dream"
        },
        {
            "user_id": "2",
            "user_name": "raza",
            "email": "[email protected]",
            "email_code": "0",
            "phone": "0",
            "password": "da39a3ee5e6b4b0d3255bfef95601890afd80709",
            "image": "",
            "dream_info": "this is my dream"
        },
        {
            "user_id": "3",
            "user_name": "usman",
            "email": "[email protected]",
            "email_code": "0",
            "phone": "0",
            "password": "da39a3ee5e6b4b0d3255bfef95601890afd80709",
            "image": "",
            "dream_info": "this is my dream"
        },
        {
            "user_id": "4",
            "user_name": "haroon",
            "email": "[email protected]",
            "email_code": "0",
            "phone": "0",
            "password": "da39a3ee5e6b4b0d3255bfef95601890afd80709",
            "image": "",
            "dream_info": "this is my dream"
        }
    ]
}

我只想要這個模型的用戶名。這是我想要的輸出：

var myArray = ["ali", "raza", "usman", "haroon"]

如果模型類中有 10 個值，那么我需要myArray來擁有所有 10 個用戶名。

uj5u.com熱心網友回復：

對 Kudos 答案的簡單修改

var arr = []
for item in data {
    arr.append(item.Username)
}
debugPrint(arr)

uj5u.com熱心網友回復：

這是作業代碼，在操場上測驗

import Foundation

let json: String = """
{
    "status": 1,
    "message": "user found ",
    "data": [
        {
            "user_id": "1",
            "user_name": "ali",
            "email": "[email protected]",
            "email_code": "0",
            "phone": "0",
            "password": "da39a3ee5e6b4b0d3255bfef95601890afd80709",
            "image": "",
            "dream_info": "this is my dream"
        },
        {
            "user_id": "2",
            "user_name": "raza",
            "email": "[email protected]",
            "email_code": "0",
            "phone": "0",
            "password": "da39a3ee5e6b4b0d3255bfef95601890afd80709",
            "image": "",
            "dream_info": "this is my dream"
        },
        {
            "user_id": "3",
            "user_name": "usman",
            "email": "[email protected]",
            "email_code": "0",
            "phone": "0",
            "password": "da39a3ee5e6b4b0d3255bfef95601890afd80709",
            "image": "",
            "dream_info": "this is my dream"
        },
        {
            "user_id": "4",
            "user_name": "haroon",
            "email": "[email protected]",
            "email_code": "0",
            "phone": "0",
            "password": "da39a3ee5e6b4b0d3255bfef95601890afd80709",
            "image": "",
            "dream_info": "this is my dream"
        }
    ]
}
"""

struct MyModel: Codable {
    let status: Int?
    let message: String?
    let data: [MyModelClass]?
}

struct MyModelClass: Codable {
    let userID, userName, email, emailCode: String?
    let phone, password: String?
    let image: String?
    let dreamInfo: String?

    enum CodingKeys: String, CodingKey {
        case userID = "user_id"
        case userName = "user_name"
        case email
        case emailCode = "email_code"
        case phone, password, image
        case dreamInfo = "dream_info"
    }

}

func loadJson() {
    
    guard let data = json.data(using: .utf8) else {
        print("Cant convert String to Data")
        return
    }

    
    do {
        let model = try JSONDecoder().decode( MyModel.self, from: data)
        if let data = model.data {
            let array = data.filter({$0.userName != nil}).map({$0.userName!})
            print(array)
        }
    } catch {
        print("Can't convert json to model")
    }
    
}

loadJson()

結果在控制臺：

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