ios - 如何使用 Swift Decodable 属性解码嵌套数组的嵌套字典？

Question

我需要在 swift4 中解析的实际 JSON 是，

{
    "class": {
        "semester1": [
            {
                "name": "Kal"
            },
            {
                "name": "Jack"
            },
            {
                "name": "Igor"
            }
        ],
        "subjects": [
            "English",
            "Maths"
        ]
    },
    "location": {
        "Dept": [
            "EnglishDept",
            ],
        "BlockNo": 1000
    },
    "statusTracker": {
        "googleFormsURL": "beacon.datazoom.io",
        "totalCount": 3000
    }
}

我试过但未能执行的代码是，

struct Class: Decodable {
    let semester: [internalComponents]
    let location: [location]
    let statusTracker: [statusTracker]
    enum CodingKeys: String, CodingKey {
        case semester = "semester1"
        case location = "location"
        case statusTracker = "statusTracker"
    }
}
struct location: Decodable {
    let Dept: [typesSubIn]
    let BlockNo: Int
}
struct statusTracker: Decodable {
    let googleFormsURL: URL
    let totalCount: Int
}


struct internalComponents: Decodable {
    let semester1: [semsIn]
    let subjects: [subjectsIn]
}
struct semsIn: Decodable {
    let nameIn: String
}
struct subjectsIn: Decodable {
    let subjects: String
}
struct Dept: Decodable {
    let Depts: String
}

我知道这是完全错误的，有人可以给出实际格式吗？我实际上对“主题”的格式感到困惑。它也不是作为一个整体编译的。

Answer 1

有很多问题。

您犯了一个常见的错误，部分忽略了根对象。

请看一下 JSON:顶层有 3 个键 class、location 和 statusTracker。所有 3 个键的值都是字典，没有数组。

因为 class(小写)是保留字，所以我使用 components。顺便说一句，请遵守结构名称以大写字母开头的命名约定。

struct Root : Decodable {
    let components : Class
    let location: Location
    let statusTracker: StatusTracker

    enum CodingKeys: String, CodingKey { case components = "class", location, statusTracker }
}

还有很多问题。这里是其他结构的合并版本

struct Class: Decodable {
    let semester1: [SemsIn]
    let subjects : [String]
}

struct Location: Decodable {
    let dept : [String]
    let blockNo : Int

    enum CodingKeys: String, CodingKey { case dept = "Dept", blockNo = "BlockNo" }
}

struct SemsIn: Decodable {
    let name: String
}

struct StatusTracker: Decodable {
    let googleFormsURL: String // URL is no benefit
    let totalCount: Int
}

现在解码Root

do {
    let result = try decoder.decode(Root.self, from: data)
} catch { print(error) }