Ios 如何为动态键创建模型，json解析，swift5

我正在解析一个json数据，并试图创建一个模型，但不知道如何从json数据（我已经提供）中获取标题和提取属性，因为

pageids

属性是动态的。请告诉我如何创建模型以使用id（存储在

pageID

属性中）从页面提取

title

属性

jsonData的链接

我试了一点，下面是我的代码，但我不认为这是正确的

var ID = ""
struct Document:Codable {
    
    let batchcomplete:String
    let query:Query
}
struct Query:Codable {
    let normalized:[Normalized]
    
    let pages:Pages
    
    var pageids:[String]{
        didSet{
            ID = oldValue[0]
        }
    }
    
}

struct Normalized:Codable {
    let from:String
    let to:String // it is a name of an flower
}
struct Pages:Codable {
    let id:[Pages2]
    enum CodingKeys:CodingKey {
        case id = "\(ID)"
    }
}
struct Pages2:Codable {
    let title:String // this is an official name of flower
    let extract:String // this is a body
    let thumbnail:Thumbnail
}
struct Thumbnail:Codable {
    let source:String //this is an url for photo
}

---

映射JSON的模型如下所示：

struct Document: Codable {
    let batchcomplete: String
    let query: Query
}

struct Query: Codable {
    let normalized: [Normalized]
    var pageids: [String]
    let pages: [String: Page]
}

struct Normalized: Codable {
    let from: String
    let to: String
}

struct Page: Codable {
    let title: String
    let extract: String
    let thumbnail: Thumbnail
}
struct Thumbnail: Codable {
    let source: String
}

您可以使用

pageid

数组和

pages

字典访问每个页面：

let decoder = JSONDecoder()
do {
    let decoded = try decoder.decode(Document.self, from: Data(jsonString.utf8))
    decoded.query.pageids.forEach { id in
        guard let page = decoded.query.pages[id] else { return }
        print(page.title)
    }
} catch {
    print(error)
}

然而，我更愿意对模型做一个小的修改，以便更容易访问页面。这将需要自定义执行

Query

struct:

struct Query: Decodable {
    let normalized: [Normalized]
    let pages: [Page]
    
    enum CodingKeys: String, CodingKey {
        case normalized
        case pageids
        case pages
    }
    
    init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        normalized = try container.decode([Normalized].self, forKey: .normalized)
        
        let pageids = try container.decode([String].self, forKey: .pageids)
        let pagesDict = try container.decode([String: Page].self, forKey: .pages)
        pages = pageids.compactMap { pagesDict[$0] }
    }
}

然后，访问每个页面就像循环一样简单：

let decoder = JSONDecoder()
do {
    let decoded = try decoder.decode(Document.self, from: Data(jsonString.utf8))
    decoded.query.pages.forEach { page in
        print(page.title)
    }
} catch {
    print(error)
}

---

映射JSON的模型如下所示：

struct Document: Codable {
    let batchcomplete: String
    let query: Query
}

struct Query: Codable {
    let normalized: [Normalized]
    var pageids: [String]
    let pages: [String: Page]
}

struct Normalized: Codable {
    let from: String
    let to: String
}

struct Page: Codable {
    let title: String
    let extract: String
    let thumbnail: Thumbnail
}
struct Thumbnail: Codable {
    let source: String
}

您可以使用

pageid

数组和

pages

字典访问每个页面：

let decoder = JSONDecoder()
do {
    let decoded = try decoder.decode(Document.self, from: Data(jsonString.utf8))
    decoded.query.pageids.forEach { id in
        guard let page = decoded.query.pages[id] else { return }
        print(page.title)
    }
} catch {
    print(error)
}

然而，我更愿意对模型做一个小的修改，以便更容易访问页面。这将需要自定义执行

Query

struct:

struct Query: Decodable {
    let normalized: [Normalized]
    let pages: [Page]
    
    enum CodingKeys: String, CodingKey {
        case normalized
        case pageids
        case pages
    }
    
    init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        normalized = try container.decode([Normalized].self, forKey: .normalized)
        
        let pageids = try container.decode([String].self, forKey: .pageids)
        let pagesDict = try container.decode([String: Page].self, forKey: .pages)
        pages = pageids.compactMap { pagesDict[$0] }
    }
}

然后，访问每个页面就像循环一样简单：

let decoder = JSONDecoder()
do {
    let decoded = try decoder.decode(Document.self, from: Data(jsonString.utf8))
    decoded.query.pages.forEach { page in
        print(page.title)
    }
} catch {
    print(error)
}