Swift XMLMapper 解码嵌套属性

Question

使用 here 中的库。这是详细信息，

XML:

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <status code="25">Verification required</status>
    <parsed-challenge>
        <action type-id="11">
            <url content-type="application/x-www-form-urlencoded" method="POST" type-id="1">https://example.com</url>
            <hidden-fields>
                <apiRequest>MIAGCSqGSIb3DQEHA6CAMIACAQAxggFAMIIBPAIBAD</apiRequest>
            </hidden-fields>
        </action>
    </parsed-challenge>
    <return-url>https://example.com</return-url>
</root>

结构：

struct Secure: XMLMappable {

    internal(set) var statusCode: Int?
    internal(set) var status: String?
    internal(set) var actionType: Int?
    internal(set) var url: URLInfo?
    internal(set) var hiddenFields: [String:String]?
    internal(set) var returnURL: Foundation.URL?

    public var nodeName: String!

    public init(map: XMLMap) {
        statusCode = map.value()
        status = map.value()
        actionType = map.value()
        url = map.value()
        hiddenFields = map.value()
        returnURL = map.value()
    }

    public mutating func mapping(map: XMLMap) {
        statusCode      <- map["status"].attributes["code"]
        status          <- map["status"].innerText
        actionType      <- map["parsed-challenge.action"].attributes["type-id"]
        url             <- map["parsed-challenge.action.url"]
        hiddenFields    <- map["parsed-challenge.action.hidden-fields"]
        returnURL       <- (map["return-url"], XMLURLTransform())
    }
}

解码时，

Secure(statusCode: nil, status: nil, actionType: nil, url: Optional(URLInfo(url: Optional(https://example.com), method: Optional("POST"), contentType: Optional("application/x-www-form-urlencoded"), typeId: Optional(1))), hiddenFields: Optional(["__name": "hidden-fields", "apiRequest": "MIAGCSqGSIb3DQEHA6CAMIACAQAxggFAMIIBPAIBAD"]), returnURL: Optional(https://example.com))

status、statusCode 和 actionType 有什么问题？为什么他们不解码，是不是因为深度嵌套解码是不可能的？

Answer 1

我希望我的图书馆能够像那样工作。（这样嵌套值的映射非常干净）但是目前很难映射嵌套属性和 innerText 内部具有其他元素或属性的元素。

因此，映射您的 XML 的建议模型如下所示：

struct Secure: XMLMappable {
    public var nodeName: String!

    internal(set) var status: Status?
    internal(set) var action: Action?
    internal(set) var returnURL: Foundation.URL?

    public init(map: XMLMap) { }

    public mutating func mapping(map: XMLMap) {
        status       <- map["status"]
        action       <- map["parsed-challenge.action"]
        returnURL    <- (map["return-url"], XMLURLTransform())
    }
}

struct Status: XMLMappable {
    public var nodeName: String!

    internal(set) var statusCode: Int?
    internal(set) var message: String?

    public init(map: XMLMap) { }

    public mutating func mapping(map: XMLMap) {
        statusCode    <- map.attributes["code"]
        message       <- map.innerText
    }
}

struct Action: XMLMappable {
    public var nodeName: String!

    internal(set) var actionType: Int?
    internal(set) var url: URLInfo?
    internal(set) var hiddenFields: [String:String]?

    public init(map: XMLMap) { }

    public mutating func mapping(map: XMLMap) {
        actionType      <- map.attributes["type-id"]
        url             <- map["url"]
        hiddenFields    <- map["hidden-fields"]
    }
}

struct URLInfo: XMLMappable {
    public var nodeName: String!

    internal(set) var contentType: String?
    internal(set) var method: String?
    internal(set) var typeID: Int?
    internal(set) var url: Foundation.URL?

    public init(map: XMLMap) { }

    public mutating func mapping(map: XMLMap) {
        contentType    <- map.attributes["content-type"]
        method         <- map.attributes["method"]
        typeID         <- map.attributes["type-id"]
        url            <- (map.innerText, XMLURLTransform())
    }
}

虽然我个人使用（因为我知道如何破解我的图书馆）我可以使用这样的东西：

struct Secure: XMLMappable {
    public var nodeName: String!

    internal(set) var statusCode: Int?
    internal(set) var status: String?
    internal(set) var actionType: Int?
    internal(set) var url: URLInfo?
    internal(set) var hiddenFields: [String:String]?
    internal(set) var returnURL: Foundation.URL?

    public init(map: XMLMap) { }

    public mutating func mapping(map: XMLMap) {
        statusCode      <- map["status._code"]
        status          <- map["status.__text"]
        actionType      <- map["parsed-challenge.action._type-id"]
        url             <- map["parsed-challenge.action.url"]
        hiddenFields    <- map["parsed-challenge.action.hidden-fields"]
        returnURL       <- (map["return-url"], XMLURLTransform())
    }
}

struct URLInfo: XMLMappable {
    public var nodeName: String!

    internal(set) var contentType: String?
    internal(set) var method: String?
    internal(set) var typeID: Int?
    internal(set) var url: Foundation.URL?

    public init(map: XMLMap) { }

    public mutating func mapping(map: XMLMap) {
        contentType    <- map.attributes["content-type"]
        method         <- map.attributes["method"]
        typeID         <- map.attributes["type-id"]
        url            <- (map.innerText, XMLURLTransform())
    }
}

两个模型都可以正常工作。

如果嵌套映射在下一个版本中得到改进，我一定会更新这个post。

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