ios - JSONDecoder 无法解码嵌套字典

Question

我正在使用 JSONDecoder 从具有嵌套字典的 JSON 文件中解码。它无法从 json 数据解码到我的自定义模型。

这是我在我的代码中尝试过的。

1. JSONDecoder 看起来像这样：

let netWorkManager = NetWorkManager(URL: url, httpMethodType: .GET)
        netWorkManager.callAPI { (data, status, error) in
            guard let data = data else {
                onFail(NetWorkError.otherError)
                return
            }

            switch status {
            case 200:
                do{
                    if let responseModel = try JSONDecoder().decode(ResonseModel?.self, from: data) {
                        onSuccess(responseModel)
                    }
                }catch {
                    onFail(NetWorkError.otherError)
                }
            default:
                onFail(NetWorkError.otherError)
            }
        }

2. 该模型如下所示：

struct ResonseModel: Codable {
    let type : String
    let format: String
    let data: [String: Champion]

    struct Champion: Codable {
        let version: String
        let id: String
        let key: Int
        let name: String
        let title: String
        let blurb: String
    }
}

3. JSON 结构如下所示：

{
    "type": "champion",
    "format": "standAloneComplex",
    "version": "9.3.1",
    "data": {
        "Aatrox": {
            "version": "9.3.1",
            "id": "Aatrox",
            "key": "266",
            "name": "Aatrox",
            "title": "the Darkin Blade",
            "blurb": "Once honored defenders of Shurima against the Void, Aatrox and his brethren would eventually become an even greater threat to Runeterra, and were defeated only by cunning mortal sorcery. But after centuries of imprisonment, Aatrox was the first to find...",
            "info": {
                "attack": 8,
                "defense": 4,
                "magic": 3,
                "difficulty": 4
            },
            "tags": [
                "Fighter",
                "Tank"
            ],
            "partype": "Blood Well",

        },
        "Ahri": {
            "version": "9.3.1",
            "id": "Ahri",
            "key": "103",
            "name": "Ahri",
            "title": "the Nine-Tailed Fox",
            "blurb": "Innately connected to the latent power of Runeterra, Ahri is a vastaya who can reshape magic into orbs of raw energy. She revels in toying with her prey by manipulating their emotions before devouring their life essence. Despite her predatory nature...",
            "info": {
                "attack": 3,
                "defense": 4,
                "magic": 8,
                "difficulty": 5
            },

            "tags": [
                "Mage",
                "Assassin"
            ],
            "partype": "Mana",

        },
        ...

如果您想查看它，这是 JSON 的链接：http: //ddragon.leagueoflegends.com/cdn/9.3.1/data/en_US/champion.json

我想将“数据”属性解码为一个字典，其键是冠军的名字，值是冠军。但是 jsonDecoder 似乎无法识别我的模型结构。它最终捕获了错误。

标签： iosjsonswiftswift4jsondecoder

Answer 1

JSON 参数“key”不是整数。

将其更改为 String ，它将起作用：

struct ResonseModel: Codable {
    let type : String
    let format: String
    let data: [String: Champion]

    struct Champion: Codable {
        let version: String
        let id: String
        let key: String
        let name: String
        let title: String
        let blurb: String
    }
}