Question

我遇到了 show [“data”] 部分代码的问题，错误读取类型'RecentTvListData'没有下标成员。我在底部添加了结构以供参考。

URLSession.shared.dataTask(with: url) { (data, response, err) in

        guard let data = data else {return}

        do {

            let shows =  try
                JSONDecoder().decode(RecentTvListData.self, from: data)
            print(shows)

            self.tvShows = [RecentTvList]()

            if let array = shows["data"] as? [[String: Any]] {
                for dictionary in array {

                var tvShow = RecentTvList()
                    tvShow.title = dictionary["title"] as? String
                    tvShow.poster_url = dictionary["poster_url"] as? String
                    self.tvShows?.append(tvShow)
                }
            }

        } catch let jsonErr {
            print("Error serializing JSON", jsonErr)
        }

    }.resume()

struct RecentTvListData: Decodable  {
    var data: [RecentTvList]
}

struct RecentTvList: Decodable  {
    var title: String?
    var poster_url: String?
}

Answer 1

显示属性属于RecentTvListData类型，因此您需要访问shows.data

小例子：

<强>的Structs

struct RecentTvList: Decodable  {
    var title: String?
    var poster_url: String?

    // Custom keys for poster_url
    enum CodingKeys: String, CodingKey {
        case title
        case poster_url = "poster_url"
    }
}

struct RecentTvListData: Decodable  {
    var data: [RecentTvList]
}

没有循环

var tvShows: [RecentTvList] = []
do {
    let shows = try JSONDecoder().decode(RecentTvListData.self, from: data)
    tvShows = shows.data
} catch {
    debugPrint("Error")
}

有循环

var tvShows: [RecentTvList] = []
do {
    let shows = try JSONDecoder().decode(RecentTvListData.self, from: data)
    for item in shows.data {
        var tvShow = RecentTvList()
        tvShow.title = item.title
        tvShow.poster_url = item.poster_url
        tvShows.append(tvShow)
    }
} catch {
    debugPrint("Error")
}

JSON解析错误 - 类型'RecentTvListData'没有下标成员

1 个答案: