Swift 4 JSONSerialization.jsonObject

首先,定义保存解析数据的类型：

struct ResponSEObject: Codable {
    let data: [NewsItem]
}

struct NewsItem: Codable {
    let newsId: Int
    let title: String
    let newsDate: Date
    let newsURL: URL
    let shortDescription: String
    let categoryID: Int
    let categoryName: String
    let coordinates: [Coordinate]

    // because your json keys don't follow normal Swift naming convention,use CodingKeys to map these property names to JSON keys

    enum CodingKeys: String,CodingKey {
        case newsId = "news_id"
        case title
        case newsDate = "news_date"
        case newsURL = "news_url"
        case shortDescription = "short_description"
        case categoryID = "category_id"
        case categoryName = "category_name"
        case coordinates = "latlng"
    }
}

struct Coordinate: Codable {
    let lat: String
    let lng: String
}

然后你可以解析它：

let formatter = DateFormatter()
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.timeZone = TimeZone(secondsFromGMT: 0)
formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"

let decoder = JSONDecoder()
decoder.dateDecodingStrategy = .formatted(formatter)
do {
    let responSEObject = try decoder.decode(ResponSEObject.self,from: data)
    print(responSEObject.data)
} catch {
    print(error)
}

显然,如果你的JSON不同,你可能需要相应地改变你的对象(例如,奇怪的是latlng是一个坐标数组).此外,如果要将这些字符串中的一些转换为数字,则可以定义自定义init(from :)方法,但我宁愿修复JSON(为什么latlng返回字符串值而不是数值).

有关更多信息,请参阅Encoding and Decoding Custom Types.

顺便说一句,我建议不要使用这种模式(注意,这是你的网络请求逻辑,但切除了NSData)：

let data = try! Data(contentsOf: url.getURL())

这将同步检索数据,这可能会有问题,因为

>在检索数据时,应用程序将被冻结,导致用户体验不佳;
>您可能会面临查看冻结应用程序的监视程序进程杀死您的应用程序的风险;和
>您没有强大的错误处理,如果网络请求失败,这将会崩溃.

我建议使用URLSession：

let task = URLSession.shared.dataTask(with: url.getURL()) { data,_,error in
    guard let data = data,error == nil else {
        print(error ?? "Unknown error")
        return
    }

    // now parse `data` like shown above

    // if you then need to update UI or model objects,dispatch that back
    // to the main queue:

    DispatchQueue.main.async {
        // use `responSEObject.data` to update model objects and/or UI here
    }
}
task.resume()