json - 获取 JSON 并在 Swift 中解析它？

Question

我正在使用 httpget 请求从 url 获取 json 文件。然后，我想将来自 json 的所有标签打印到屏幕上。我使用此代码来执行此操作，但是我无法通过这种方式获得。你能帮帮我吗？

swift 3 代码:

let url:URL = URL(string: "https://api.hurriyet.com.tr/v1/articles...deleted...")!
let session = URLSession.shared

var request = URLRequest(url: url)
request.httpMethod = "GET"
request.cachePolicy = NSURLRequest.CachePolicy.reloadIgnoringCacheData

URLCache.shared = URLCache(memoryCapacity: 0, diskCapacity: 0, diskPath: nil)

let task = session.dataTask(with: request as URLRequest) {
    (data, response, error) in

    guard let data = data, let _:URLResponse = response, error == nil else {
        print("error")
        return
    }

    let dataString =  String(data: data, encoding: String.Encoding.utf8)

    for tags in data{
        for tag in tags["Tags"]{
            print(tag)
        }
    }


}

task.resume()

示例 json 输出和 dataString 变量的输出:

"[{"Tags":["fırat","kalkanı operasyonu","gazetehaberleri"]},{"Tags":["yüksek yargı","adliye","gazetehaberleri"]},{"Tags":["foo","Hüseyin Avni Mutlu","Hüseyin Çapkın","gazetehaberleri"]}]"

Answer 1

首先只是关于您的代码的一些注释。将 URLRequest 转换为 URLRequest 是多余的。您需要使用 JSONSerialization jsonObject with data 方法将您的 json 数据解析为字典数组:

let jsonString = "[{\"Tags\":[\"fırat\",\"kalkanı operasyonu\",\"gazetehaberleri\"]},{\"Tags\":[\"yüksek yargı\",\"adliye\",\"gazetehaberleri\"]},{\"Tags\":[\"foo\",\"Hüseyin Avni Mutlu\",\"Hüseyin Çapkın\",\"gazetehaberleri\"]}]"

let data = Data(jsonString.utf8)

let dictionaries = (try? JSONSerialization.jsonObject(with: data)) as? [[String:Any]] ?? []

for dict in dictionaries {
    let tags = dict["Tags"] as? [String] ?? []

    for tag in tags {
        print(tag)  // fırat
                    // kalkanı operasyonu
                    // gazetehaberleri
                    // yüksek yargı
                    // adliye
                    // gazetehaberleri
                    // foo
                    // Hüseyin Avni Mutlu
                    // Hüseyin Çapkın
                    // gazetehaberleri
    }
}