iOS swift - 处理来自 API 的响应

Question

我对 Swift 和 iOS 开发还很陌生。我想知道如果我使用 JavaScript，如何做一些相对简单的事情。

我正在调用返回以下内容的 API。请原谅格式化，但它是直接从 Xcode 控制台复制的。

["type": success, "value": <__NSArrayI 0x600000030340>(
       {
          categories = ();
          id = 155;
          joke = "Chuck Norris does not &quot;style&quot; his hair. It lays perfectly in place out of sheer terror.";
       },
       {
            categories = (nerdy);
            id = 69;
            joke = "Scientists have estimated that the energy given off during the Big Bang is roughly equal to 1CNRhK (Chuck Norris Roundhouse Kick).";
       }
    )
]

我想遍历响应并添加到数组中。在 JavaScript 中，它看起来像下面这样:

let jokes = [];
response.value.forEach(item => {
   jokes.push(item.joke)
})

不一定要和上面的完全一样。我有信心快速使用循环并附加到数组。我正在努力做的是访问从 API 返回的 value 数组中的笑话。

我的 Controller 如下所示:

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let url = URL(string: "http://api.icndb.com/jokes/random/2")
        URLSession.shared.dataTask(with:url!, completionHandler: {(data, response, error) in
            guard let data = data, error == nil else { return }
            do {
                let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as! [String:Any]
                print(json["value"])
                // not sure how to access each joke in the array here
            } catch let error as NSError {
                print(error)
            }
        }).resume()
    }
}

Answer 1

你可以试试

if let va = json["value"] as? [[String:Any]] {
   va.forEach { print($0["joke"]) }
}

我更愿意为此编写一个Codable结构

struct Root: Codable {
    let type: String
    let value: [Value]
}

struct Value: Codable {
    let categories: [Category]
    let id: Int
    let joke: String
}

struct Category: Codable {
}

---

let res = try? JSONDecoder().decode(Root.self,from:data)
print(res.value)