Swift ios alamofire 提出请求错误线程 1：signal SIGABRT at

Question

我正在尝试使用 alamofire http 请求从 api 更新 api，我的代码如下。我使用的 api https://jsonplaceholder.typicode.com/posts 。我似乎无法更新数据，我收到了一个错误，即线程 1: signal SIGABRT at line guard let json = response.result.value as！ [[字符串：任何]]？否则{返回}

完整代码 func updateApi(){

        let  params  = ["userId": 1,
                        "id": 1,
                        "title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit",
                        "body": "quia et suscipit\nsuscipit r

ecusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto"] as [String: Any]

        Alamofire.request("https://jsonplaceholder.typicode.com/posts/1", method: .put, parameters: params, encoding: JSONEncoding.default, headers: nil).responseJSON { (response:DataResponse<Any>) in

            switch(response.result) {


            case .success(_):
                guard let json = response.result.value as! [[String:Any]]? else{ return}
                print("Response \(json)")


                break

            case .failure(_):
                print("Error")
                break

            }
        }

    }

Answer 1

https://jsonplaceholder.typicode.com/posts 和https://jsonplaceholder.typicode.com/posts/1 的结果不同。后者返回如下内容：

{
  "userId": 1,
  "id": 1,
  "title": "sunt aut facere repellat provident occaecati excepturi optio reprehenderit",
  "body": "quia et suscipit\nsuscipit recusandae consequuntur expedita et cum\nreprehenderit molestiae ut ut quas totam\nnostrum rerum est autem sunt rem eveniet architecto"
}

它不是 JSON 数组而是 JSON 对象。所以你的强制转换 as! [[String:Any]]? 失败了。

将行改为：

    guard let json = response.result.value as? [String:Any] else {
        return //<- Put breakpoint here, when you find unexpected early return
    }

您最好不要使用强制转换，这会使您的应用在没有太多有用信息的情况下崩溃。