在 Swift 中的文本视图中显示 REST API 结果不起作用

display the REST API result in textview in Swift doesn't work

我正在尝试开发一个函数来连接和读取 REST API,然后在文本视图中显示返回的 json,代码如下:

func restapiRead()
{
    var request = URLRequest(url: URL(string: "https://reqres.in/api/users?page=1")!)
    request.httpMethod = "GET"

    let session = URLSession.shared
    let task = session.dataTask(with: request, completionHandler: { data, response, error -> Void in
        print(response!)
        do {
            let json = try JSONSerialization.jsonObject(with: data!) as! Dictionary<String, AnyObject>
            print(json)
            self.mytv.text = "\(json as! [[String: AnyObject]])" //> code line 1
            self.mytv.text = "\(json as! NSArray)" //> code line 2
        }
        catch {
            print("error")
        }
    })

    task.resume()    
  }

实际上上面的所有代码都没有任何错误,但后来我使用 codeline1 或 codeline2 将结果复制到 textview 中,它会发出“警告”消息警告:

从“[String : AnyObject]”转换为无关类型“[[String : AnyObject]]”总是失败

如果我 运行 忽略警告并 运行,我会在代码行 1(以及代码行 2)处收到以下错误:

线程 6:EXC_BAD_INSTRUCTION(代码=EXC_I386_INVOP,子代码=0x0)

如何在文本视图中将结果复制为原始 json?

谢谢

您应该json 转换为字符串以供 textView 使用。

   json.description

测试 100% 正常

代码更改为:

  func restapiRead()
    {
        var request = URLRequest(url: URL(string: "https://reqres.in/api/users?page=1")!)
        request.httpMethod = "GET"

        let session = URLSession.shared
        let task = session.dataTask(with: request, completionHandler: { data, response, error -> Void in
            print(response!)
            do {
                    let json = try JSONSerialization.jsonObject(with: data!) as! Dictionary<String, AnyObject>

                 DispatchQueue.main.async {
                self.mytv.text =  json.description
                   }
                }
         
            catch {
                print("error")
            }
        })

        task.resume()
      }