ios - 将长 JSON 响应分配给 Dictionary 会产生线程错误

Question

当尝试将长 JSON 响应分配给字典时，我得到了

nil

或

Thread 1:EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)

分配一个简短的回复效果很好。这是我的代码

func getUserInfo() {
        let access_token : String = accessToken_json_response["access_token"] ?? "empty"
        if access_token != "empty" {
            Alamofire.request("https://api.github.com/user?access_token=\(access_token)").responseJSON { response in
                    if let json = response.result.value {
                        print(json) //The JSON prints, but takes more than a second to do so.   
                        self.getUser_json_response = json as? Dictionary<String, String> //This produces the thread error when the response is long.
                        print(self.getUser_json_response) //This either prints nil, or a thread error produces in the previous instruction
                    }
            }
        }
    }

Answer 1

首先，您要转换为一个可选字典，因此它应该是有条件的绑定(bind)，即:

if let unwrappedJson = json as? ....

其次，您应该转换为 [String : Any] 即:

    if let unwrappedJson = json as? [String : Any]