ios - AlamoFire 无线程警告

Question

在使用 AlamoFire 发出请求并访问完成 block 上的 UI 元素时，我没有收到任何警告，但是，如果我尝试在没有 AlamoFire 的情况下做同样的事情，我会得到“UILabel.text 必须仅从主线程使用"，我想知道这里发生了什么？

AlamoFire 示例

    makeRequest(parameters:parameters,URL:.request){
    validatedResponse in 
       label.text = "anything"
    }
           private func makeRequest(parameters:[String:Any]?,URL:URLs,requestType:requestType,method:HTTPMethod , completion: @escaping (_ response:APIResponse) -> ())
        {
            APIinterface.afManager.request(
                baseUrl + URL.rawValue,
                method: method,
                parameters: parameters
                )
                .validate()
                .validate(contentType: ["application/json"])

                .responseJSON
                {
                    response in
                    debugPrint(response)

                    guard let validatedResponse = self.validateResponseForAPI(response: response) else { return }
                    //let validatedResponse = (requestType == .api) ?
                    //    : self.validateExternalResponse(response: response)

                    completion(validatedResponse)

            }
        }

native 示例

 makeRequest(parameters:parameters,URL:.request){
    validatedResponse in 
       label.text = "anything"
    }

          private func makeRequest(parameters:[String:Any]?,url:URLs,requestType:requestType,method:HTTPMethod , completion: @escaping (_ response:ResponseObject?) -> ())
    {
        guard let url = URL(string:baseUrl + url.rawValue) else
        {
            print("Error: cannot create URL")
            return
        }
        let urlRequest = URLRequest(url: url)

        // set up the session
        let config = URLSessionConfiguration.default
        let session = URLSession(configuration: config)

        // make the request
        let task = session.dataTask(with: urlRequest, completionHandler:
        {
            (data, response, error) in
            // do stuff with response, data & error here
            print(response)
            print(error)
            completion(self.validateResponseForAPISwift4(response: data))
        })
        task.resume()
    }

Answer 1

除非您另外指定，否则 Alamofire 回调始终在主线程上执行。这就是您在使用 Alamofire 时没有收到警告的原因。