ios – Swift 3 – 发送make同步http请求

概述我有以下代码： func completeLoadAction(urlString:String) -> Int { let url = URL(string:urlString.trimmingCharacters(in: .whitespaces)) let request = URLRequest(url: url!) let task = URLSession.sh 我有以下代码：

func completeLoadAction(urlString:String) -> Int {    let url = URL(string:urlString.trimmingCharacters(in: .whitespaces))    let request = URLRequest(url: url!)    let task = URLSession.shared.dataTask(with: request) { data,response,error in        guard let data = data,error == nil else {                                                 // check for fundamental networking error            print("error=\(error)")            let ac = UIAlertController(Title: "Unable to complete",message: "The load has been added to the completion queue. This will be processed once there is a connection.",preferredStyle: .alert)            ac.addAction(UIAlertAction(Title: "OK",style: .default))            self.present(ac,animated:  true)            return        }    let httpStatus = response as? httpURLResponse        var httpStatusCode:Int = (httpStatus?.statusCode)!        let responseString = String(data: data,enCoding: .utf8)        print("responseString = \(responseString)")        let ac = UIAlertController(Title: "Completed Successfully",message: "The "+coldel+" has been completed successfully",preferredStyle: .alert)        ac.addAction(UIAlertAction(Title:"Continue",style: .default,handler:  { action in self.performSegue(withIDentifIEr: "segueConfirmedLoad",sender: self) }))        self.present(ac,animated: true)    }    task.resume()    return httpStatusCode}

我需要能够调用它并同时检查返回值,因为它是http状态代码,它会让我知道调用是否成功.

问题是因为它在dataTask中我无法访问响应状态代码

var httpStatusCode:Int = (httpStatus?.statusCode)!

因为任务在调用Task.Resume()之前不会启动,并且任务是异步的,所以它永远不会工作.

这有什么办法吗？

解决方法 总有一种方法可以使用异步模式.

要使函数异步,请添加完成块

func completeLoadAction(urlString:String,completion: (Int) -> ()) {   let url = URL(string:urlString.trimmingCharacters(in: .whitespaces))   let request = URLRequest(url: url!)   let task = URLSession.shared.dataTask(with: request) { data,error in      guard let data = data,error == nil else {                                                 // check for fundamental networking error         print("error=\(error)")         dispatchQueue.main.async {            let ac = UIAlertController(Title: "Unable to complete",animated:  true)         }         completion(0) // or return an error code          return           }      let httpStatus = response as? httpURLResponse      var httpStatusCode:Int = (httpStatus?.statusCode)!      let responseString = String(data: data,enCoding: .utf8)      print("responseString = \(responseString)")      dispatchQueue.main.async {         let ac = UIAlertController(Title: "Completed Successfully",preferredStyle: .alert)         ac.addAction(UIAlertAction(Title:"Continue",sender: self) }))         self.present(ac,animated: true)      }      completion(httpStatusCode)   }   task.resume()}

并称之为

completeLoadAction(urlString: "www.something.com") { code in   print(code)}

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