将 URLSession 更新为 swift 3 抛出错误

Posted 2023-03-05

【中文标题】将 URLSession 更新为 swift 3 抛出错误

【英文标题】：Updating an URLSession to swift 3 throwing error

【发布时间】：2016-11-21 17:15:21

【问题描述】：

我将我的代码更新为 Swift 3，除了 URLSession 之外，大部分代码都转换得很好，我找不到解决这个错误的方法：

无法使用类型为“（带有：NSMutableURLRequest，completionHandler:（Data？，URLResponse？，NSError？）-> Void）”类型的参数列表调用“dataTask”

这是我的代码：

    let post:NSString = "username=\(username)&userPassword=\(password)&userEmail=\(email)" as NSString

    let url:URL = URL(string: "http://ec2-54-201-55-114.us-west-2.compute.amazonaws.com/wickizerApp/ApplicationDB/scripts/registerUser.php")!

    let request = NSMutableURLRequest(url: url)
    request.httpMethod = "POST"
    request.httpBody = post.data(using: String.Encoding.utf8.rawValue)


    URLSession.shared.dataTask(with: request, completionHandler:  (data:Data?, response:URLResponse?, error:NSError?) -> Void in

        DispatchQueue.main.async
            

                if error != nil 
                    self.displayAlertMessage(error!.localizedDescription)
                    return
                

                do 
                    let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary

                    if let parseJSON = json 

                        let status = parseJSON["status"] as? String

                        if( status! == "200")
                        
                            let myAlert = UIAlertController(title: "Alert", message: "Registration successful", preferredStyle: UIAlertControllerStyle.alert);

                            let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default)(action) in

                                self.dismiss(animated: true, completion: nil)
                            

                            myAlert.addAction(okAction);
                            self.present(myAlert, animated: true, completion: nil)
                         else 
                            let errorMessage = parseJSON["message"] as? String
                            if(errorMessage != nil)
                            
                                self.displayAlertMessage(errorMessage!)
                            

                        

                    
                 catch
                    print(error)
                



        

    ).resume()

在 swift 3 中是否有不同的方式来执行请求，或者他们只是改变了执行请求的方式？

【问题讨论】：

Converting Swift 2.3 to Swift 3.0 - Error, Cannot invoke 'dataTask' with an argument list of type'的可能重复

【参考方案1】：

编译器需要URLRequest 和Error

var request = URLRequest(url: url)
request.httpMethod = "POST"
request.httpBody = post.data(using: .utf8)

URLSession.shared.dataTask(with: request, completionHandler:  (data:Data?, response:URLResponse?, error:Error?) -> Void in

)

或者更短

URLSession.shared.dataTask(with: request, completionHandler:  (data, response, error) in

)

或者更短

URLSession.shared.dataTask(with: request)  (data, response, error) in