如何解决这个问题＆＃34;对成员＆＃39; dataTask的不明确引用（with：completionHandler :)＆＃39; ＆＃34;

Question

如何解决此问题

  

对成员＆＃39; dataTask的不明确引用（with：completionHandler：）＆＃39;

    guard let requestUrl = URL(string:"http://www.digi.com/laravel_api_demo/api/demoapi") else { return }

    let request = NSMutableURLRequest(url: requestUrl)
    request.httpMethod = "POST"

    let postString = "firstName=James&lastName=Bond"
    request.httpBody = postString.data(using: String.Encoding.utf8)
    let task = URLSession.shared.dataTask(with: request){ (data, response, error) in

        if error != nil
        {
            //print(error)
            return
        }

        //You can print out response object
        print("response = \(response)")

        //Print out response body
        let responseString = String(data: data, encoding: NSUTF8StringEncoding)
        print("response data = \(responseString)")

        var err: Error?
        var json = JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? NSDictionary

        if let parseJSON = json {
            var firstNameValue = parseJSON["firstName"] as? String
            print("first name value = \(firstNameValue)")
        }
    }
    task.resume()
}

Answer 1

调用应该是这样的，第一个参数的类型为URL，而不是NSMutableURLRequest

  guard let requestUrl = URL(string:"http://www.digi.com/laravel_api_demo/api/demoapi") else { return }

    var  request = URLRequest(url: requestUrl)
    request.httpMethod = "POST"

    let postString = "firstName=James&lastName=Bond"
    request.httpBody = postString.data(using: String.Encoding.utf8)
    let task = URLSession.shared.dataTask(with: request){ (data, response, error) in

        if error != nil
        {
            //print(error)
            return
        }


    }
    task.resume()

在这里看到可用方法的签名