Question

假设您有一个访问服务器的应用程序？您将如何处理从服务器获取新数据？

Answer 1

你可能会因为收到如此多的投票而感到惊讶。原因是您没有提供有关what you have tried to solve the problem的任何信息。

由于您还没有提供任何细节，我假设您需要一些基本结构化数据（例如JSON）来从服务器发送/检索。

以下代码将允许您发送GET / POST / PUT请求并轻松处理。

  public enum RESTMethod:String {
       case get = "GET"
       case post = "POST"
       case put = "PUT"
  }

  public func sendRequest(_ url: String,
                        method: RESTMethod,
                        headers: [String : String],
                        parameters: [String : Any],
                        completionHandler: @escaping (Data?, URLResponse?, Error?) -> Void) -> URLSessionTask! {
    let requestURL: URL
    if method == .get {
        let parameterString = parameters.stringFromHttpParameters()
        requestURL = URL(string:"\(url)?\(parameterString)")!
    } else {
        requestURL = URL(string: url)!
    }


    var request = URLRequest(url: requestURL)
    request.allHTTPHeaderFields = headers
    request.httpMethod = method.rawValue
    if method == .post {
        let jsonData = try? JSONSerialization.data(withJSONObject: parameters)
        request.httpBody = jsonData
    }
    request.timeoutInterval = 60


    let task = URLSession.shared.dataTask(with: request) { (data, response, error) in

        completionHandler(data,response,error)
    }

    task.resume()

    return task

}


extension Dictionary {

/// Build string representation of HTTP parameter dictionary of keys and objects

func stringFromHttpParameters() -> String {
    let parameterArray = self.map { (key, value) -> String in
        let percentEscapedKey = (key as! String).addingPercentEncodingForURLQueryValue()!
        let percentEscapedValue = (value as? String ?? "\(value)").addingPercentEncodingForURLQueryValue()!
        return "\(percentEscapedKey)=\(percentEscapedValue)"
    }

    return parameterArray.joined(separator: "&")
}

}

用法：

sendRequest("http://yourserver",
             method: .get, // .post or .put
             headers: [],
             parameters: [],
             completionHandler: { (data, response, error) in

   // Handle response here

})

您将如何处理从服务器获取新数据？

1 个答案: