如何取消URL会话请求 [英] How to cancel a URL session request

问题描述

我正在使用将图像转换为base64并向API发送图像作为参数，将多个图像上传到服务器.但是，当我们一次又一次调用api时，如何在单击按钮时停止api调用.我正在使用下面的代码来调用API.

I am upload multiple image to server using convert image to base64 and send image in a API as a parameter. But when we call api again and again then how to stop api calling on button click. I am using below code to call API.

预先感谢

let urlPath: String = "URL"
        let url: URL = URL(string: urlPath)!
        var request1 = URLRequest(url: url)
        request1.httpMethod = "POST"
        let stringPost="imgSrc=\(image)"
        let data = stringPost.data(using: String.Encoding.utf8)
        // print("data\(data)")
        request1.httpBody=data

        request1.timeoutInterval = 60
        let _:OperationQueue = OperationQueue()
        let task = session.dataTask(with: request1){data, response, err in
            do
            {
                if data != nil
                {
                    print("data\(String(describing: data))")
                    if let jsonResult = try JSONSerialization.jsonObject(with: data!, options: []) as? NSDictionary
                    {
                        DispatchQueue.main.async
                            {
                        print("json\(jsonResult)")


                    }
                }

            }
            catch let error as NSError
            {
                DispatchQueue.main.async
                    {

                print("error is \(error)")
                print("error desc \(error.localizedDescription)")
                }
            }}
        task.resume()

推荐答案

将对象 task 设置为全局变量，然后可以通过以下任何方式将其取消:

Make the object task as a global variable, then you can cancel it anywhere by:

task.cancel()

或者，如果对象 session 是 URLSession 实例，则可以通过以下方式取消它:

Alternatively, if the object session is a URLSession instance, you can cancel it by:

session.invalidateAndCancel()

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