iOS杀死程序后数据上报

1、前言

杀死进程 ，网络请求调用如果是在子线程.这个时候RunLoop循环已经结束，此时网络请求进行到一半就会停止，所以不会回调回来。
这是时候我们只需要在主线程做网络请求，难后sleep2秒。服务器就可以正常下发数据

2、代码实现

func applicationWillTerminate(_ application: UIApplication) {

        print("applicationWillTerminate")

        let path : URL = URL.init(string: "[https://api.zhuishushenqi.com/cats/lv2/statistics](https://api.zhuishushenqi.com/cats/lv2/statistics)")!

        let conifg : URLSessionConfiguration = URLSessionConfiguration.default;

        let session : URLSession = URLSession.init(configuration: conifg);

        var request = URLRequest.init(url: path)

        request.timeoutInterval = 10;

        request.addValue("application/x-www-form-urlencoded", forHTTPHeaderField:"Content-Type")

        request.addValue("chrome", forHTTPHeaderField:"User-Agent")

        let task : URLSessionDataTask = session.dataTask(with: request) { (data, respond, error) in

            let json = JSON(data as Any)

            print(json)

        }

        task.resume();

        sleep(2)

        print("=================")

        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.

    }

3、用户切后台在杀死程序这时候我们改怎么做
程序进入后台后，如果内存不足被系统杀死或者手动杀死，都不会调用 applicationWillTerminate
解决方法：可以在程序进入后台时，添加一后台运行通知函数，也就是程序进入后台一段时间内，程序还在运行，并可以响应一些消息。

    func applicationDidEnterBackground(_ application: UIApplication) {

        print("applicationDidEnterBackground")

        UIApplication.shared.beginBackgroundTask {

        }

    }

    func applicationWillTerminate(_ application: UIApplication) {

        print("applicationWillTerminate")

        let path : URL = URL.init(string: "[https://api.zhuishushenqi.com/cats/lv2/statistics](https://api.zhuishushenqi.com/cats/lv2/statistics)")!

        let conifg : URLSessionConfiguration = URLSessionConfiguration.default;

        let session : URLSession = URLSession.init(configuration: conifg);

        var request = URLRequest.init(url: path)

        request.timeoutInterval = 10;

        request.addValue("application/x-www-form-urlencoded", forHTTPHeaderField:"Content-Type")

        request.addValue("chrome", forHTTPHeaderField:"User-Agent")

        let task : URLSessionDataTask = session.dataTask(with: request) { (data, respond, error) in

            let json = JSON(data as Any)

            print(json)

        }

        task.resume();

        sleep(2)

    }