控制台打印：

[BoringSSL] nw_protocol_boringssl_get_output_frames(1301) [C1.1:2][0x1023291b0] get output frames failed, state 8196

解决方法：

在application中 的

- (void)applicationWillResignActive:(UIApplication *)application{} 

添加

  __block UIBackgroundTaskIdentifier bgTask = [[UIApplication sharedApplication] beginBackgroundTaskWithName:@"bg_task" expirationHandler:^{

        [[UIApplication sharedApplication] endBackgroundTask:bgTask];

        bgTask =UIBackgroundTaskInvalid;

    }];