Extending Background Task timeout period while uploading Large videos iOS

Question

I have an application in which I have to upload large videos to Amazon s3 bucket. I am using NSOperations regulated by an NSOperationQueue to run concurrent tasks.

I don't have problems when upload small videos (smaller then 200 Mb). But the problem is when i try to upload a large video, after 10 minutess the upload process gets interrupted.

I'm already using beginBackgroundTaskWithExpirationHandler:^ to get a window of 10 mins. What is the proper way by which I can extend this timeout period?

Will Apple reject the app if I somehow manage to extend this timeout?

Presently I have the following code in my AppDelegate which I built referring to the link iPhone - Backgrounding to poll for events

  - (void)applicationDidEnterBackground:(UIApplication *)application 
{

    UIApplication*    app = [UIApplication sharedApplication];
    dispatch_block_t expirationHandler;

    expirationHandler = ^{
        bgTask = [app beginBackgroundTaskWithExpirationHandler:expirationHandler];
    };

    bgTask = [app beginBackgroundTaskWithExpirationHandler:expirationHandler];
}

With this piece of code I see that the background task gets never interrupted. As you can see inside the expiration handler, I've initiated another background task event which leads to an infinitely running task. Even though, I can write the logic to end the background task once my upload is finished, but I'm having doubts about this approach..

What do you guys think?

Is it a hack by any means? Will Apple reject the app for following approach?

bgTask = [app beginBackgroundTaskWithExpirationHandler:^(void){ [self.queue waitUntilAllOperationsAreFinished]; [app endBackgroundTask:bgTask]; bgTask = UIBackgroundTaskInvalid; }]; What about this Guys?? — Xcoder, Nov 29 '12 at 06:05
You guys have no right to debate with stupid answers and stupid comments. Honestly this is a topic to debate on. Please guys, I would request you for an open discussion, so that we could eye on details of everything . Thanks — Abdul Yasin, Jun 23 '14 at 07:22
can i use NSOperationQueue to upload large videos in background , will apple rejects my app ?? — Mr.G, Sep 01 '14 at 11:55
This is a question which has become irrelevant - with the onset of iOS 7 and NSURLSession API . — Xcoder, Sep 01 '14 at 13:47

score 2 · Answer 1 · answered Nov 28 '12 at 08:42

2

it seems hackisch but not bad IMHO (the opposite) :D

if apple lets it go through, you're golden but in fact you are abusing bg tasks

BTW: even with that, ios MAY just cancel you! + dont do CPU intensive/memory intensive work as it will affect the performance of other apps maybe

answered Nov 28 '12 at 08:42

Daij-Djan

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You are right brother. – Abdul Yasin Jun 23 '14 at 07:24

score 2 · Accepted Answer · answered Nov 28 '12 at 10:29

The idea behind background tasks is to prevent applications from continuously running in the background. In other words, if you try to bypass the restrictions that Apple has put into place then they have ground to reject your application.

The question whether they will do this can only be answered by Apple. However, as Daij-Djan mentions, there are other situations in which your application can get killed.

A few months ago, I faced a similar situation, that is, an application had to upload large files to an S3 bucket. The solution is using multipart uploads to make sure that the upload process is resumed whenever your application becomes active. You can read more about multipart uploads in the API reference.

i think the idea is clear.Dont push the system too much. – Xcoder Dec 05 '12 at 08:34 — Xcoder, Dec 05 '12 at 08:34

Extending Background Task timeout period while uploading Large videos iOS

2 Answers2