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POUsing multiple beginBackgroundTaskWithExpirationHandler calls
 

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  1. POUsing multiple beginBackgroundTaskWithExpirationHandler calls
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    <p>I am trying to follow this previous post here: <a href="https://stackoverflow.com/questions/3928861/best-practice-to-send-a-lot-of-data-in-background-on-ios4-device">Best practice to send a lot of data in background on iOS4 device?</a></p> <p>And basically, I have a method called getRequest that grabs information from the web server. There are about 50 pieces of data I need from the web server. So at the same time, I have 50 delegate calls to connectionDidFinishLoading. Currently my getRequest looks like:</p> <pre><code>-(void) getRequestWithURL:(NSString *) requestURL { static int getRequest = 0; NSLog(@"getRequest: %i", getRequest); getRequest++; UIApplication *app = [UIApplication sharedApplication]; __block UIBackgroundTaskIdentifier taskID; taskID = [app beginBackgroundTaskWithExpirationHandler:^{ NSLog(@"Time remaining: %f", app.backgroundTimeRemaining); NSLog(@"Background task not completed"); [app endBackgroundTask:taskID]; }]; NSURLRequest *req = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:requestURL]]; NSURLConnection *con = [[NSURLConnection alloc] initWithRequest:req delegate:self] ; [self startRequestWithConnection:con]; [req release]; if (taskID == UIBackgroundTaskInvalid) { NSLog(@"Failed to create background task identifier"); } } </code></pre> <p>Then in my connectionDidFinishLoading:</p> <pre><code>- (void)connectionDidFinishLoading:(NSURLConnection *)connection { // process data from server // endBackgroundTask:someTaskID??? } </code></pre> <p>I know you are allowed to have multiple calls of beginBackgroundTaskWithExpirationHandler, but I don't know if what I'm doing in my getRequest method is doing that since I only have one variable <code>__block UIBackgroundTaskIdentifier taskID</code> each time the method is called. And I'm also not sure if I need to call endBackgroundTask in the connectionDidFinishLoading method for each call to getRequest since you are supposed to balance the beginBackgroundTaskWithExpirationHandler with an endBackgroundTask: call. If so, how do I do that since my getRequest doesn't currently have that infrastructure? Do I need 50 ivars in order for the connectionDidFinishLoading method to see the 50 initial calls to getRequest? Thanks.</p>
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    1. COWhat is the task here? backgroundTaskID = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{ [[UIApplication sharedApplication] endBackgroundTask:backgroundTaskID]; backgroundTaskID = UIBackgroundTaskInvalid; }]; This simply returns a background-id, but where is the actual method call being made?
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