iOS crash on Starting Background Task

Question

I've recently revisited my app which was last built for iOS 8.4 and now updating it to 9.3. It was working fine the first few times I ran it but now crashes on every open, across each simulator with the error: EXC_BAD_ACCESS(code=50)

-(void)beginBackgroundUpdateTask
{
  if (self.backgroundTaskAgent == UIBackgroundTaskInvalid)
   {
     self.backgroundTaskAgent = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^(void) {
        [self endBackgroundUpdateTask];
     }];
   }
}
-(void)endBackgroundUpdateTask
{
    if (self.backgroundTaskAgent != UIBackgroundTaskInvalid)
    {
        [[UIApplication sharedApplication] endBackgroundTask:self.backgroundTaskAgent];
        self.backgroundTaskAgent = UIBackgroundTaskInvalid;
    }
}

The crash occurs in the top method with beginBackgroundTaskWithExpirationHandler. I've never had this error before and can't find any solution to it myself or on SO.

score 0 · Accepted Answer · answered Jul 25 '16 at 13:49

0

Try like this,

 -(void)beginBackgroundUpdateTask
{
  self.backgroundTaskAgent == UIBackgroundTaskInvalid

  self.backgroundTaskAgent = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^(void) {
    [self endBackgroundUpdateTask];
 }];

}
 -(void)endBackgroundUpdateTask
{

    [[UIApplication sharedApplication] endBackgroundTask:self.backgroundTaskAgent];
    self.backgroundTaskAgent = UIBackgroundTaskInvalid;

 }

answered Jul 25 '16 at 13:49

Ketan Parmar

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Fantastic, that fixed it thanks very much. What was causing the error then? – Gordon McKee Jul 25 '16 at 14:11
your bg task must be invalidate before begin it again! – Ketan Parmar Jul 25 '16 at 18:44

iOS crash on Starting Background Task

1 Answers1