CODEWITHSUNDEEP
iosobjective-ciphone
Romain
Romain

Reputation: 1445

Incorrect backgroundTimeRemaining value in applicationDidEnterBackground method

I am working on a Objective C project on Xcode6 beta 2 running on an iOS8 device. I am printing the backgroundTimeRemaining in the method: applicationDidEnterBackground.

- (void)applicationDidEnterBackground:(UIApplication *)application
{
  NSLog:(@"Background time remaining %f seconds", application.backgroundTimeRemaining);
  NSLog:(@"Background time remaining %f seconds", application.backgroundTimeRemaining);
  NSLog:(@"Background time remaining %f seconds", application.backgroundTimeRemaining);
}

The results I received were:

179769313486231570814527423731704356798070567525844996598917476803157260780028538760589558632766878171540458953514382464234321326889464182768467546703537516986049910576551282076245490090389328944075868508455133942304583236903222948165808559332123348274797826204144723168738177180919299881250404026184124858368.000000 seconds

9.995252 seconds

9.991967 seconds

Why does it output this big value on the first log (1797693...) ?

Thanks

Upvotes: 6

Views: 553

Answers (2)

Will Ullrich
Will Ullrich

Reputation: 2228

The backgroundTimeRemaining will return to you a NSTimeInterval, which is really just a double value.

I believe therefore, before it can register the time interval (it is returning to you the remaining time "too quickly") it will give you the maximum value that a double can represent. 

The `double` data type gives a range of approximately 1.7E–308 to 1.7E+308 for type double.

...which is why you are getting that ridiculously lengthy value.

Happy coding! :)

Upvotes: 0

Romain
Romain

Reputation: 1445

I found out a quick and dirty fix that seems to work. Make the thread sleep a bit before requesting applicationTimeRemaning:

- (void)applicationDidEnterBackground:(UIApplication *)application
{
  [NSThread sleepForTimeInterval:.01];
  NSLog:(@"Background time remaining %f seconds", application.backgroundTimeRemaining);
}

But this is obviously not an ideal solution.

Upvotes: 1

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