ideally, you never have to check for that setting. It looks as though you are going around background fetching the wrong way. With the application minimised, the system will periodically wake your application up and allow it to perform tasks. From your code , you want to update the location. first place to start is here , using this delegate method that gets called when the app is woken up for a background fetch
/// Applications with the "fetch" background mode may be given opportunities to fetch updated content in the background or when it is convenient for the system. This method will be called in these situations. You should call the fetchCompletionHandler as soon as you're finished performing that operation, so the system can accurately estimate its power and data cost.
- (void)application:(UIApplication *)application performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult result))completionHandler NS_AVAILABLE_IOS(7_0);
this is how you use it, in your application delegate implementation, define the method body as follows
-(void)application:(UIApplication *)application performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
NSLog(@"APP IS AWAKE FOR A BACKGROUND FETCH");
//do all the work you want to do
//once done, its important to call the completion hadler, otherwise the system will complain
completionHandler(UIBackgroundFetchResultNewData);
}
however, since you are updating the location, which has its own delegates, you only want the completion handler to be called when your delegates return and not before that. Calling the completion handler will send your application back to sleep. Since the completion handler is a block object, it can be passed around like any other object. One way of doing that is as follows: in the application delegate header file, define a block object:
void (^fetchCompletionHandler)(UIBackgroundFetchResult);
then in your performFetchWithCompletionHandler have :
-(void)application:(UIApplication *)application performFetchWithCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
fetchCompletionHandler = completionHandler;
NSLog(@"APP IS AWAKE FOR A BACKGROUND FETCH");
//do all the work you want to do
[self.locationManager startUpdatingLocation];
}
at some appropriate time, after your location delegate methods have returned, you call
fetchCompletionHandler (UIBackgroundFetchResultNewData);
be sure to check if your fetchCompletionHandler is non nill, calling it when nil will immediately crash your app. read more on blocks from the apple docs here https://developer.apple.com/library/ios/documentation/cocoa/conceptual/ProgrammingWithObjectiveC/WorkingwithBlocks/WorkingwithBlocks.html
also have a look at the call [[UIApplication sharedApplication] setMinimumBackgroundFetchInterval: ]; which Specifies the minimum amount of time that must elapse between background fetch operations.
You would probably chuck that into your app delegate application didFinishLaunchingWithOptions method.
hopefully this helps you.
