iOS: Adding options to use in long-running background tasks

[MrVonkey]

Hi,

i'm currently dealing with long-running background tasks on iOS. On iOS versions > 9.0 one can't receive location updates in background in combination with the UIBackgroundModes key location in the Info.plist, because the allowsBackgroundLocationUpdates flag has to be set to true on the used location manager instance (https://developer.apple.com/reference/corelocation/cllocationmanager/1620568-allowsbackgroundlocationupdates). Receiving location updates in background only works by using beginBackgroundTaskWithExpirationHandler, which suspends the background task after about 3 minutes,

Furthermore, long-running background tasks which consume location updates can be suspended if the location updates are paused by the location manager. This behavior can be deactivated by setting the pausesLocationUpdatesAutomatically flag of the location manager instance to false (https://developer.apple.com/reference/corelocation/cllocationmanager/1620553-pauseslocationupdatesautomatical).

It would be nice to have control over these location manager flags to use the plugin in long-running background tasks. Would it be possible to integrate these flags as options?

(tested on iOS 10.2.1)

[TLmaK0]

compile.sh lint returns:
source/nativescript-geolocation.ios.ts[327, 1]: Exceeds maximum line length of 120
source/nativescript-geolocation.ios.ts[330, 1]: Exceeds maximum line length of 120

[MrVonkey]

@TLmaK0 Thanks! I overlooked that.

[DimitarTachev]

Great job, @MrVonkey! Welcome to the geo locaiton contributors!

Sorry for the long silence and thanks for the detailed description! I made some README improvements and rebased the changes in order to resolve the conflicts. You could check the updated PR here.

The changes will be part of the 4.1.0 version of the plugin.