Expose a method to set allowsBackgroundLocationUpdates

[bruz]

Enabling this appears to be necessary in order to have location updates fire when the app is backgrounded, when linking against iOS 9. From the docs:

Apps that want to receive location updates when suspended must include the UIBackgroundModes key (with the location value) in their app’s Info.plist file and set the value of this property to YES. The presence of the UIBackgroundModes key with the location value is required for background updates; you use this property to enable and disable the behavior based on your app’s behavior. For example, you might set the value to YES only after the user enables features in your app where background updates are needed.

When the value of this property is NO, apps receive location updates normally while running in either the foreground or background based on its current authorization. Updates stop only when the app is suspended, thereby preventing the app from being woken up to handle those events.

The default value of this property is NO. Setting the value to YES but omitting the UIBackgroundModes key and location value in your app’s Info.plist file is a programmer error.

[timfpark]

Thanks! One thing though: I think this facebook/react-native#1282 might mean that despite this, you will not get events. There might be a fix in 0.14 for this but I haven't had time to verify yet.

[bruz]

Just as a follow up for anyone else happening across this, I've played with this quite a bit now and can confirm that locationUpdated events do fire when monitoring for significant location changes and the app is backgrounded. The amount of work you can get done in response to it does seem quite limited before the javascript thread pauses again though.

[timfpark]

That's great news @bruz - thanks for the update - which version of react-native did you verify that with?

[bruz]

Ah, right, forgot to mention that part. I did indeed have issues with react native 0.13, but with 0.15 it's working.