Summary:
Allow changing distanceFilter after _locationManager has been initialized.
There is 2 reasons for this PR:
- When calling `getCurrentPosition`, `_observerOptions` is possibly not set properly ( as it is set only in `startObserving`), in this case it would have default values so `distanceFilter` will be 0 in this case ( which can be the right value but we should be more explicit about it, `kCLDistanceFilterNone` or `RCT_DEFAULT_LOCATION_ACCURACY`):
<img width="961" alt="screen shot 2016-04-14 at 8 44 09 pm" src="https://cloud.githubusercontent.com/assets/159813/14551465/6aa8791a-0288-11e6-9c98-1687357f8c2a.png">
- Another issue is that `distanceFilter` is cached so it can't be changed afterwards:
```javascript
let options;
options = {
enableHighAccuracy: true,
distanceFilter: 20,
};
this.watchId = this.geolocation.watchPosition(
() => { },
() => { },
options,
);
// => sets distanceFilter to 20
this.geolocation.clearWatch(this.watchId);
options = {
enableHighAccuracy:
Closes https://github.com/facebook/react-native/pull/6987
Differential Revision: D3258956
fb-gh-sync-id: 00a1d1b29d732a54cdc30e20a7a9a2de3dd9b725
fbshipit-source-id: 00a1d1b29d732a54cdc30e20a7a9a2de3dd9b725
2310494f32
