OnRegionChangeComplete always returns to initialRegion

[sagi]

Bug

onRegionChangeComplete event resets back to initialRegion.

It happens on iOS while using Google Maps (PROVIDER_GOOGLE).

Example (video):

Reproduction

First we'll need a copy of the master branch, lets call it blaster:

$ git checkout -b blaster master

Now to make it compile (master is broken) we'll have to "cherry pick" the following PRs:

• Zoom level fixes #1485 by @Benjamin-Dobell.

Apply it to the blaster branch with:

$ curl https://github.com/airbnb/react-native-maps/commit/e580b706cfed4d7dac8fc2d6bb7d81f5cd3392e5.patch | git am

• Remove caret from "react": "^16.0.0-alpha.12" #1503 by myself.

$ curl https://github.com/airbnb/react-native-maps/commit/32350e26cf7c2be6031dbabf23b8e27cd7269c00.patch | git am

Now simply:

$ rm -rf node_modules
$ npm install

And,

$ npm run build:ios && npm run run:ios

[foyarash]

Same here using MapKit

[foyarash]

The problem seems to come from the setInitialRegion function which is never called.

I tried a workaround like this in the AIRMapManager.m

RCT_CUSTOM_VIEW_PROPERTY(initialRegion, MKCoordinateRegion, AIRMap)
{
if (json == nil) return;

// don't emit region change events when we are setting the region
BOOL originalIgnore = view.ignoreRegionChanges;
view.ignoreRegionChanges = YES;
[view setInitialRegion:[RCTConvert MKCoordinateRegion:json]];
view.ignoreRegionChanges = originalIgnore;
}

but it does not work, json variable is nil and I don't know why. I'm not an ObjC developer, so some help would be appreciated :)