This new code can be used for rendering on the Main thread
while it will also work for rendering on the Map thread
before we make the switch. Needed by #2909.
Previously, the post of the turnstile event was a side effect of the
map.load event and would happen when the host app was started from a
terminated state at the first initialization of MGLMapView. The
turnstile event post was guarded with dispatch_once so that it would
only ever be sent once during the lifecycle of the application after
it started from the terminated state.
This changes that behavior by:
- Allowing a new turnstile event to be posted as much as once per
day
- Only triggering a map.view event when a map is initialized if the map
is loaded outside of the 'background' application state
- Sending a map.view event whenever a MGLMapView is instantiated
and the application did become active or enters foreground
iOS turnstile event sending behavior is now:
- A map.view event is generated whenever a map is loaded and also
when a map is shown again when the host app becomes active and moves
into the foreground
- Turnstile events are still triggered by mapviews and will be sent as
frequently as once per day for a host app that is not terminated and
also whenever a host app is terminated and restarted
w
There is now only one instance of mbgl::OfflineFileSource, created when the shared MGLOfflineStorage object is initialized. Also create and use the shared MGLOfflineStorage object when initializing an MGLMapView object. The unified cache file is located in a subdirectory of Application Support, where the SDK has control over the file’s lifetime. The subdirectory is already named after the host application’s bundle identifier, ensuring that each Mapbox-powered application has an independent tile limit. If there’s an ambient cache in a subdirectory of Caches, delete it. If there’s an offline cache in a subdirectory of Documents on iOS or Caches on OS X, move it to the unified cache location in a subdirectory of Application Support.
Fixes the iOS/OS X side of #4338.
