Need to look in the main bundle for Info.plist settings, because the developer has no access to the framework’s Info.plist. Need to check MGLMapboxMetricsEnabledSettingShownInApp before MGLMapboxAccessToken; otherwise, `MGLMapboxEvents` inspects the Settings bundle plist before MGLMapboxMetricsEnabledSettingShownInApp is even checked.
The singleton `MGLAccountManager` wants to be the sole arbiter of the access token, but each instance of `mbgl::Map` (`mbgl::DefaultFileSource` in #1607) has its own copy of the access token. Now `MGLMapView` observes for changes to the `MGLAccountManager`’s access token and synchronizes `mbgl::Map` with it.
`-pauseMetricsCollection` and `-resumeMetricsCollection` were originally introduced to mitigate concerns around battery usage, but `MGLMapboxEvents` has since evolved to tread much lighter on the battery. There’s no longer any need for the client to call these methods directly. The iOS test project now includes MGLMapboxEvents.h explicitly to avoid having to package a header that will go unused.
A typo in a selector literal meant that `-[MGLMapViewDelegate mapViewDidFailLoadingMap:withError:]` would never be sent to delegates even if `MGLMapView` had called it. Along for the ride, create a proper `NSError` to pass into that callback, and an error domain for that error.
`MGLAccountManager` is now guaranteed to initialize without the code ever making any mention of it. It also is guaranteed to be set up before `MGLMapboxMetrics` but will definitely cause `MGLMapboxMetrics` to be set up on the main thread if the access token is set in Info.plist.
That way there’s no ambiguity about when you should call things like `+[MGLAccountManager setMapboxMetricsEnabledSettingShownInApp:]`. In fact, that method is now deprecated because it’s so easy to call in the wrong place.
Fixes#1535.
Enable Mapbox Metrics by default when Settings.bundle is absent, but allow Settings.bundle to override the default. Don’t register defaults for non-Mapbox preferences. The two-phase registration ensures that the defaults don’t default to unexpected values, yet gives the developer a chance to call `+[MGLAccountManager mapboxMetricsEnabledSettingShownInApp]` before the hard assertion.
Fixes#1518.
`MGLMapboxEvents` automatically recreates its location manager when the host app is reauthorized for Location Services. Added some redundancy to ensure that there is no location manager when either Location Services or Mapbox Metrics is off.
As soon as the user returns to the host app after changing the opt-out preference in Settings, `MGLMapboxEvents` responds by pausing or resuming. Also moved the IB designables agent check to occur only once, at launch, since the process name is not expected to change mid-session.
Moved constant values from ivars into constants. Invalidate the flush timer and clear the event queue on pause. Rewrote some flush logic to be easier to follow.
The shared `MGLMapboxEvents` now owns the only instance of `MGLMetricsLocationManager`. It also owns a `MGLMapboxEventsData` object, to which all user-specific data has been relegated. This object can be built up and torn down on the fly, whenever the opt-out preference is toggled. `MGLMapboxEvents` has also given up knowledge of the access token and now queries `MGLAccountManager` for that information, which `MGLMapView` keeps up-to-date.
