An MGLOfflinePackProgressChangedNotification notification now includes the pack’s state and progress values, which match the values in the corresponding MGLOfflinePack properties. Implemented NSValue category methods to store MGLOfflinePackProgress inside a dictionary.
Made MGLOfflineStorage.packs strong rather than copy so that KVO notifications on that key path include index paths. Replaced custom KVO mutable collection methods with calls to -mutableArrayValueForKey:, avoiding redundant casts.
Privatized MGLOfflinePackDelegate and made its methods required, since MGLOfflineStorage is the only conforming implementation. Require a pack to be explicitly invalidated before deallocation by its owner (MGLOfflineStorage). Added a method to reload the canonical collection of packs.
Previously, if the user adds an offline pack without specifying a name in the alert, the pack would be named “Untitled n” for the nth pack created since the application was launched. This logic could result in identically named packs (for example, if the user relaunches and creates another unnamed pack). Instead, use the visible coordinate bounds as a placeholder and fallback name.
Resume a pack upon successful addition. Removed an extraneous weakSelf/strongSelf dance. When possible, update individual labels in a cell instead of reloading the entire cell. That way, if the user swipes to the left to reveal the Delete accessory button while the pack is actively downloading, the accessory button remains on screen as progress updates come in.
MGLOfflineStorage now maintains a centralized, strongly held, KVO-compliant collection of all extant offline packs. MGLOfflineStorage issues notifications for progress updates. Client code can now react to the successful addition of an offline pack either via the completion block or via a KVO insertion.
Fixes#4287.
Also categorized offline symbols for jazzy and moved styleURL from MGLOfflineRegion to MGLTilePyramidOfflineRegion, since you never know if there will be a region type not constrained by a style in the future.
Renamed SDK classes related to offline viewing to more closely match the terminology used by mbgl and the Android SDK while remaining consistent with Cocoa naming principles.
