ff9c3a57b0
“Offline pack” more effectively communicates the persistent nature of the downloaded content.
209 lines
6.8 KiB
Objective-C
209 lines
6.8 KiB
Objective-C
#import <Foundation/Foundation.h>
|
||
|
||
#import "MGLOfflineRegion.h"
|
||
|
||
NS_ASSUME_NONNULL_BEGIN
|
||
|
||
@protocol MGLOfflinePackDelegate;
|
||
|
||
/**
|
||
The state an offline pack is currently in.
|
||
*/
|
||
typedef NS_ENUM (NSInteger, MGLOfflinePackState) {
|
||
/**
|
||
It is unknown whether the pack is inactive, active, or complete.
|
||
|
||
This is the initial state of a pack that is obtained using the
|
||
`-[MGLOfflineStorage getPacksWithCompletionHandler:]` method. The state
|
||
becomes known by the time the pack’s delegate receives its first progress
|
||
update. For inactive packs, you must explicitly request a progress update
|
||
using the `-[MGLOfflinePack requestProgress]` method.
|
||
|
||
An invalid pack always has a state of `MGLOfflinePackStateInvalid`, never
|
||
`MGLOfflinePackStateUnknown`.
|
||
*/
|
||
MGLOfflinePackStateUnknown = 0,
|
||
/**
|
||
The pack is incomplete and is not currently downloading.
|
||
|
||
This is the initial state of a pack that is created using the
|
||
`-[MGLOfflinePack addPackForRegion:withContext:completionHandler:]` method,
|
||
as well as after the `-[MGLOfflinePack suspend]` method is
|
||
called.
|
||
*/
|
||
MGLOfflinePackStateInactive = 1,
|
||
/**
|
||
The pack is incomplete and is currently downloading.
|
||
|
||
This is the state of a pack after the `-[MGLOfflinePack resume]` method is
|
||
called.
|
||
*/
|
||
MGLOfflinePackStateActive = 2,
|
||
/**
|
||
The pack has downloaded to completion.
|
||
*/
|
||
MGLOfflinePackStateComplete = 3,
|
||
/**
|
||
The pack has been removed using the
|
||
`-[MGLOfflineStorage removePack:withCompletionHandler:]` method. Sending
|
||
any message to the pack will raise an exception.
|
||
*/
|
||
MGLOfflinePackStateInvalid = 4,
|
||
};
|
||
|
||
/**
|
||
A structure containing information about an offline pack’s current download
|
||
progress.
|
||
*/
|
||
typedef struct MGLOfflinePackProgress {
|
||
/**
|
||
The number of resources that have been completely downloaded and are ready
|
||
to use offline.
|
||
*/
|
||
uint64_t countOfResourcesCompleted;
|
||
/**
|
||
The cumulative size of the downloaded resources on disk, measured in bytes.
|
||
*/
|
||
uint64_t countOfBytesCompleted;
|
||
/**
|
||
The minimum number of resources that must be downloaded in order to view
|
||
the pack’s full region without any omissions.
|
||
|
||
At the beginning of a download, this count is a lower bound; the number of
|
||
expected resources may increase as the download progresses.
|
||
*/
|
||
uint64_t countOfResourcesExpected;
|
||
/**
|
||
The maximum number of resources that must be downloaded in order to view
|
||
the pack’s full region without any omissions.
|
||
|
||
At the beginning of a download, when the exact number of required resources
|
||
is unknown, this field is set to `UINT64_MAX`. Thus this count is always an
|
||
upper bound.
|
||
*/
|
||
uint64_t maximumResourcesExpected;
|
||
} MGLOfflinePackProgress;
|
||
|
||
/**
|
||
An `MGLOfflinePack` represents a collection of resources necessary for viewing
|
||
a region offline to a local database. It provides an optional
|
||
`MGLOfflinePackDelegate` object with progress updates as data or errors arrive
|
||
from the server.
|
||
*/
|
||
@interface MGLOfflinePack : NSObject
|
||
|
||
/**
|
||
The region for which the pack manages resources.
|
||
*/
|
||
@property (nonatomic, readonly) id <MGLOfflineRegion> region;
|
||
|
||
/**
|
||
Arbitrary data stored alongside the downloaded resources.
|
||
|
||
The context typically holds application-specific information for identifying
|
||
the pack, such as a user-selected name.
|
||
*/
|
||
@property (nonatomic, readonly) NSData *context;
|
||
|
||
/**
|
||
The pack’s current state.
|
||
|
||
The state of an inactive or completed pack is computed lazily and is set to
|
||
`MGLOfflinePackStateUnknown` by default. If you need the state of a pack
|
||
inside an `MGLOfflinePackListingCompletionHandler`, set the `delegate` property
|
||
then call the `-requestProgress` method.
|
||
*/
|
||
@property (nonatomic, readonly) MGLOfflinePackState state;
|
||
|
||
/**
|
||
The pack’s current progress.
|
||
|
||
The progress of an inactive or completed pack is computed lazily, and all its
|
||
fields are set to 0 by default. If you need the progress of a pack inside an
|
||
`MGLOfflinePackListingCompletionHandler`, set the `delegate` property then call
|
||
the `-requestProgress` method.
|
||
*/
|
||
@property (nonatomic, readonly) MGLOfflinePackProgress progress;
|
||
|
||
/**
|
||
The pack’s delegate.
|
||
|
||
You can use the offline pack delegate to be notified of any changes in the
|
||
pack’s progress and of any errors while downloading. For more information, see
|
||
the `MGLOfflinePackDelegate` documentation.
|
||
*/
|
||
@property (nonatomic, weak, nullable) id <MGLOfflinePackDelegate> delegate;
|
||
|
||
- (instancetype)init NS_UNAVAILABLE;
|
||
|
||
/**
|
||
Resumes downloading if the pack is inactive.
|
||
*/
|
||
- (void)resume;
|
||
|
||
/**
|
||
Temporarily stops downloading if the pack is active.
|
||
|
||
To resume downloading, call the `-resume` method.
|
||
*/
|
||
- (void)suspend;
|
||
|
||
/**
|
||
Request an asynchronous update to the pack’s `state` and `progress` properties.
|
||
|
||
The state and progress of an inactive or completed pack are computed lazily. If
|
||
you need the state or progress of a pack inside an
|
||
`MGLOfflinePackListingCompletionHandler`, set the `delegate` property then call
|
||
this method.
|
||
*/
|
||
- (void)requestProgress;
|
||
|
||
@end
|
||
|
||
/**
|
||
The `MGLOfflinePackDelegate` protocol defines methods that a delegate of an
|
||
`MGLOfflinePack` object can optionally implement to be notified of any changes
|
||
in the pack’s download progress and of any errors while downloading.
|
||
*/
|
||
@protocol MGLOfflinePackDelegate <NSObject>
|
||
|
||
@optional
|
||
|
||
/**
|
||
Sent whenever the pack’s state or download progress changes. Every change to a
|
||
field in the `progress` property corresponds to an invocation of this method.
|
||
|
||
@param pack The pack whose state of progress changed.
|
||
@param progress The updated progress. To get the updated state, refer to the
|
||
`state` property.
|
||
*/
|
||
- (void)offlinePack:(MGLOfflinePack *)pack progressDidChange:(MGLOfflinePackProgress)progress;
|
||
|
||
/**
|
||
Sent whenever the pack encounters an error while downloading.
|
||
|
||
Download errors may be recoverable. For example, this pack’s implementation may
|
||
attempt to re-request failed resources based on an exponential backoff
|
||
strategy or upon the restoration of network access.
|
||
|
||
@param pack The pack that encountered an error.
|
||
@param error A download error. For a list of possible error codes, see
|
||
`MGLErrorCode`.
|
||
*/
|
||
- (void)offlinePack:(MGLOfflinePack *)pack didReceiveError:(NSError *)error;
|
||
|
||
/**
|
||
Sent when the maximum number of Mapbox-hosted tiles has been downloaded and
|
||
stored on the current device.
|
||
|
||
Once this limit is reached, no instance of `MGLOfflinePack` can download
|
||
additional tiles from Mapbox APIs until already downloaded tiles are removed by
|
||
calling the `-[MGLOfflineStorage removePack:withCompletionHandler:]` method.
|
||
Contact your Mapbox sales representative to have the limit raised.
|
||
*/
|
||
- (void)offlinePack:(MGLOfflinePack *)pack didReceiveMaximumAllowedMapboxTiles:(uint64_t)maximumCount;
|
||
|
||
@end
|
||
|
||
NS_ASSUME_NONNULL_END
|