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#import "OfflinePackExample.h"
@import Mapbox;
NSString *const MBXExampleOfflinePack = @"OfflinePackExample";
@interface OfflinePackExample () <MGLMapViewDelegate>
@property (nonatomic) MGLMapView *mapView;
@property (nonatomic) UIProgressView *progressView;
@end
@implementation OfflinePackExample
- (void)viewDidLoad {
[super viewDidLoad];
self.mapView = [[MGLMapView alloc] initWithFrame:self.view.bounds styleURL:[MGLStyle darkStyleURLWithVersion:9]];
self.mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
self.mapView.tintColor = [UIColor lightGrayColor];
self.mapView.delegate = self;
[self.view addSubview:self.mapView];
[self.mapView setCenterCoordinate:CLLocationCoordinate2DMake(22.27933, 114.16281)
zoomLevel:13
animated:NO];
// Setup offline pack notification handlers.
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(offlinePackProgressDidChange:) name:MGLOfflinePackProgressChangedNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(offlinePackDidReceiveError:) name:MGLOfflinePackErrorNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(offlinePackDidReceiveMaximumAllowedMapboxTiles:) name:MGLOfflinePackMaximumMapboxTilesReachedNotification object:nil];
}
- (void)mapViewDidFinishLoadingMap:(MGLMapView *)mapView {
// Start downloading tiles and resources for z13-16.
[self startOfflinePackDownload];
}
- (void)dealloc {
// Remove offline pack observers.
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
- (void)startOfflinePackDownload {
// Create a region that includes the current viewport and any tiles needed to view it when zoomed further in.
// Because tile count grows exponentially with the maximum zoom level, you should be conservative with your `toZoomLevel` setting.
id <MGLOfflineRegion> region = [[MGLTilePyramidOfflineRegion alloc] initWithStyleURL:self.mapView.styleURL bounds:self.mapView.visibleCoordinateBounds fromZoomLevel:self.mapView.zoomLevel toZoomLevel:16];
// Store some data for identification purposes alongside the downloaded resources.
NSDictionary *userInfo = @{ @"name": @"My Offline Pack" };
NSData *context = [NSKeyedArchiver archivedDataWithRootObject:userInfo];
// Create and register an offline pack with the shared offline storage object.
[[MGLOfflineStorage sharedOfflineStorage] addPackForRegion:region withContext:context completionHandler:^(MGLOfflinePack *pack, NSError *error) {
if (error != nil) {
// The pack couldn’t be created for some reason.
NSLog(@"Error: %@", error.localizedFailureReason);
} else {
// Start downloading.
[pack resume];
}
}];
}
#pragma mark - MGLOfflinePack notification handlers
- (void)offlinePackProgressDidChange:(NSNotification *)notification {
MGLOfflinePack *pack = notification.object;
// Get the associated user info for the pack; in this case, `name = My Offline Pack`
NSDictionary *userInfo = [NSKeyedUnarchiver unarchiveObjectWithData:pack.context];
MGLOfflinePackProgress progress = pack.progress;
// or [notification.userInfo[MGLOfflinePackProgressUserInfoKey] MGLOfflinePackProgressValue]
uint64_t completedResources = progress.countOfResourcesCompleted;
uint64_t expectedResources = progress.countOfResourcesExpected;
// Calculate current progress percentage.
float progressPercentage = (float)completedResources / expectedResources;
// Setup the progress bar.
if (!self.progressView) {
self.progressView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault];
CGSize frame = self.view.bounds.size;
self.progressView.frame = CGRectMake(frame.width / 4, frame.height * 0.75, frame.width / 2, 10);
[self.view addSubview:self.progressView];
}
[self.progressView setProgress:progressPercentage animated:YES];
// If this pack has finished, print its size and resource count.
if (completedResources == expectedResources) {
NSString *byteCount = [NSByteCountFormatter stringFromByteCount:progress.countOfBytesCompleted countStyle:NSByteCountFormatterCountStyleMemory];
NSLog(@"Offline pack “%@” completed: %@, %llu resources", userInfo[@"name"], byteCount, completedResources);
} else {
// Otherwise, print download/verification progress.
NSLog(@"Offline pack “%@” has %llu of %llu resources — %.2f%%.", userInfo[@"name"], completedResources, expectedResources, progressPercentage * 100);
}
}
- (void)offlinePackDidReceiveError:(NSNotification *)notification {
MGLOfflinePack *pack = notification.object;
NSDictionary *userInfo = [NSKeyedUnarchiver unarchiveObjectWithData:pack.context];
NSError *error = notification.userInfo[MGLOfflinePackUserInfoKeyError];
NSLog(@"Offline pack “%@” received error: %@", userInfo[@"name"], error.localizedFailureReason);
}
- (void)offlinePackDidReceiveMaximumAllowedMapboxTiles:(NSNotification *)notification {
MGLOfflinePack *pack = notification.object;
NSDictionary *userInfo = [NSKeyedUnarchiver unarchiveObjectWithData:pack.context];
uint64_t maximumCount = [notification.userInfo[MGLOfflinePackUserInfoKeyMaximumCount] unsignedLongLongValue];
NSLog(@"Offline pack “%@” reached limit of %llu tiles.", userInfo[@"name"], maximumCount);
}
@end
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