1 files changed, 113 insertions, 0 deletions
diff --git a/platform/ios/demo/Examples/ObjectiveC/OfflinePackExample.m b/platform/ios/demo/Examples/ObjectiveC/OfflinePackExample.m
new file mode 100644
index 0000000000..7640d6439f
--- /dev/null
+++ b/platform/ios/demo/Examples/ObjectiveC/OfflinePackExample.m
@@ -0,0 +1,113 @@
+#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