MapBox 缓存不工作

Question

我正在尝试在 MapBox 中缓存地图。当应用在线时，一切正常。正在正确调用 tileCacheDidFinishBackgroundCache。

然后，我离线重新启动应用程序。 RMMapView 只显示白色，而不是地图。

我的代码：

- (void)viewDidLoad
{
    [super viewDidLoad];
    [[RMConfiguration sharedInstance] setAccessToken:@"pk......"];

    RMTileCache  * tileCache = [[RMTileCache alloc] initWithExpiryPeriod:0];
    [tileCache setBackgroundCacheDelegate:self];

    tileSource = [[RMMapboxSource alloc] initWithMapID:@"mirap.ld8dbe2c"];    
    mapView = [[RMMapView alloc] initWithFrame:viewMapView.bounds
                                     andTilesource:tileSource];

    [mapView.tileSource setCacheable:YES];
    [viewMapView addSubview:mapView];
}


-(void)viewDidAppear:(BOOL)animated {
    RMSphericalTrapezium rect = [mapView latitudeLongitudeBoundingBox];
    mapView.tileCache.backgroundCacheDelegate = self;
    [mapView.tileCache beginBackgroundCacheForTileSource:mapView.tileSource
                                               southWest:rect.southWest
                                               northEast:rect.northEast
                                                 minZoom:10.0
                                                 maxZoom:20.0];

}
- (void)tileCacheDidFinishBackgroundCache:(RMTileCache *)tileCache {

    NSLog(@"DONE!");

}

Answer 1

这是您需要的：

mapbox-ios-sdk-offline/ViewController.swift#L38-L44

简而言之，用地图ID初始化瓦片源就是shorthand请求远程元数据URL。

-[RMMapboxSource initWithMapID:]

This method requires a network connection in order to download the TileJSON used to define the tile source.

相反，您还想缓存 tileSource.tileJSON 并在离线时使用它来初始化图块源。

-[RMMapboxSource tileJSON]

Useful for saving locally to use in instantiating a tile source while offline.

MapBox 缓存不工作

MapBox cache not working

objective-c

ios

mapbox