RMTileCache后台缓存永远不会达到totalTiles计数，也永远不会告诉委托它已经完成

Question

我正在使用MapBox和RMTileCache的beginBackgroundCacheForTileSource:在我的客户端应用程序中渲染地图之前预先加载tiles。我想为地图上当前可见的区域预加载从缩放级别3到缩放级别7的瓦片。因此，我使用从mapView latitudeLongitudeBoundingBox返回的mapView传递当前的边界。我的ViewController实现了RMTileCacheBackgroundDelegate，以便在缓存发生后完成时获得回调。我确实收到了didBeginBackgroundCacheWithCount:forTileSource:和didBackgroundCacheTile:withIndex:ofTotalTileCount:上的回调，但是，从来没有调用过tileCacheDidFinishBackgroundCache：。

我浏览了RMTileCache的源代码，注意到"progTile“中缓存的磁贴的实际数量从未达到"totalTiles”中计算出的总数量。因此，没有到达最终的回调tileCacheDidFinishBackgroundCache：。

我不确定如何更改(或者是否应该更改) totalTiles计算。也许我在最初的调用中传递了错误的视图rect？我不完全清楚这是否正确。我可以创建一个简单的修复程序，调用tileCacheDidFinishBackgroundCache:在缓存简单完成的情况下，但这似乎只是隐藏了问题。这里的任何指导都将不胜感激。

作为参考，我的测试代码很简单：

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    RMMapboxSource *onlineSource = [[RMMapboxSource alloc] initWithMapID:@"appleweed.control-room"];
    mapView = [[RMMapView alloc] initWithFrame:self.view.bounds andTilesource:onlineSource];
    //mapView.delegate = self;
    mapView.bouncingEnabled = YES;
    mapView.clusteringEnabled = YES;
    mapView.clusterMarkerSize = CGSizeMake(40, 40);
    mapView.clusterAreaSize = CGSizeMake(40, 40);
    mapView.zoom = 1;

    RMSphericalTrapezium rect = [mapView latitudeLongitudeBoundingBox];
    mapView.tileCache.backgroundCacheDelegate = self;
    [mapView.tileCache beginBackgroundCacheForTileSource:mapView.tileSource
    southWest:rect.southWest
    northEast:rect.northEast
    minZoom:3.0
    maxZoom:7.0];

}

- (void)tileCache:(RMTileCache *)tileCache didBeginBackgroundCacheWithCount:(int)tileCount forTileSource:(id <RMTileSource>)tileSource {

    NSLog(@"start");

}

- (void)tileCache:(RMTileCache *)tileCache didBackgroundCacheTile:(RMTile)tile withIndex:(int)tileIndex ofTotalTileCount:(int)totalTileCount {

   // float percentComplete = ((float)tileIndex / (float)totalTileCount) * 100;
    //NSString *update = [NSString stringWithFormat:@"%.0f%%", percentComplete];
    //NSLog(@"%@",update);

}

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

    NSLog(@"DONE!");

}

- (void)tileCacheDidCancelBackgroundCache:(RMTileCache *)tileCache {

    NSLog(@"Canceled!");

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

Answer 1

它是否每次都在相同的瓦片计数处停止？是否有地图视图同时可见？如果你在调试器中暂停你的应用程序，一旦它在后台似乎停止了下载磁贴，它会做什么？