将 Route me 在线图块下载到数据库中

Question

在 iPhone osm 地图应用程序（Route me）上工作。初始化和下载在线地图很容易，但真正的问题在于在线时通过代码保存图块并在离线时重用它们。我查看了有关一样，但每个人都在外部保存图像并将其导入项目然后显示它们，这不是我的要求。请帮助我保存我从在线资源中选择的平铺图像路线

 here is how i am using online route me maps


 -(void) viewDidLoad
 {
    [RMMapView class];
     mapView.contents.tileSource = [[RMOpenStreetMapSource alloc] init];

    currentMarker = [[RMMarker alloc]initWithUIImage:[UIImage             imageNamed:@"radarLocatorLite.png"] anchorPoint:CGPointMake(0.5, 0.5)];
     markerManager   = [mapView markerManager];


     locationManager.delegate=self;
     locationManager.desiredAccuracy = kCLLocationAccuracyBest ;
     locationManager.distanceFilter =0;

    [mapView.contents  setZoom:17.0f];
    [markerManager addMarker:currentMarker AtLatLong:currentLocation.coordinate];
    [self initCompassView];
     [locationManager startUpdatingLocation];
     [locationManager startUpdatingHeading];

 }

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
    currentLocation =newLocation;

        [mapView moveToLatLong:newLocation.coordinate];



    [markerManager moveMarker:currentMarker AtLatLon: newLocation.coordinate];

        [currentRoutePath addLineToLatLong:newLocation.coordinate];
        [[mapView.contents overlay] addSublayer:currentRoutePath];
       //  NSLog(@"i reached  inside location update%f",currentRoutePath.lineWidth);

    }

Answer 1

我有一个 iOS 应用程序，它使用保存在 sqlite 数据库中的静态地图图像。有一些关于如何做到这一点的参考资料，但我花了很多时间试错才能理解它们并使其发挥作用。

似乎您应该能够拥有一个 sqlite 数据库，并在您的应用程序下载它们时将下载的图像保存到其中。然后你必须知道要使用什么 tile 源：如果应用程序离线，则使用 sqlite 数据库，在线时使用 OSM 站点。

数据库的结构是：
tilekey text // route-me 用来定位正确图块的哈希值 缩放整数
行整数
col 整数
缩放整数
图像 blob 存储地图的实际图像

我使用 Python 脚本来填充数据库，因为我希望应用始终使用数据库中的静态地图图像，而不是使用 OSM 的实时下载。

如果您想了解更多信息，请告诉我，但如果您使用 route-me 搜索使用静态地图，您应该会找到这是如何完成的。祝你好运！

Answer 2

finally resolved problem by just a minor change in few places

Step 1: Go to this site "http://shiki.me/blog/offline-maps-in-ios-using-openstreetmap-and-route-me/" and follow instructions to download tile images from online and create of zip of the folder.remember the tile images folder are in order ->zoom level folder->x coord foler->y coord image respectively.

step 2: unzip the zip file in ur app at some folder

step 3:go to the file "RMAbstractMercatorWebSource.m" in map view project
and replace the following folders 
-(NSString*) tileFile: (RMTile) tile
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"Tiles"];
    NSString *absPath=[NSString stringWithFormat:@"%@/%d/%d/%d.png", path,tile.zoom, tile.x, tile.y];
    NSLog(@"file path >>>.............%@",absPath);
    return absPath;
}//I unzipped the zip file at tiles folder 

-(NSString*) tilePath
{
    return nil;
}

-(RMTileImage *)tileImage:(RMTile)tile
{
    RMTileImage *image;

    tile = [tileProjection normaliseTile:tile];

    NSString *file = [self tileFile:tile];

    if(file && [[NSFileManager defaultManager] fileExistsAtPath:file])
    {
        image = [RMTileImage imageForTile:tile fromFile:file];
    }
    else if(networkOperations) 
    {
        image = [RMTileImage imageForTile:tile withURL:[self tileURL:tile]];     
    }
    else
    {
        image = [RMTileImage dummyTile:tile];
    }

    return image;
}
this in turns first look in cache then check the specified directory and finally go for online osm tile images