Creates a new [class@TileDownloader] that fetches tiles from an API and caches them on disk.
See [property@TileDownloader:url-template] for the format of the URL template.
a URL template to fetch tiles from
a newly constructed [class@TileDownloader]
ConstructionException GTK+ fails to create the object.
See Implementation
Creates a new [class@TileDownloader] that fetches tiles from an API and caches them on disk.
See [property@TileDownloader:url-template] for the format of the URL template.