Query Installed Regions

This section deals with reading locally installed regions, checking whether offline map data is available, and inspecting coverage bounds and cached region details.

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let installedRegions = NGLRegionalOffline.listInstalledRegions()
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for region in installedRegions {
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    print(
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        "region=\(region.regionId) " +
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        "version=\(region.regionVersion ?? "-") " +
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        "packages=\(region.packageCount) " +
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        "complete=\(region.allTarsOk)"
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    )
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}

To check whether any region is available:

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let hasInstalledRegions = NGLRegionalOffline.hasInstalledOfflineRegions()

To read the downloaded tile coverage bounds for installed regions:

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let boundaries = NGLRegionalOffline.installedRegionBoundaries()

These values come from regions.definition.bounds in the installed Tile databases and describe coverage rectangles, not exact administrative polygons.

To load locally cached details for an installed region:

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let result = NGLRegionalOffline.loadDetail(forRegionId: regionId)
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let localDetail = result.detail