Offline Map for Mobile

This repo describes how to build an Offline Map for mobile on iOS. Local assets such as vector data, styles, glyphs and sprites are built into a sample iOS app.

Features

• 100% local data (notice in the animation that WiFi is turned off at the beginning of the demo)
• Vector data built using https://openmaptiles.org
• Styling of the countries is from https://github.com/klokantech/mapbox-gl-js-offline-example
• Built upon https://github.com/klokantech/osm2vectortiles-ios, now an iOS app can be built to have local vector data, styles, glyphs and sprites.

Build

The MapLibre Mobile SDK is installed via the Swift Package Manager.

GitHub Actions

• https://docs.github.com/actions/quickstart
• 

---

Command Line Building

# Build
xcodebuild -scheme GeographyClass build

# Test
xcodebuild -scheme GeographyClass test \
  -destination 'platform=iOS Simulator,name=iPhone 8'

# Test without building
xcodebuild -scheme GeographyClass test-without-building   \
  -destination 'platform=iOS Simulator,name=iPhone 11 Pro' \
  -destination 'platform=iOS,name=iPhone 8' \

Mapbox token

• Since the Map vector data is local, its technically not needed to have an access token
  • But to be safe, here are notes on how to
• Following notes from https://docs.mapbox.com/help/troubleshooting/private-access-token-android-and-ios/

Create a new plain text file containing your access token, named either .mapbox or mapbox. To avoid accidentally committing this file to an open-source project, either you can save it to a location outside your project's version-controlled directory, or you can add this file to your project’s .gitignore file.

• Then open the Project file

open openmaptiles-ios-demo.xcodeproj

Architecture

• All assets are local and are accessed by Mapbox GL by the asset:// URI.

"sources": {
    "countries": {
        "type": "vector",
        "tiles": [
            "asset://geography-class.osm2vectortiles/{z}/{x}/{y}.pbf"
        ]
    }
},
"sprite": "asset://sprites/bright-v8",
"glyphs": "asset://glyphs/{fontstack}/{range}.pbf",

---

Soft Proofing Tiles

You can Soft Proof your tiles before they are installed into mobile by using Tileserver GL.

• Discussion on whether .pbf can be compressed when using tippecanoe: mapbox / tippecanoe #582
  • tippecanoe -pC --maximum-zoom=7 -o poly.pC.mbtiles poly.geojson

Sample Tile JSON & Styles

Tile JSON with GitHub served .pbf. Choose either the Tile JSON or Mapbox Style

• tileJSON/geography-class.GitHub.json
• styles/geography-class.GitHub.json

Locally served .pbf

• See the sample Tile JSON tileJSON/geography-class.localhost.json
  • useful for use with Maputnik or Fresco
  • also an example to test your web server is serving up proper uncompressed .pbf
    • wget --spider http://localhost:5000/geography-class.osm2vectortiles/0/0/0.pbf

# Install `serve` from https://www.npmjs.com/package/serve
#  yarn global add serve   # do this once

cd OSM2VectorTiles

# Serve raw `.pbf` files using [serve](https://www.npmjs.com/package/serve)
# serve -v # version

# Be sure to open `http://localhost:5000` to confirm what is being served
serve --cors --listen 5000 # serve current directory; CORS; listen on port 5000

# Using a different server to hook into those raw tiles
alias tsgl='docker run --rm -it -v "$(pwd)":/data -p 8081:80 maptiler/tileserver-gl --verbose'

tsgl  # starts Tileserver GL using the file config.json

Zurich Sample

Using the Zurich Sample from Maptiler.

See the metadata for details on

• how to run Tileserver-GL using docker or npm.
• How to fetch the Zurich MBTiles

Available Endpoints

• Useful for inspecting OpenMapTiles schema v3 with a Basic style
  • Health — http://localhost:8081/health
  • TileJSON — http://localhost:8081/index.json
  • Styles — http://localhost:8081/styles.json
  • Fonts or Glyphs used in the style (not the fonts used by Mapbox) — http://localhost:8081/fonts.json

tsgl --config OSM2VectorTiles/tileserver-gl/config.zurich.json

Geography Class

Geography Class does not conform the OpenMapTiles schema v3. You can inspect

Available Endpoints

• Health — http://localhost:8081/health
• TileJSON — http://localhost:8081/index.json
• Styles — http://localhost:8081/styles.json
• Fonts or Glyphs used in the style (not the fonts used by Mapbox) — http://localhost:8081/fonts.json
• Sprites for this particular style — http://localhost:5000/sprites/bright-v8@2x.png

tsgl --config tileserver-gl/config.geography-class.json

---

• (QuickTime has a bug when screen recording; as it still shows WiFi service is on, when it indeed is off)

---

Building

You can build the Mapbox Maps v10 version by checking out the tag v10-geography-class

export REPO=roblabs/openmaptiles-ios-demo

git clone --recursive \
  https://github.com/$REPO.git \
  tmp/$REPO

cd tmp/$REPO

TAG=v10-geography-class
git checkout tags/$TAG -b $TAG

xed .

Change Log

• Jun 17, 2021
  • Add MapView OSLog Extensions from https://github.com/roblabs/mapview-log-extensions
• May 06, 2021
  • Upgrade MapLibre for iOS to 5.12.0-pre.1. MetalANGLE build.
• Mar 12, 2021
  • Upgrade MapLibre for iOS from 5.10.0 to 5.11.0
• Jan 30, 2021
  • Convert to Offline Maps with SwiftUI. Local style with local tiles using the protocol asset://
  • branch: mapbox-maps-ios-v10 updated with MapboxMaps Library from https://github.com/mapbox/mapbox-maps-ios
  • Rename project to Geography Class
  • Minimum iOS is 13.0
  • Tested with Xcode 12.4 & 12.5
• Jan 26, 2021
  • Update to MapLibre. maplibre/maplibre-gl-native-distribution#2
  • Remove references to Carthage. See the branch carthage, if needed.
• Jun 24, 2020
  • Updated notes on how to use Tileserver GL
• Jun 17, 2020
  • Add config.json for use by Tileserver GL
• Jun 2, 2020
  • Update to use Carthage only; removed dependency on Cocoapods
  • Upgrade to Xcode 11.5
  • Upgrade to Mapbox 5.9 & mapbox-events-ios 0.10
  • Add Xcode Bots & Continuous Integration scripts
• Dec 13, 2019
  • Move from Cocoapods to Carthage
  • Upgrade to Xcode 11.3
  • Uprade to Mapbox 5.5
  • Add local, private Mapbox Token
• Nov 19, 2019
  • Upgrade to Xcode 10.1
• Jan 30, 2017
  • upgrade to Mapbox 3.4.1 & Podfile
• 2016 — Initial Version