Display map from mobile map package

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Display a map from a mobile map package.

Screenshot of display map from mobile map package sample

Use case

An .mmpk file is an archive containing the data (specifically, basemaps and features) used to display an offline map.

How to use the sample

The sample displays the map in the mobile map package. Pan and zoom to observe the data from the mobile map package.

How it works

  1. Create a MobileMapPackage instance, specifying the path to the .mmpk file.
  2. Asynchronously load the mobile map package.
  3. After it successfully loads, get the map from the mobile map package and update the map view's map with it.

Relevant API

  • MapView
  • MobileMapPackage

About the data

This sample shows points of interest within a Yellowstone Mobile Map Package hosted on ArcGIS Online.

Tags

mmpk, mobile map package, offline

Sample Code

DisplayMapFromMobileMapPackageView.swift
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// Copyright 2022 Esri
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import ArcGIS
import SwiftUI

struct DisplayMapFromMobileMapPackageView: View {
    /// A map with no specified style.
    @State private var map = Map()

    /// The mobile map package.
    @State private var mobileMapPackage: MobileMapPackage!

    /// The error shown in the error alert.
    @State private var error: Error?

    /// Loads a local mobile map package.
    private func loadMobileMapPackage() async throws {
        // Loads the local mobile map package.
        let yellowstoneURL = Bundle.main.url(forResource: "Yellowstone", withExtension: "mmpk")!
        mobileMapPackage = MobileMapPackage(fileURL: yellowstoneURL)
        try await mobileMapPackage.load()
        // Gets the first map in the mobile map package.
        guard let map = mobileMapPackage.maps.first else { return }
        self.map = map
    }

    var body: some View {
        // Creates a map view to display the map.
        MapView(map: map)
            .task {
                do {
                    try await loadMobileMapPackage()
                } catch {
                    // Presents an error message if the map fails to load.
                    self.error = error
                }
            }
            .errorAlert(presentingError: $error)
    }
}

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