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Showing content from https://developers.arcgis.com/ios/swift/sample-code/open-a-scene-portal-item/ below:

Open a scene (portal item) | ArcGIS Runtime API for iOS

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Open a web scene from a portal item.

A scene is symbolized geospatial content that allows you to visualize and analyze geographic information in an intuitive and interactive 3D environment. Web scenes are an ArcGIS format for storing scenes in ArcGIS Online or portal. Scenes can be used to visualize a complex 3D environment like a city.

When the sample is opened, it will automatically display the scene from ArcGIS Online. Pan and zoom to explore the scene.

To open a web scene from a portal item:

1. Create an AGSPortalItem with an item ID pointing to a web scene.
2. Create an AGSScene passing in the portal item.
3. Set the scene to an AGSSceneView to display it.

• AGSPortalItem
• AGSScene
• AGSSceneView

This sample uses a Berlin, Germany scene hosted on ArcGIS Online.

portal, scene, web scene

OpenSceneViewController.swift

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// Copyright 2018 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
//
//   http://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 UIKit
import ArcGIS

class OpenSceneViewController: UIViewController {
    @IBOutlet weak var sceneView: AGSSceneView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Add the source code button item to the right of navigation bar.
        (navigationItem.rightBarButtonItem as? SourceCodeBarButtonItem)?.filenames = ["OpenSceneViewController"]

        // Initialize portal with AGOL.
        let portal = AGSPortal.arcGISOnline(withLoginRequired: false)

        // Get the portal item, a scene featuring Berlin, Germany.
        let portalItem = AGSPortalItem(portal: portal, itemID: "31874da8a16d45bfbc1273422f772270")

        // Create a scene from the portal item.
        let scene = AGSScene(item: portalItem)

        // Set the scene to the scene view.
        sceneView.scene = scene
    }
}

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