Set min-max scale

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Sample viewer app

Restrict zooming between specific scale ranges.

Image of min max scale

Use case

Data may only appear at a certain scale on a map, and may be visually lost if zooming too far in or out. Setting the minimum and maximum scales ensures the zoom extents are appropriately limited for the purposes of the map.

How to use the sample

Zoom in and out of the map. The zoom extents of the map are limited between the given minimum and maximum scales.

How it works

  1. Instantiate an AGSMap object.
  2. Set the minimum and maximum scale using the minScale and maxScale properties of AGSMap.
  3. Set the map to an AGSMapView object.

Relevant API

  • AGSMap
  • AGSMapView
  • AGSViewpoint

Tags

area of interest, level of detail, maximum, minimum, scale, viewpoint

Sample Code

SetMinMaxScaleViewController.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

/// A view controller that manages the interface of the Set Min/Max Scale
/// sample.
class SetMinMaxScaleViewController: UIViewController {
    /// The map view managed by the view controller.
    @IBOutlet weak var mapView: AGSMapView! {
        didSet {
            mapView.map = makeMap()
            mapView.setViewpoint(AGSViewpoint(center: AGSPoint(x: -355_453, y: 7_548_720, spatialReference: .webMercator()), scale: 3_000))
        }
    }

    /// Creates a map with the min and max scale set.
    ///
    /// - Returns: A new `AGSMap` object.
    func makeMap() -> AGSMap {
        let map = AGSMap(basemapStyle: .arcGISStreets)
        map.minScale = 8_000
        map.maxScale = 2_000
        return map
    }

    // MARK: UIViewController

    override func viewDidLoad() {
        super.viewDidLoad()

        // add the source code button item to the right of navigation bar
        (self.navigationItem.rightBarButtonItem as? SourceCodeBarButtonItem)?.filenames = ["SetMinMaxScaleViewController"]
    }
}

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