1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
// Copyright 2017 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 ChangeSublayerRendererViewController: UIViewController {
@IBOutlet private var mapView: AGSMapView!
@IBOutlet private var resetBarButtonItem: UIBarButtonItem!
@IBOutlet private var applyRendererBarButtonItem: UIBarButtonItem!
/// Map image layer.
private let mapImageLayer = AGSArcGISMapImageLayer(url: URL(string: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer")!)
/// The counties sublayer of the map image layer.
private var countiesSublayer: AGSArcGISMapImageSublayer?
private var originalRenderer: AGSRenderer?
override func viewDidLoad() {
super.viewDidLoad()
// Add the source code button item to the right of navigation bar.
(self.navigationItem.rightBarButtonItem as! SourceCodeBarButtonItem).filenames = ["ChangeSublayerRendererViewController"]
// Initialize map with basemap.
let map = AGSMap(basemapStyle: .arcGISStreets)
// Add map image layer to the map.
map.operationalLayers.add(mapImageLayer)
// Set map on the map view.
mapView.map = map
// Set viewpoint.
let envelope = AGSEnvelope(xMin: -13834661.666904, yMin: 331181.323482, xMax: -8255704.998713, yMax: 9118038.075882, spatialReference: .webMercator())
mapView.setViewpoint(AGSViewpoint(targetExtent: envelope))
// Load map image layer to access sublayers.
self.mapImageLayer.load { [weak self] (error: Error?) in
guard let self = self else { return }
if let error = error {
print("Error loading map image layer: \(error)")
} else {
self.mapImageLayerDidLoad()
}
}
}
/// Called in response to the map image layer loading successfully.
func mapImageLayerDidLoad() {
// Get the counties sublayer.
let mapImageSublayers = mapImageLayer.mapImageSublayers
guard mapImageSublayers.count >= 3,
let sublayer = mapImageSublayers[2] as? AGSArcGISMapImageSublayer else {
return
}
countiesSublayer = sublayer
// Load the sublayer to get the original renderer.
sublayer.load { [weak self] (error) in
guard let self = self else { return }
if let error = error {
print("Error loading map image sublayer: \(error)")
} else {
self.countiesSublayerDidLoad()
}
}
}
/// Called in response to the counties sublayer loading successfully.
func countiesSublayerDidLoad() {
originalRenderer = countiesSublayer?.renderer
// Enable bar button items.
applyRendererBarButtonItem.isEnabled = true
resetBarButtonItem.isEnabled = true
}
/// Creates a class breaks renderer for counties in the US based on their
/// population in 2007.
///
/// - Returns: An `AGSClassBreaksRenderer` object.
private func makeClassBreakRenderer() -> AGSClassBreaksRenderer {
// Outline symbol.
let lineSymbol = AGSSimpleLineSymbol(style: .solid, color: UIColor(white: 0.6, alpha: 1), width: 0.5)
// Symbols for each class break.
let symbol1 = AGSSimpleFillSymbol(style: .solid, color: UIColor(red: 0.89, green: 0.92, blue: 0.81, alpha: 1), outline: lineSymbol)
let symbol2 = AGSSimpleFillSymbol(style: .solid, color: UIColor(red: 0.59, green: 0.76, blue: 0.75, alpha: 1), outline: lineSymbol)
let symbol3 = AGSSimpleFillSymbol(style: .solid, color: UIColor(red: 0.38, green: 0.65, blue: 0.71, alpha: 1), outline: lineSymbol)
let symbol4 = AGSSimpleFillSymbol(style: .solid, color: UIColor(red: 0.27, green: 0.49, blue: 0.59, alpha: 1), outline: lineSymbol)
let symbol5 = AGSSimpleFillSymbol(style: .solid, color: UIColor(red: 0.16, green: 0.33, blue: 0.47, alpha: 1), outline: lineSymbol)
// Class breaks.
let classBreak1 = AGSClassBreak(description: "-99 to 8560", label: "-99 to 8560", minValue: -99, maxValue: 8560, symbol: symbol1)
let classBreak2 = AGSClassBreak(description: "> 8,560 to 18,109", label: "> 8,560 to 18,109", minValue: 8561, maxValue: 18109, symbol: symbol2)
let classBreak3 = AGSClassBreak(description: "> 18,109 to 35,501", label: "> 18,109 to 35,501", minValue: 18110, maxValue: 35501, symbol: symbol3)
let classBreak4 = AGSClassBreak(description: "> 35,501 to 86,100", label: "> 35,501 to 86,100", minValue: 35502, maxValue: 86100, symbol: symbol4)
let classBreak5 = AGSClassBreak(description: "> 86,100 to 10,110,975", label: "> 86,100 to 10,110,975", minValue: 86101, maxValue: 10110975, symbol: symbol5)
// Create a class break renderer using the class breaks above.
let classBreakRenderer = AGSClassBreaksRenderer(fieldName: "POP2007", classBreaks: [ classBreak1, classBreak2, classBreak3, classBreak4, classBreak5])
return classBreakRenderer
}
// MARK: - Actions
@IBAction private func applyRenderer() {
countiesSublayer?.renderer = makeClassBreakRenderer()
}
@IBAction private func reset() {
countiesSublayer?.renderer = originalRenderer
}
}
