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define protocol MapScaleCalculator for integration with different MapView
1 parent 89f3926 commit 944d41f

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8 files changed

+65
-23
lines changed

8 files changed

+65
-23
lines changed

‎MapScaleView_iOS_API.xcodeproj/project.pbxproj‎

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Original file line numberDiff line numberDiff line change
@@ -379,7 +379,7 @@
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"@executable_path/Frameworks",
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);
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MARKETING_VERSION = 1.1.0;
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PRODUCT_BUNDLE_IDENTIFIER = "xattacker.MapScaleView-iOS-API";
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PRODUCT_BUNDLE_IDENTIFIER = com.xattacker.MapScaleSample;
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PRODUCT_NAME = "$(TARGET_NAME)";
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PROVISIONING_PROFILE_SPECIFIER = "";
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SWIFT_VERSION = 5.0;
@@ -401,7 +401,7 @@
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"@executable_path/Frameworks",
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);
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MARKETING_VERSION = 1.1.0;
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PRODUCT_BUNDLE_IDENTIFIER = "xattacker.MapScaleView-iOS-API";
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PRODUCT_BUNDLE_IDENTIFIER = com.xattacker.MapScaleSample;
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PRODUCT_NAME = "$(TARGET_NAME)";
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PROVISIONING_PROFILE_SPECIFIER = "";
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SWIFT_VERSION = 5.0;

‎MapScaleView_iOS_API.xcodeproj/xcuserdata/xattacker.xcuserdatad/xcschemes/xcschememanagement.plist‎

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@@ -7,7 +7,7 @@
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<key>MapScaleView_iOS_API.xcscheme_^#shared#^_</key>
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<dict>
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<key>orderHint</key>
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<integer>0</integer>
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<integer>1</integer>
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</dict>
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</dict>
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</dict>

‎MapScaleView_iOS_API/AppDelegate.swift‎

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Original file line numberDiff line numberDiff line change
@@ -10,11 +10,10 @@ import UIKit
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import GoogleMaps
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@UIApplicationMain
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class AppDelegate: UIResponder, UIApplicationDelegate {
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class AppDelegate: UIResponder, UIApplicationDelegate
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{
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var window: UIWindow?
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17-
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func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
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// Override point for customization after application launch.
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‎MapScaleView_iOS_API/Base.lproj/Main.storyboard‎

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Original file line numberDiff line numberDiff line change
@@ -81,6 +81,14 @@
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<constraints>
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<constraint firstAttribute="height" constant="30" id="dpQ-Uc-KpQ"/>
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</constraints>
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<userDefinedRuntimeAttributes>
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<userDefinedRuntimeAttribute type="color" keyPath="outlineColor">
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<color key="value" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
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</userDefinedRuntimeAttribute>
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<userDefinedRuntimeAttribute type="color" keyPath="bodyColor">
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<color key="value" systemColor="systemIndigoColor"/>
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</userDefinedRuntimeAttribute>
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</userDefinedRuntimeAttributes>
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</view>
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</subviews>
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<viewLayoutGuide key="safeArea" id="PlR-dh-pct"/>
@@ -128,5 +136,8 @@
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<systemColor name="systemBackgroundColor">
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<color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
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</systemColor>
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<systemColor name="systemIndigoColor">
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<color red="0.34509803921568627" green="0.33725490196078434" blue="0.83921568627450982" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
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</systemColor>
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</resources>
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</document>

‎MapScaleView_iOS_API/GoogleMapViewController.swift‎

Lines changed: 23 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -10,17 +10,23 @@ import UIKit
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import GoogleMaps
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13-
// ScaleView setup with
13+
// ScaleView setup with GMSMapView
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class GoogleMapViewController: UIViewController, GMSMapViewDelegate
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{
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@IBOutlet weak var mapView: GMSMapView!
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@IBOutlet weak var scaleView: UIMapScaleView!
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@IBOutlet private weak var mapView: GMSMapView!
17+
@IBOutlet private weak var scaleView: UIMapScaleView!
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override func viewDidLoad()
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{
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super.viewDidLoad()
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2323
// Do any additional setup after loading the view.
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// set positon to the center of Taiwan
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let position = GMSCameraPosition(latitude: 23.80030512974474, longitude: 120.96817418343652, zoom: 8)
26+
self.mapView.camera = position
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28+
self.mapView.delegate = self
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self.scaleView.mapScaleCalculator = self.mapView
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}
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// MARK: implement from GMSMapViewDelegate
@@ -29,3 +35,17 @@ class GoogleMapViewController: UIViewController, GMSMapViewDelegate
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self.scaleView.setNeedsLayout()
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}
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}
38+
39+
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// make GMSMapView could support ScaleView
41+
extension GMSMapView: MapScaleCalculator
42+
{
43+
public var metersPerPixel: CGFloat
44+
{
45+
let topLeft = self.projection.visibleRegion().farLeft
46+
let bottomLeft = self.projection.visibleRegion().nearLeft
47+
let lat = CGFloat(abs(Float(topLeft.latitude - bottomLeft.latitude)))
48+
let metersPerPixel = CGFloat((cos(lat * .pi / 180) * 2 * .pi) * 6378137 / CGFloat((256 * pow(2, self.camera.zoom))))
49+
return metersPerPixel
50+
}
51+
}

‎MapScaleView_iOS_API/Info.plist‎

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@@ -31,8 +31,7 @@
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<key>UISupportedInterfaceOrientations</key>
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<array>
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<string>UIInterfaceOrientationPortrait</string>
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<string>UIInterfaceOrientationLandscapeLeft</string>
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<string>UIInterfaceOrientationLandscapeRight</string>
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<string>UIInterfaceOrientationPortraitUpsideDown</string>
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</array>
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<key>UISupportedInterfaceOrientations~ipad</key>
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<array>

‎MapScaleView_iOS_API/Sources/UIMapScaleView.swift‎

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Original file line numberDiff line numberDiff line change
@@ -23,6 +23,22 @@ public enum MapScaleDistanceUnit
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case imperial // UK
2424
}
2525

26+
public protocol MapScaleCalculator: class
27+
{
28+
var metersPerPixel: CGFloat { get }
29+
}
30+
31+
32+
extension MKMapView: MapScaleCalculator
33+
{
34+
public var metersPerPixel: CGFloat
35+
{
36+
let horizontalDistance = MKMetersPerMapPointAtLatitude(self.centerCoordinate.latitude)
37+
let metersPerPixel = CGFloat(self.visibleMapRect.size.width * horizontalDistance) / self.bounds.size.width
38+
return metersPerPixel
39+
}
40+
}
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2743
@IBDesignable
2844
public final class UIMapScaleView: UIView
@@ -71,7 +87,8 @@ public final class UIMapScaleView: UIView
7187
}
7288
}
7389

74-
private weak var mapView: MKMapView?
90+
public weak var mapScaleCalculator: MapScaleCalculator?
91+
7592
private weak var distanceLabel: UILabel?
7693
private var scaledWidth = CGFloat(0)
7794

@@ -93,16 +110,13 @@ public final class UIMapScaleView: UIView
93110
{
94111
super.layoutSubviews()
95112

96-
guard let mapView = self.mapView else
113+
guard let calculator = self.mapScaleCalculator else
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{
98115
return
99116
}
100117

101118

102-
let horizontalDistance = MKMetersPerMapPointAtLatitude(mapView.centerCoordinate.latitude)
103-
let metersPerPixel = CGFloat(mapView.visibleMapRect.size.width * horizontalDistance) / mapView.bounds.size.width
104-
let distance = self.calculateDistance(metersPerPixel)
105-
119+
let distance = self.calculateDistance(calculator.metersPerPixel)
106120
self.scaledWidth = distance.width
107121
self.setNeedsDisplay()
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@@ -203,9 +217,9 @@ public final class UIMapScaleView: UIView
203217
}
204218
}
205219

206-
public func setupMap(_ mapView: MKMapView)
220+
deinit
207221
{
208-
self.mapView = mapView
222+
self.mapScaleCalculator = nil
209223
}
210224
}
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‎MapScaleView_iOS_API/ViewController.swift‎

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Original file line numberDiff line numberDiff line change
@@ -13,16 +13,16 @@ import MapKit
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// ScaleView setup with MKMapView
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class ViewController: UIViewController, MKMapViewDelegate
1515
{
16-
@IBOutlet weak var mapView: MKMapView!
17-
@IBOutlet weak var scaleView: UIMapScaleView!
16+
@IBOutlet private weak var mapView: MKMapView!
17+
@IBOutlet private weak var scaleView: UIMapScaleView!
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1919
override func viewDidLoad()
2020
{
2121
super.viewDidLoad()
2222
// Do any additional setup after loading the view, typically from a nib.
2323

2424
self.mapView.delegate = self
25-
self.scaleView.setupMap(self.mapView)
25+
self.scaleView.mapScaleCalculator = self.mapView
2626
//self.scaleView.unit = .imperial
2727
}
2828

@@ -32,4 +32,3 @@ class ViewController: UIViewController, MKMapViewDelegate
3232
self.scaleView.setNeedsLayout()
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}
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}
35-

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