Get started
Before you can try the sample code, you must configure your development environment. For more information, see Maps SDK for iOS code samples.
View the code
Swift
import GoogleMaps import UIKit final class PolylinesViewController: UIViewController { private lazy var styles: [GMSStrokeStyle] = { let greenStyle = GMSStrokeStyle.gradient(from: .green, to: UIColor.green.withAlphaComponent(0)) let redStyle = GMSStrokeStyle.gradient(from: UIColor.red.withAlphaComponent(0), to: .red) return [greenStyle, redStyle, GMSStrokeStyle.solidColor(UIColor(white: 0, alpha: 0))] }() private var pathLength: Double = 0 private var pos: Double = 0 private var polylines: [GMSPolyline] = [] private lazy var mapView: GMSMapView = { let camera = GMSCameraPosition(latitude: -30, longitude: -175, zoom: 3) return GMSMapView(frame: .zero, camera: camera) }() override func loadView() { view = mapView mapView.accessibilityElementsHidden = true } override func viewDidLoad() { super.viewDidLoad() var path = GMSMutablePath() path.addLatitude(-33.866901, longitude: 151.195988) path.addLatitude(-18, longitude: 179) path.addLatitude(21.291982, longitude: -157.821856) path.addLatitude(37.423802, longitude: -122.091859) path.addLatitude(-12, longitude: -77) path.addLatitude(-33.866901, longitude: 151.195988) path = path.pathOffset(byLatitude: -30, longitude: 0) pathLength = path.length(of: .geodesic) / 21 for i in 0..<30 { let polyline = GMSPolyline(path: path.pathOffset(byLatitude: Double(i) * 1.5, longitude: 0)) polyline.strokeWidth = 8 polyline.geodesic = true polyline.map = mapView polylines.append(polyline) } animatePath() } // Updates the path style every 0.1 seconds. private func animatePath() { polylines.forEach { if let path = $0.path { $0.spans = GMSStyleSpansOffset(path, styles, [NSNumber(value: pathLength)], .geodesic, pos) } } pos -= 50000 DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 0.1) { self.animatePath() } } }
Objective-C
#import "GoogleMapsDemos/Samples/PolylinesViewController.h" #import <GoogleMaps/GoogleMaps.h> static CLLocationCoordinate2D kSydneyAustralia = {-33.866901, 151.195988}; static CLLocationCoordinate2D kHawaiiUSA = {21.291982, -157.821856}; static CLLocationCoordinate2D kFiji = {-18, 179}; static CLLocationCoordinate2D kMountainViewUSA = {37.423802, -122.091859}; static CLLocationCoordinate2D kLimaPeru = {-12, -77}; static bool kAnimate = true; @implementation PolylinesViewController { NSArray *_styles; NSArray *_lengths; NSArray *_polys; double _pos, _step; GMSMapView *_mapView; } - (void)tick { for (GMSPolyline *poly in _polys) { poly.spans = GMSStyleSpansOffset(poly.path, _styles, _lengths, kGMSLengthGeodesic, _pos); } _pos -= _step; if (kAnimate) { __weak id weakSelf = self; dispatch_after(dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC / 10), dispatch_get_main_queue(), ^{ [weakSelf tick]; }); } } - (void)initLines { if (!_polys) { NSMutableArray *polys = [NSMutableArray array]; GMSMutablePath *path = [GMSMutablePath path]; [path addCoordinate:kSydneyAustralia]; [path addCoordinate:kFiji]; [path addCoordinate:kHawaiiUSA]; [path addCoordinate:kMountainViewUSA]; [path addCoordinate:kLimaPeru]; [path addCoordinate:kSydneyAustralia]; path = [path pathOffsetByLatitude:-30 longitude:0]; _lengths = @[ @([path lengthOfKind:kGMSLengthGeodesic] / 21) ]; for (int i = 0; i < 30; ++i) { GMSPolyline *poly = [[GMSPolyline alloc] init]; poly.path = [path pathOffsetByLatitude:(i * 1.5) longitude:0]; poly.strokeWidth = 8; poly.geodesic = YES; poly.map = _mapView; [polys addObject:poly]; } _polys = polys; } } - (void)viewDidLoad { [super viewDidLoad]; GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:-30 longitude:-175 zoom:3]; GMSMapView *mapView = [GMSMapView mapWithFrame:CGRectZero camera:camera]; mapView.accessibilityElementsHidden = YES; self.view = mapView; _mapView = mapView; CGFloat alpha = 1; UIColor *green = [UIColor colorWithRed:0 green:1 blue:0 alpha:alpha]; UIColor *greenTransp = [UIColor colorWithRed:0 green:1 blue:0 alpha:0]; UIColor *red = [UIColor colorWithRed:1 green:0 blue:0 alpha:alpha]; UIColor *redTransp = [UIColor colorWithRed:1 green:0 blue:0 alpha:0]; GMSStrokeStyle *grad1 = [GMSStrokeStyle gradientFromColor:green toColor:greenTransp]; GMSStrokeStyle *grad2 = [GMSStrokeStyle gradientFromColor:redTransp toColor:red]; _styles = @[ grad1, grad2, [GMSStrokeStyle solidColor:[UIColor colorWithWhite:0 alpha:0]], ]; _step = 50000; [self initLines]; [self tick]; } @end
Run the full sample app locally
The Maps SDK for iOS sample app is available as a download archive from GitHub. Follow these steps to install and try the Maps SDK for iOS sample app.
- Run
git clone https://github.com/googlemaps-samples/maps-sdk-for-ios-samples.git
to clone the samples repository into a local directory. Open a terminal window, navigate to the directory where you cloned the sample files, and drill down into the GoogleMaps directory:
Swift
cd maps-sdk-for-ios-samples-main/GoogleMaps-Swift
pod install
open GoogleMapsSwiftDemos.xcworkspace
Objective-C
cd maps-sdk-for-ios-samples-main/GoogleMaps
pod install
open GoogleMapsDemos.xcworkspace
- In Xcode, press the compile button to
build the app
with the current scheme. The build produces an error, prompting you to enter your API key
in the
SDKConstants.swift
file for Swift orSDKDemoAPIKey.h
file for Objective-C. - If you don't yet have an API key, follow the
instructions to set up
a project on the Google Cloud Console and get an API key. When configuring the
key on the Cloud Console, you can
restrict the key to the
sample app's bundle identifier to
ensure that only your app can use the key. The default bundle identifier of
the SDK samples app is
com.example.GoogleMapsDemos
. - Edit the
SDKConstants.swift
file for Swift orSDKDemoAPIKey.h
file for Objective-C and paste your API key into the definition of either theapiKey
orkAPIKey
constant. For example:Swift
static let apiKey = "YOUR_API_KEY"
Objective-C
static NSString *const kAPIKey = @"YOUR_API_KEY";
- In the
SDKConstants.swift
file (Swift) orSDKDemoAPIKey.h
file (Objective-C), remove the following line, because it's used to register the user-defined issue:Swift
#error (Register for API Key and insert here. Then delete this line.)
Objective-C
#error Register for API Key and insert here.
- Build and run the project. The iOS simulator window appears, showing a list of Maps SDK Demos.
- Choose one of the options displayed, to experiment with a feature of the Maps SDK for iOS.
- If prompted to allow GoogleMapsDemos to access your location, choose Allow.