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The map responds to zoom gestures only when the switch is toggled on.
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Before you can try the sample code, you must configure your development environment.
For more information, seeMaps SDK for iOS code samples.
View the code
Swift
importGoogleMapsimportUIKitclassGestureControlViewController:UIViewController{privateletholderHeight:CGFloat=60privateletzoomLabelInset:CGFloat=16privatelazyvarmapView:GMSMapView={letcamera=GMSCameraPosition(latitude:-25.5605,longitude:133.605097,zoom:3)returnGMSMapView(frame:.zero,camera:camera)}()privatelazyvarzoomSwitch:UISwitch=UISwitch(frame:.zero)overridefuncviewDidLoad(){super.viewDidLoad()view.addSubview(mapView)letholder=UIView(frame:.zero)holder.backgroundColor=UIColor(white:1,alpha:0.8)view.addSubview(holder)letzoomLabel=UILabel(frame:.zero)zoomLabel.text="Zoom gestures"zoomLabel.font=.boldSystemFont(ofSize:18)holder.addSubview(zoomLabel)// Control zooming.holder.addSubview(zoomSwitch)zoomSwitch.addTarget(self,action:#selector(toggleZoom),for:.valueChanged)zoomSwitch.isOn=true[mapView,holder,zoomLabel,zoomSwitch].forEach({$0.translatesAutoresizingMaskIntoConstraints=false})NSLayoutConstraint.activate([mapView.leftAnchor.constraint(equalTo:view.leftAnchor),mapView.rightAnchor.constraint(equalTo:view.rightAnchor),mapView.topAnchor.constraint(equalTo:view.topAnchor),mapView.bottomAnchor.constraint(equalTo:view.bottomAnchor),holder.heightAnchor.constraint(equalToConstant:holderHeight),holder.centerXAnchor.constraint(equalTo:view.centerXAnchor),holder.widthAnchor.constraint(equalTo:view.widthAnchor),zoomLabel.leftAnchor.constraint(equalTo:holder.leftAnchor,constant:zoomLabelInset),zoomLabel.centerYAnchor.constraint(equalTo:holder.centerYAnchor),zoomSwitch.rightAnchor.constraint(equalTo:holder.rightAnchor,constant:-zoomLabelInset),zoomSwitch.centerYAnchor.constraint(equalTo:holder.centerYAnchor),])NSLayoutConstraint.activate([holder.topAnchor.constraint(equalTo:self.view.safeAreaLayoutGuide.topAnchor)])}@objcfunctoggleZoom(){mapView.settings.zoomGestures=zoomSwitch.isOn}}
The Maps SDK for iOS sample app is available as adownload archivefromGitHub.
Follow these steps to install and try the Maps SDK for iOS sample app.
Rungit clone https://github.com/googlemaps-samples/maps-sdk-for-ios-samples.gitto 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-Swiftpod installopen GoogleMapsSwiftDemos.xcworkspace
Objective-C
cd maps-sdk-for-ios-samples-main/GoogleMapspod installopen GoogleMapsDemos.xcworkspace
In Xcode, press the compile button tobuild the appwith the current scheme. The build produces an error, prompting you to enter your API key
in theSDKConstants.swiftfile for Swift orSDKDemoAPIKey.hfile for Objective-C.
Edit theSDKConstants.swiftfile for Swift orSDKDemoAPIKey.hfile for Objective-C and paste your API key into the definition of either theapiKeyorkAPIKeyconstant. For example:
Swift
static let apiKey = "YOUR_API_KEY"
Objective-C
staticNSString*constkAPIKey=@"YOUR_API_KEY";
In theSDKConstants.swiftfile (Swift) orSDKDemoAPIKey.hfile (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 ofMaps 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, chooseAllow.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-09-04 UTC."],[[["\u003cp\u003eThis webpage provides code samples demonstrating how to control zoom gestures on a Google Map using a switch.\u003c/p\u003e\n"],["\u003cp\u003eWhen the switch is toggled on, users can zoom in and out of the map using gestures.\u003c/p\u003e\n"],["\u003cp\u003eTo run the sample code, you need to configure your development environment and obtain a Google Maps API key.\u003c/p\u003e\n"],["\u003cp\u003eThe webpage provides step-by-step instructions on how to set up and run the sample app locally.\u003c/p\u003e\n"]]],["The provided code demonstrates how to control zoom gestures on a Google Map in iOS using a switch. A `GMSMapView` is created, and a `UISwitch` toggles zoom gesture functionality on or off. When the switch is on, zoom gestures are enabled; when off, they are disabled. The code examples are provided in both Swift and Objective-C and include instructions on how to install the Maps SDK for iOS sample app.\n"],null,["The map responds to zoom gestures only when the switch is toggled on.\n\nGet started\n\nBefore you can try the sample code, you must configure your development environment.\nFor more information, see [Maps SDK for iOS code samples](/maps/documentation/ios-sdk/examples).\n\nView the code \n\nSwift \n\n```swift\nimport GoogleMaps\nimport UIKit\n\nclass GestureControlViewController: UIViewController {\n private let holderHeight: CGFloat = 60\n private let zoomLabelInset: CGFloat = 16\n\n private lazy var mapView: GMSMapView = {\n let camera = GMSCameraPosition(latitude: -25.5605, longitude: 133.605097, zoom: 3)\n return GMSMapView(frame: .zero, camera: camera)\n }()\n private lazy var zoomSwitch: UISwitch = UISwitch(frame: .zero)\n\n override func viewDidLoad() {\n super.viewDidLoad()\n\n view.addSubview(mapView)\n\n let holder = UIView(frame: .zero)\n holder.backgroundColor = UIColor(white: 1, alpha: 0.8)\n view.addSubview(holder)\n\n let zoomLabel = UILabel(frame: .zero)\n zoomLabel.text = \"Zoom gestures\"\n zoomLabel.font = .boldSystemFont(ofSize: 18)\n holder.addSubview(zoomLabel)\n\n // Control zooming.\n holder.addSubview(zoomSwitch)\n zoomSwitch.addTarget(self, action: #selector(toggleZoom), for: .valueChanged)\n zoomSwitch.isOn = true\n\n [mapView, holder, zoomLabel, zoomSwitch].forEach({\n $0.translatesAutoresizingMaskIntoConstraints = false\n })\n NSLayoutConstraint.activate([\n mapView.leftAnchor.constraint(equalTo: view.leftAnchor),\n mapView.rightAnchor.constraint(equalTo: view.rightAnchor),\n mapView.topAnchor.constraint(equalTo: view.topAnchor),\n mapView.bottomAnchor.constraint(equalTo: view.bottomAnchor),\n holder.heightAnchor.constraint(equalToConstant: holderHeight),\n holder.centerXAnchor.constraint(equalTo: view.centerXAnchor),\n holder.widthAnchor.constraint(equalTo: view.widthAnchor),\n zoomLabel.leftAnchor.constraint(equalTo: holder.leftAnchor, constant: zoomLabelInset),\n zoomLabel.centerYAnchor.constraint(equalTo: holder.centerYAnchor),\n zoomSwitch.rightAnchor.constraint(equalTo: holder.rightAnchor, constant: -zoomLabelInset),\n zoomSwitch.centerYAnchor.constraint(\n equalTo: holder.centerYAnchor),\n ])\n NSLayoutConstraint.activate([\n holder.topAnchor.constraint(equalTo: self.view.safeAreaLayoutGuide.topAnchor)\n ])\n }\n\n @objc func toggleZoom() {\n mapView.settings.zoomGestures = zoomSwitch.isOn\n }\n\n}https://github.com/googlemaps-samples/maps-sdk-for-ios-samples/blob/86408feffd008565cd2cafce8aff3dc27f1f41bb/GoogleMaps-Swift/GoogleMapsSwiftDemos/Swift/Samples/GestureControlViewController.swift#L14-L72\n \n```\n\nObjective-C \n\n```objective-c\n#import \"GoogleMapsDemos/Samples/GestureControlViewController.h\"\n\n#import \u003cGoogleMaps/GoogleMaps.h\u003e\n\n@implementation GestureControlViewController {\n GMSMapView *_mapView;\n UISwitch *_zoomSwitch;\n}\n\n- (void)viewDidLoad {\n [super viewDidLoad];\n GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:-25.5605\n longitude:133.605097\n zoom:3];\n\n _mapView = [GMSMapView mapWithFrame:CGRectZero camera:camera];\n _mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;\n _mapView.accessibilityIdentifier = @\"gestureControlDemoMapView\";\n\n self.view = [[UIView alloc] initWithFrame:CGRectZero];\n [self.view addSubview:_mapView];\n\n UIView *holder = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 0, 59)];\n holder.autoresizingMask =\n UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleBottomMargin;\n holder.backgroundColor = [UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:0.8f];\n [self.view addSubview:holder];\n\n // Zoom label.\n UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(16, 16, 200, 29)];\n label.text = @\"Zooming?\";\n label.font = [UIFont boldSystemFontOfSize:18.0f];\n label.textAlignment = NSTextAlignmentLeft;\n label.backgroundColor = [UIColor clearColor];\n label.layer.shadowColor = [[UIColor whiteColor] CGColor];\n label.layer.shadowOffset = CGSizeMake(0.0f, 1.0f);\n label.layer.shadowOpacity = 1.0f;\n label.layer.shadowRadius = 0.0f;\n [holder addSubview:label];\n\n // Control zooming.\n _zoomSwitch = [[UISwitch alloc] initWithFrame:CGRectMake(-90, 16, 0, 0)];\n _zoomSwitch.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin;\n [_zoomSwitch addTarget:self\n action:@selector(didChangeZoomSwitch)\n forControlEvents:UIControlEventValueChanged];\n _zoomSwitch.on = YES;\n [holder addSubview:_zoomSwitch];\n}\n\n- (void)didChangeZoomSwitch {\n _mapView.settings.zoomGestures = _zoomSwitch.isOn;\n}\n\n@end \nhttps://github.com/googlemaps-samples/maps-sdk-for-ios-samples/blob/86408feffd008565cd2cafce8aff3dc27f1f41bb/GoogleMaps/GoogleMapsDemos/Samples/GestureControlViewController.m#L16-L70\n\n \n```\n\nRun the full sample app locally\n\nThe Maps SDK for iOS sample app is available as a\n[download archive](https://github.com/googlemaps-samples/maps-sdk-for-ios-samples/archive/main.zip)\nfrom [GitHub](https://github.com/googlemaps-samples/maps-sdk-for-ios-samples/tree/main/GoogleMaps).\nFollow these steps to install and try the Maps SDK for iOS sample app.\n\n1. Run `git clone https://github.com/googlemaps-samples/maps-sdk-for-ios-samples.git` to clone the samples repository into a local directory.\n2. Open a terminal window, navigate to the directory where you cloned the sample files, and\n drill down into the GoogleMaps directory:\n\n Swift \n\n cd maps-sdk-for-ios-samples-main/GoogleMaps-Swift\n pod install\n open GoogleMapsSwiftDemos.xcworkspace\n\n Objective-C \n\n cd maps-sdk-for-ios-samples-main/GoogleMaps\n pod install\n open GoogleMapsDemos.xcworkspace\n\n3. In Xcode, press the compile button to [build the app](https://developer.apple.com/documentation/xcode/building-and-running-an-app) with the current scheme. The build produces an error, prompting you to enter your API key in the `SDKConstants.swift` file for Swift or`SDKDemoAPIKey.h` file for Objective-C.\n4. [Get an API key](/maps/documentation/ios-sdk/get-api-key) from your project with the [Maps SDK for iOS enabled](/maps/documentation/ios-sdk/cloud-setup#enabling-apis).\n5. Edit the `SDKConstants.swift` file for Swift or`SDKDemoAPIKey.h` file for Objective-C and paste your API key into the definition of either the `apiKey` or `kAPIKey` constant. For example: \n\n Swift \n\n ```scdoc\n static let apiKey = \"YOUR_API_KEY\"\n ```\n\n Objective-C \n\n ```objective-c\n static NSString *const kAPIKey = @\"YOUR_API_KEY\";\n ```\n6. In the `SDKConstants.swift` file (Swift) or`SDKDemoAPIKey.h` file (Objective-C), remove the following line, because it's used to register the user-defined issue: \n\n Swift \n\n ```text\n #error (Register for API Key and insert here. Then delete this line.)\n ```\n\n Objective-C \n\n ```text\n #error Register for API Key and insert here.\n ```\n7. Build and run the project. The iOS simulator window appears, showing a list of **Maps SDK Demos**.\n8. Choose one of the options displayed, to experiment with a feature of the Maps SDK for iOS.\n9. If prompted to allow GoogleMapsDemos to access your location, choose **Allow**."]]
