Info windows

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An info window appearing over a marker.

An info window allows you to display information to the user when they tap on a marker.

An info window is drawn oriented against the device's screen, centered above its associated marker. The default info window contains the title in bold, with the snippet text below the title.

The contents of the info window are defined by the title and snippet properties of the marker. Clicking the marker does not display an info window if both the title and snippet properties are blank or nil.

Only one info window is displayed at a time. If a user taps on another marker, the current window is hidden and the new info window opens. If the user clicks on a marker that is currently showing an info window, that info window closes and reopens.

Create a custom info window to add additional text or images. A custom info window gives you complete control of the appearance of the popup.

Add an info window

The following snippet creates a simple marker, with only a title for the text of the info window.

Swift

let position = CLLocationCoordinate2D(latitude: 51.5, longitude: -0.127)
let london = GMSMarker(position: position)
london.title = "London"
london.map = mapView
      

Objective-C

CLLocationCoordinate2D position = CLLocationCoordinate2DMake(51.5, -0.127);
GMSMarker *london = [GMSMarker markerWithPosition:position];
london.title = @"London";
london.map = mapView;
      

With the snippet property, you can add additional text that will appear below the title in a smaller font. Strings that are longer than the width of the info window are automatically wrapped over several lines. Very long messages may be truncated.

Swift

london.title = "London"
london.snippet = "Population: 8,174,100"
london.map = mapView
      

Objective-C

london.title = @"London";
london.snippet = @"Population: 8,174,100";
london.map = mapView;
      

Show/hide an info window

Info windows are designed to respond to user touch events on the marker. You can show or hide an info window programmatically by setting the selectedMarker property of GMSMapView:

  • Set selectedMarker to the name of the marker to show it.
  • Set selectedMarker to nil to hide it.

Swift

london.title = "London"
london.snippet = "Population: 8,174,100"
london.map = mapView
// Show marker
mapView.selectedMarker = london
// Hide marker
mapView.selectedMarker = nil
      

Objective-C

london.title = @"London";
london.snippet = @"Population: 8,174,100";
london.map = mapView;
// Show marker
mapView.selectedMarker = london;
// Hide marker
mapView.selectedMarker = nil;
      

Setting an info window to refresh automatically

Set tracksInfoWindowChanges on the marker to YES or true if you want new properties or the content of the info window to be immediately displayed when changed, rather than having to wait for the info window to hide and then show again. The default is NO or false.

Swift

london.tracksInfoWindowChanges = true
      

Objective-C

london.tracksInfoWindowChanges = YES;
      

To decide when to set the tracksInfoWindowChanges property, you should weigh up performance considerations against the advantages of having the info window redrawn automatically. For example:

  • If you have a series of changes to make, you can change the property to YES then back to NO.
  • When an animation is running or the contents are being loaded asynchronously, you should keep the property set to YES until the actions are complete.

Refer also to the notes for consideration when using the iconView property of the marker.

Changing the position of an info window

An info window is drawn oriented against the device's screen, centered above its associated marker. You can alter the position of the info window relative to the marker by setting the infoWindowAnchor property. This property accepts a CGPoint, defined as an (x,y) offset where both x and y range between 0.0 and 1.0. The default offset is (0.5, 0.0), that is, the center top. Setting the infoWindowAnchor offset is useful for aligning the info window against a custom icon.

Swift

london.infoWindowAnchor = CGPoint(x: 0.5, y: 0.5)
london.icon = UIImage(named: "house")
london.map = mapView
      

Objective-C

london.infoWindowAnchor = CGPointMake(0.5, 0.5);
london.icon = [UIImage imageNamed:@"house"];
london.map = mapView;
      

Handling events on info windows

You can listen to the following info window events:

To listen to events, you must implement the GMSMapViewDelegate protocol. See the guide to events and the list of methods on the GMSMapViewDelegate.

GitHub includes samples that demonstrates how to handle info window events:

Custom info windows

Customize the contents of info windows by creating a subclass of UIView that defines the layout of the custom info window. In that subclass, define the view however you'd like. For example, you can use custom UILabel instances to display title and snippet text and other views, such as UIImageView instances, to add images displayed in the info window.

Ensure that your ViewController implements the GMSIndoorDisplayDelegate protocol and defines a listener for the mapView:markerInfoWindow: event. This event listener is called when a marker is about to become selected, and lets you return an instance of your custom UIView class to define the custom info window used by the marker.

The images below show a default info window, an info window with customized contents, and an info window with customized frame and background.

Info Window Comparison

The code samples on GitHub provided with the Maps SDK for iOS include samples of custom info windows. For example, see the definition of MarkerInfoWindowViewController.m (Objective-C) or MarkerInfoWindowViewController.swift (Swift).

See code samples for information on downloading and running these samples.