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Linking #

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Linking gives you a general interface to interact with both incoming and outgoing app links.

Basic Usage #

Handling deep links #

If your app was launched from an external url registered to your app you can access and handle it from any component you want with

componentDidMount() {
  var url = Linking.getInitialURL().then((url) => {
    if (url) {
      console.log('Initial url is: ' + url);
    }
  }).catch(err => console.error('An error occurred', err));
}

NOTE: For instructions on how to add support for deep linking on Android, refer Enabling Deep Links for App Content - Add Intent Filters for Your Deep Links.

NOTE: For iOS, in case you also want to listen to incoming app links during your app's execution you'll need to add the following lines to you *AppDelegate.m:

#import "RCTLinkingManager.h"

- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url
  sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{
  return [RCTLinkingManager application:application openURL:url
                      sourceApplication:sourceApplication annotation:annotation];
}

// Only if your app is using [Universal Links](https://developer.apple.com/library/prerelease/ios/documentation/General/Conceptual/AppSearch/UniversalLinks.html).
- (BOOL)application:(UIApplication *)application continueUserActivity:(NSUserActivity *)userActivity
 restorationHandler:(void (^)(NSArray * _Nullable))restorationHandler
{
 return [RCTLinkingManager application:application
                  continueUserActivity:userActivity
                    restorationHandler:restorationHandler];
}

And then on your React component you'll be able to listen to the events on Linking as follows

componentDidMount() {
  Linking.addEventListener('url', this._handleOpenURL);
},
componentWillUnmount() {
  Linking.removeEventListener('url', this._handleOpenURL);
},
_handleOpenURL(event) {
  console.log(event.url);
}

Note that this is only supported on iOS.

Opening external links #

To start the corresponding activity for a link (web URL, email, contact etc.), call

Linking.openURL(url).catch(err => console.error('An error occurred', err));

If you want to check if any installed app can handle a given URL beforehand you can call

Linking.canOpenURL(url).then(supported => {
  if (!supported) {
    console.log('Can\'t handle url: ' + url);
  } else {
    return Linking.openURL(url);
  }
}).catch(err => console.error('An error occurred', err));

Methods #

static addEventListener(type: string, handler: Function) #

Add a handler to Linking changes by listening to the url event type and providing the handler

@platform ios

static removeEventListener(type: string, handler: Function) #

Remove a handler by passing the url event type and the handler

@platform ios

static openURL(url: string) #

Try to open the given url with any of the installed apps.

You can use other URLs, like a location (e.g. "geo:37.484847,-122.148386"), a contact, or any other URL that can be opened with the installed apps.

NOTE: This method will fail if the system doesn't know how to open the specified URL. If you're passing in a non-http(s) URL, it's best to check {@code canOpenURL} first.

NOTE: For web URLs, the protocol ("http://", "https://") must be set accordingly!

static canOpenURL(url: string) #

Determine whether or not an installed app can handle a given URL.