Universal Links while app is not running - ios

Question

I am implementing Universal Links in my app. Every things works for me, except when the app is not running in the background. In that case how i can open a specific page in my app? iOS launches my app but i am not getting any callback in
- (BOOL)application:(UIApplication *)application continueUserActivity:(NSUserActivity *)userActivity restorationHandler:(void (^)(NSArray *))restorationHandler
in this function neither i am getting any url with this line
NSURL *launchURL = [launchOptions valueForKey:UIApplicationLaunchOptionsURLKey];
inside
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions this function.
Does anybody have an idea how i can get the url which caused to launch my application.
Thanks

Answer 1

You can access to your url in this way ...
NSDictionary *aux = [launchOptions objectForKey:UIApplicationLaunchOptionsUserActivityDictionaryKey];
if (aux) {
NSUserActivity *activity = [aux objectForKey:#"UIApplicationLaunchOptionsUserActivityKey"];
NSString *urlString = activity.webpageURL.absoluteString;
}
But for better use you have to validate this URL and return YES if you can manage it
For example ...
if([urlString hasPrefix:#"https://myUrl.com"]) {
return YES;
}
.. after this the method
- (BOOL)application:(UIApplication *)application continueUserActivity:(NSUserActivity *)userActivity restorationHandler:(void (^)(NSArray *))restorationHandler
It will be called

Answer 2

When you open a Universal Link with your app
- (BOOL)application:(UIApplication *)app
openURL:(NSURL *)url
options:(NSDictionary<NSString *,
id> *)options
is called with the Universal Link as a parameter and options if it is the case. Check apple docs for details.

Answer 3

In Swift 5 with a SceneDelegate file it will call:
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) { }
When your app is NOT running in background and user clicks on a universal link.

Answer 4

You need to implement
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication
annotation:(id)annotation{
url= yourappurl://with some app link data
sourceApplication= //who called your application
}
For example if your app is called from facebook messenger, then you will get
sourceApplication=#"com.facebook.messenger"