调用OpenUrl方法而不是continueUserActivity

Question

当用户单击通用链接时，将调用此方法：

- (BOOL)application:(UIApplication *)application
            openURL:(NSURL *)url
  sourceApplication:(NSString *)sourceApplication
         annotation:(id)annotation { }

但是根据苹果的文档，它应该被称为：

- (BOOL)application:(UIApplication *)application 
continueUserActivity:(NSUserActivity *)userActivity 
 restorationHandler:(void (^)(NSArray * _Nullable))restorationHandler { }

可能是什么原因？