VSPNavigationManager *manager = [[VSPNavigationManager alloc] initWithURLScheme:@"my-app"];

// Register the route matching URL my-app://home/posts/123xyz
[manager registerNavigationForRoute:@"/home/posts/:post_id" handler:^VSPNavigationNode *(NSDictionary *parameters) {
    VSPNavigationNode *root = [VSPNavigationNode rootNodeForParameters:parameters nodeIds:RootNodeId, NewsFeedNodeId, PostNodeId, nil];
    root.leaf.viewController = [PostViewController postViewControllerWithPostId:parameters[@"post_id"]];
    return root;
}];

// Define presentation and dismissal rules
[self addRuleForHostNodeId:NewsFeedNodeId childNodeId:PostNodeId mountBlock:^RACSignal *(VSPNavigationNode *parent, VSPNavigationNode *child) {
    return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
        [parent.viewController presentViewController:child.viewController animated:animated completion:^{
            [subscriber sendCompleted];
        }];
        return nil;
    }];
} unmounBlock:^RACSignal *(VSPNavigationNode *parent, VSPNavigationNode *child) {
    return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
        [child.viewController dismissViewControllerAnimated:animated completion:^(BOOL finished){
            [subscriber sendCompleted];
        }]
        return nil;
    }];
}];