How to pop back to root view controller but then push to a different view?

Question

I am writing a simple application that has 3 view controllers. The root view controller is an item listing, basic table view. Off of this view controller, I push two different view controllers based on some user interaction - a create item view controller or a view item view controller.

So, the storyboard segues just look like a V, or something.

On my create item view controller, I would like it to pop back to the root view controller when the user creates a new item, but then push to the view item controller so that I can look at the newly created item.

I can't seem to get this to work. It's easy enough to pop back to the root view controller, but I'm unable to push that view item controller.

Any ideas? I've pasted my code, below. The pop function works, but the new view never appears.

- (void) onSave:(id)sender {

    CLLocation *currentLocation = [[LocationHelper sharedInstance] currentLocation];

    // format the thread object dictionary
    NSArray* location = @[ @(currentLocation.coordinate.latitude), @(currentLocation.coordinate.longitude) ];
    NSDictionary* thread = @{ @"title": _titleField.text, @"text": _textField.text, @"author": @"mustached-bear", @"location": location };

    // send the new thread to the api server
    [[DerpHipsterAPIClient sharedClient] postPath:@"/api/thread"
                                       parameters:thread
                                          success:^(AFHTTPRequestOperation *operation, id responseObject) {

                                              // init thread object
                                              Thread *thread = [[Thread alloc] initWithDictionary:responseObject];

                                              // init view thread controller
                                              ThreadViewController *viewThreadController = [[ThreadViewController alloc] init];
                                              viewThreadController.thread = thread;

                                              [self.navigationController popToRootViewControllerAnimated:NO];
                                              [self.navigationController pushViewController:viewThreadController animated:YES];

                                          }
                                          failure:^(AFHTTPRequestOperation *operation, NSError *error) {

                                              [self.navigationController popToRootViewControllerAnimated:YES];

                                          }];

}

Answer 1

If I understand you correctly, you have a stack of view controllers:

A (root) - B - C - D - E

And you want it to become:

A (root) - F

Right? In that case:

NSArray *viewControllers = self.navigationController.viewControllers;
NSMutableArray *newViewControllers = [NSMutableArray array];

// preserve the root view controller
[newViewControllers addObject:[viewControllers objectAtIndex:0]];
// add the new view controller
[newViewControllers addObject:viewThreadController];
// animatedly change the navigation stack
[self.navigationController setViewControllers:newViewControllers animated:YES];

Swift 4

// get current view controllers in stack and replace them
let viewControllers = self.navigationController!.viewControllers
let newViewControllers = NSMutableArray()

// preserve the root view controller
newViewControllers.add(viewControllers[0])
// add the new view controller
newViewControllers.add(viewThreadController)
// animatedly change the navigation stack
self.navigationController?.setViewControllers(newViewControllers as! [UIViewController], animated: true)