Question

I am facing a problem on UINavigationController…

I have this hierarchy

UINavigationController
 |- root controller
 |- ViewController A

and I have a button in ViewController A doing something and push ViewController B, but I want to remove ViewController A before adding ViewController B

So the hierarchy is going like this after the process

UINavigationController
 |- root controller
 |- ViewController B

It supposed to be sliding from ViewController A to ViewController B, but if you press back, it return to root Controller

Thank you in advance.

Answer 1

You should use the setViewControllers method of the UINavigationController and simply add as an array the root and viewController B

//get the existing navigationController view stack
NSMutableArray* newViewControllers = [NSMutableArray arrayWithArray:self.navigationController.viewControllers];

//drop the last viewController and replace it with the new one!
ViewControllerB *childController = [[ViewControllerB alloc] initWithNibName:@"ViewControllerB" bundle:nil];
[newViewControllers replaceObjectAtIndex:newViewControllers.count-1 withObject:self];

//set the new view Controllers in the navigationController Stack
[self.navigationController setViewControllers:newViewControllers animated:YES];