Question

Possible Duplicate:
iphone – “Pushing the same view controller instance more than once is not supported” exception

I am properly pushing test2ViewController from 1 as follows,

self.controller2 = [[test2ViewController alloc] initWithNibName:@"test2ViewController" bundle:nil anUser:self.idUser];

[[self navigationController] pushViewController:self.controller2 animated:NO];

[self.controller2 release];

from 2 to 1 I pop it after initialize 1 again (necessary to initialize).

self.controller1 = [[test1ViewController alloc] initWithNibName:@"test1ViewController" bundle:nil anUser:self.idUser];

    [[self navigationController]  popToRootViewControllerAnimated:NO];

    [self.controller1 release];

and problem appers when trying to push again 2 from 1, app crashes with an error,

Pushing the same view controller instance more than once is not supported

what am doing wrong? thank you.

Answer 1

Well first off you are creating another instance of test2ViewController so you will go to a different instance each time you change view.

What you should do:

if(!test2ViewController)
    secondView = [[test2ViewController alloc] init...];
[self navigationController pushViewController:secondView animated:NO];

and to return, simply:

[self.navigationController popViewControllerAnimated:NO];

PoppingtoRoot causes you to pop to the very first view controller that used the pushViewController method.