Going back when clicked the back button - Beginner - iphone

Question

I have a UIViewCOntroller, and my code is as follows.
TviewController *tviewController = [[TviewController alloc]init];
[self.navigationController pushViewController:tviewController animated:YES];
Now from TviewController i go to another viewCOntroller;
XviewController *xviewController = [[XviewController alloc]init];
[self.navigationController pushViewController:xviewController animated:YES];
in this XviewController there is a button, when i click that button i need to move BACK to the TviewController How do i do this programatically ?
note: I don't want to use pushViewController and push it further. I need to go back to the TviewController (as in clicking the back button twice)

Answer 1

Just
[self.navigationController popViewControllerAnimated:YES];
You should spend some time reading the guidelines about view controllers...

Answer 2

[self.navigationController popViewControllerAnimated:BOOL)]
[self.navigationController popToViewController:(UIViewController *) animated:(BOOL)];
[self.navigationController popToRootViewControllerAnimated:(BOOL)];
are methods to go back in hierarchy

Answer 3

there is 3 possible ways.
use popToRootViewControllerAnimated: -> to go back root view controller (first view controller)
use popViewControllerAnimated: -> to go backward 1. it's exact same way as back button.
use popToViewController:animated: -> to go back to UIViewController you want (as long as it's stack at back).
point 1 & 2 is pretty easy to implement and other answers lead you to there.
for point 3, here it is:
#class TviewController.h;
#interface XviewController : UIViewController
{
//this is XviewController.h
//you may use `#import` other than use `#class` but on some reason you can't, if you use`#import XviewController.h` in your TviewController class.
}
//XviewController.m
#import TviewController.h
#import XviewController.h
#implementation
-(IBAction) backTviewController
{
for ( UIViewController *viewController in self.navigationController.viewControllers )
if ( [viewController isMemberOfClass:[TviewController class]]{
[self.navigationController popToViewController:viewController animated:YES];
break;
}
}