How to set "back" button in iOS application

1. Add following method in .m file

-(void)backToMain:(id)sender

{

    ViewController *toHome =[[ViewController alloc] initWithNibName:@"ViewController_iPhone" bundle:nil];

    [self presentModalViewController:toHome animated:YES];         

}

2. Add following code in .m file  (void)viewDidLoad method

    UINavigationBar *naviBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0,           [UIScreen mainScreen].bounds.size.width, 44)];

    naviBar.delegate = self;
    naviBar.tintColor = [UIColor blueColor];

    

    UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithTitle:@"Back"  style:UIBarButtonItemStyleBordered target:self action:@selector(backToMain:)];

    

    UINavigationItem *naviItem = [[UINavigationItem alloc] init];

    naviItem.leftBarButtonItem = backItem;
    naviBar.items = [NSArray arrayWithObjects:naviItem, nil];
    [self.view addSubview:naviBar];

1. Add following method in .h file

-(IBAction) backToMain:(id)sender;