如何在导航栏中创建后退按钮

我有2页。第一个是tableView，第二个是查看
，当我点击任何单元格时，以方式模式segue进入下一页（视图）。
我想要在导航栏的下一页中添加后退按钮。这是我在视图页面中的代码：
ViewController.m

I have 2 page. first is tableView and second is view when I to click on any cell go on to next page (view) in way modal segue. I want add back button in next page of navigation bar . this is my code in view page : ViewController.m

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.lable.text = obji.Name;
    self.lable2.text = obji.Descript;

    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStyleBordered target:self action:@selector(Back)];
    self.navigationItem.leftBarButtonItem = backButton;
}

- (IBAction)Back
{
    //I dont know that how return pervious page
}