Uinavigationitem后退按钮不可见，直到我点击导航的左侧。 bar

Question

我有3个视图控制器（VC）AB C.首先我呈现A.然后我推B，然后推C.当我推C后，我从堆栈中删除B，所以如果用户按下返回键。我用这个代码推C和删除B：

UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Nazaj" style:UIBarButtonItemStylePlain target:nil action:nil]; 

    //we push C 
    PorabaControllerR *anotherViewController = [[PorabaControllerR alloc] initWithNibName:@"PorabaViewR" bundle:nil]; 
    //[anotherViewController setTitle:@"Pregled porabe"]; 
    [anotherViewController.navigationItem setBackBarButtonItem:backButton]; 
    [self.navigationController pushViewController:anotherViewController animated:YES]; 
    [anotherViewController release]; 

    //we remove B from the stack 
    NSMutableArray *allControllers = [[NSMutableArray alloc] initWithArray:self.navigationController.viewControllers]; 

    [allControllers removeObjectAtIndex:[allControllers count] - 2]; 
    //[allControllers objectAtIndex:[allControllers count] - 2] 
    [self.navigationController setViewControllers:allControllers animated:NO]; 
    [allControllers release]; 

问题是，uinav。项目的后退按钮不会显示在C上，直到我走到它上面并点击它。 （在B上是OK）。 如何在执行过程中调试它或者观看按钮标题更改有没有什么好方法？ 有没有其他想法？

编辑：我试着用维杰的想法：

UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Nazaj" style:UIBarButtonItemStylePlain target:self action:@selector(leftBarButtonClick:)]; 

-(IBAction)leftBarButtonClick:(UIButton *) sender { 

NSLog(@"clicked left"); 
//back to home screen 
[self.navigationController popToRootViewControllerAnimated:YES]; 

}

，但此功能未在所有打来电话，后退按钮仍然隐藏，直到我走了过来，并点击它。

Answer 1

我这个代码解决它里面：

UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Nazaj" style:UIBarButtonItemStylePlain target:nil action:nil]; 

    PorabaControllerR *anotherViewController = [[PorabaControllerR alloc] initWithNibName:@"PorabaViewR" bundle:nil]; 
    [anotherViewController.navigationItem setBackBarButtonItem:backButton]; 

    NSMutableArray *allControllers = [[NSMutableArray alloc] initWithArray:self.navigationController.viewControllers]; 

    [allControllers removeObjectAtIndex:1]; //we remove B 
    [allControllers insertObject:anotherViewController atIndex:1]; //we push C 
    [self.navigationController setViewControllers:allControllers animated:YES]; 
    [allControllers release]; 

Answer 2

只需在你的backbarbutton或leftbarbutton动作中使用此代码即可。

乌尔功能

[self.navigationController popToRootViewControllerAnimated:YES]; 

OR

[self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:0] animated:YES];