Uinavigationitem後退按鈕不可見，直到我點擊導航的左側。 bar

Question

我有3個視圖控制器（VC）AB C.首先我呈現A.然後我推B，然後推C.當我推C後，我從堆棧中刪除B，所以如果用戶按下返回鍵。我用這個代碼推C和刪除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]; 

問題是，uinav。項目的後退按鈕不會顯示在C上，直到我走到它上面並點擊它。 （在B上是OK）。 如何在執行過程中調試它或者觀看按鈕標題更改有沒有什麼好方法？ 有沒有其他想法？

編輯：我試着用維傑的想法：

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來電話，後退按鈕仍然隱藏，直到我走了過來，並點擊它。

Answer 1

我這個代碼解決它裏面：

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動作中使用此代碼即可。

烏爾功能

[self.navigationController popToRootViewControllerAnimated:YES]; 

OR

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