Question

我有3个视图控制器（VC）AB C.首先我提出A.然后我按B然后我按C.我按C后，我从堆栈中删除B，所以如果他按下，用户将返回A返回键。我使用此代码来推送C并删除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];

问题在于uinav。 item的后退按钮不会显示在C上，直到我上面并单击它。（在B上没问题）。有没有什么好方法可以在执行期间调试它或者回看按钮标题更改？还有其他想法吗？

编辑：我尝试使用Vijay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];

}

但根本没有调用此函数，后退按钮仍然隐藏，直到我查看并单击它。

Answer 1

只需在ur backbarbutton或leftbarbutton操作中使用此代码即可。

在你的内部功能

[self.navigationController popToRootViewControllerAnimated:YES];

OR

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

Answer 2

我用这段代码解决了它：

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];

Uinavigationitem后退按钮不可见，直到我点击导航的左侧。酒吧

2 个答案: