在UINavigationBar中隐藏或禁用UIBarButtonItem

Question

我正在使用模态转场来呈现一个UIViewController。这个UIViewController继承了一个UINavigationBar，我在导航栏的左侧设置了一个UIBarButtonItem： 我的问题是，当调用被呈现的UIViewController的viewWillAppear方法时，我想隐藏UIBarButtonItem，但是它总是显示出来。 我已经为UIViewController声明了一个UIBarButtonItem，名为myCancelButton，并在Interface Builder中引用它。

到目前为止，我尝试过以下方法（都没有起作用）：

- (void) viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    self.navigationItem.leftBarButtonItem = nil;
    self.navigationItem.backBarButtonItem = nil;
    self.myCancelButton = nil;

    NSMutableArray *barButtonItems = [self.navigationItem.leftBarButtonItems mutableCopy];
    [barButtonItems removeObject:self.myCancelButton];
    self.navigationItem.leftBarButtonItems = barButtonItems;

    [self.navigationItem.leftBarButtonItems delete:self.myCancelButton];

    self.navigationController.navigationItem.leftBarButtonItem = nil;
    barButtonItems = [self.navigationController.navigationItem.leftBarButtonItems mutableCopy];
    [barButtonItems removeObject:self.myCancelButton];
    self.navigationController.navigationItem.leftBarButtonItems = barButtonItems;

    [self.navigationController.navigationItem.leftBarButtonItems delete:self.myCancelButton];

    [self.myCancelButton setWidth:0.01];

    self.navigationItem.hidesBackButton = TRUE;

    //Even setting enabled to false doesn't work:
    [self.myCancelButton setEnabled:FALSE];
}

- w3bshark

Answer 1

这应该可以工作。

[self.navigationItem setHidesBackButton:YES animated:YES];

- funeralfunk

Answer 2

尝试使用这个

self.navigationController.navigationItem.leftBarButtonItem = nil;
[self.navigationController.navigationItem setHidesBackButton:YES];

- Dharmbir Singh

---

我已经在原始帖子中尝试过以下代码：self.navigationController.navigationItem.leftBarButtonItem = nil; self.navigationItem.hidesBackButton = TRUE; - w3bshark

请稍等，我有点忙。如果我有空的话，我会读这个的。 - Dharmbir Singh

你有没有机会找到解决方案？ - w3bshark