将你的按钮保存在一个强outlet中(让我们称之为myButton)，然后添加/删除它:

// Get the reference to the current toolbar buttons
NSMutableArray *toolbarButtons = [self.toolbarItems mutableCopy];

// This is how you remove the button from the toolbar and animate it
[toolbarButtons removeObject:self.myButton];
[self setToolbarItems:toolbarButtons animated:YES];

// This is how you add the button to the toolbar and animate it
if (![toolbarButtons containsObject:self.myButton]) {
    // The following line adds the object to the end of the array.  
    // If you want to add the button somewhere else, use the `insertObject:atIndex:` 
    // method instead of the `addObject` method.
    [toolbarButtons addObject:self.myButton];
    [self setToolbarItems:toolbarButtons animated:YES];
}

因为它存储在输出中，所以即使它不在工具栏上，您也将保留对它的引用。

自定义

当栏按钮项被禁用时，将文本颜色设置为透明颜色可能是一个更干净的选项。你不需要在评论中解释什么奇怪的事情。此外，您不会破坏按钮，因此您仍然保留任何相关的故事板segue。

[self.navigationItem.rightBarButtonItem setTitleTextAttributes:@{NSForegroundColorAttributeName:[UIColor clearColor]}
                                                      forState:UIControlStateDisabled];

然后当你想隐藏栏按钮项时，你可以这样做:

self.navigationItem.rightBarButton.enabled = NO;

虽然没有隐藏属性，但结果是一样的。

我的答案是斯威夫特!

if $0 {
    self.navigationItem.rightBarButtonItems = [UIBarButtonItem(customView: self.button1)]
} else {
    self.navigationItem.rightBarButtonItems = [UIBarButtonItem(customView: self.button2)]
}

我认为我将根据lnafziger接受的答案分享一些帮助方法，因为我在每个工具栏中都有多个按钮:

-(void) hideToolbarItem:(UIBarButtonItem*) button inToolbar:(UIToolbar*) toolbar{
    NSMutableArray *toolbarButtons = [toolbar.items mutableCopy];
    [toolbarButtons removeObject:button];
    [toolbar setItems:toolbarButtons animated:NO];
}

-(void) showToolbarItem:(UIBarButtonItem*) button inToolbar:(UIToolbar*) toolbar atIndex:(int) index{
    NSMutableArray *toolbarButtons = [toolbar.items mutableCopy];
    if (![toolbarButtons containsObject:button]){
        [toolbarButtons insertObject:button atIndex:index];
        [self setToolbarItems:toolbarButtons animated:YES];
    }
}

我的解是设定边界。宽度为0，你有什么UIBarButtonItem(我使用这种方法与UIButton和UISearchBar):

隐藏:

self.btnXXX.bounds = CGRectMake(0,0,0,0);

显示:

self.btnXXX.bounds = CGRectMake(0,0,40,30); // <-- put your sizes here