ios - iPhone 导航栏不显示设备上的所有按钮

Question

在 iPhone 模拟器的纵向模式或设备的横向模式下，它显示所有导航栏按钮，但在设备的纵向模式下使用时，该按钮不显示。下面是导航栏的图像。

我用于测试的设备是运行 iOS 6.1.3 (10B329) 的 iPhone 4S。我使用的模拟器是 Version 7.0 (463.9.4) running iOS 6.0/6.1。

我正在考虑在编辑模式下删除“搜索”按钮，但我更愿意让用户在任何模式下都可以使用此选项。

感谢任何帮助或见解，谢谢。

编辑:右侧按钮最初是在 viewDidLoad: 中为 ViewController 创建和添加的，如下所示:

_deleteBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemTrash target:self action:@selector(deleteRows:)];
_deleteBarButtonItem.tintColor = [UIColor redColor];

_searchBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:self action:@selector(searchButtonClicked:)];

self.navigationItem.rightBarButtonItems = @[_searchBarButtonItem, self.editButtonItem];

进入编辑模式时:

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

    if (self.tableView.isEditing) {
        // turn off editing
        _deleteBarButtonItem.enabled = NO;
        [self.tableView setEditing:NO animated:animated];
        [self.editButtonItem setStyle:UIBarButtonItemStylePlain];
        self.navigationItem.rightBarButtonItems = @[_searchBarButtonItem, self.editButtonItem];
    } else { 
        // turn on editing
        [self.tableView setEditing:YES animated:animated];
        [self.editButtonItem setStyle:UIBarButtonItemStyleDone];
        self.navigationItem.rightBarButtonItems = @[_searchBarButtonItem, _deleteBarButtonItem, self.editButtonItem];
    }
}

Answer 1

老实说，这很好奇。也许是标题的某些属性使其占据主导地位。根据我的经验，最好在“编辑模式”期间选择较少的选项。如果您决定走那条路，这里有一些代码可能会有所帮助。 (当然，您的变量名很可能不同)

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

if (editing) {
    // This is how you remove the button from the toolbar and animate it
    [toolbarButtons removeObject:self.myButton];
    [self setToolbarItems:toolbarButtons animated:YES];
} else {
    // 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];
    }
}