Question

在UITableView中，我使用按钮配置self.navigationItem.leftBarButtonItem。现在我想重新加载此按钮以更新此按钮上的文本，但它位于Navigation bar上。我可以通过

更新UITableView

 [self.tableView reloadData]

但如何更新导航栏？

更新：我没有初始化按钮的标题，但重新加载它。所以任何初始化代码（例如self.navigationItem.leftBarButtonItem.title = @"balabala"）都不起作用，因为它不会立即生效。

Answer 1

只需更改leftBarButtonItem上的文字？

self.navigationItem.leftBarButtonItem.title = @"Back"; // or whatever text you want

Answer 2

试试这个

UIBarButtonItem *btnBack = [[UIBarButtonItem alloc]
                               initWithTitle:@"Title" 
                               style:UIBarButtonItemStyleBordered
                               target:self
                               action:@selector(OnClick:)];
self.navigationItem.leftBarButtonItem = btnBack;

希望这可以帮助你..

编辑： -

UIBarButtonItem *btnBack = [[UIBarButtonItem alloc] initWithTitle: @"Title" style: UIBarButtonItemStyleBordered target:self action:@selector(OnClick:)];

[[self navigationItem] setBackBarButtonItem: btnBack];

Answer 3

您是否尝试使用

设置文字

self.navigationItem.leftBarButtonItem.title

Answer 4

您需要使用以下声明：

self.navigationItem setLeftBarButtonItem:cancelButton animated:YES];

换句话说，您需要setLeftBarButtonItem：动画消息而不是标准消息。这将使用动画重新加载按钮文本。同样适用于后退按钮，如果您有兴趣在某些时候进行更改。

Answer 5

git branch -m trunk master

// viewDidLoad中

 @interface Myviewcontroller : UIViewController
{
       UIBarButtonItem *barBtnBack;
       UIButton *btnQuestion;
}

注意 - 当您想要更改navigationnar按钮标题时更改btnQuestion标题

Answer 6

如果您想更改NavigationBar标题，请尝试以下方法之一：

[self.navigationController.navigationItem setTitle:@"Title"];
[self.navigationItem setTitle:@"Title"];
[self setTitle:@"Title"];

如果您想更改按钮标题，请将其放在同一个类中：

- (void)setLeftBarButtonTitle:(NSString *)title action:(SEL)selector
{
    UIBarButtonItem *leftButton = [[UIBarButtonItem alloc] initWithTitle:title style:UIBarButtonItemStyleBordered target:self action:selector];
    [self.navigationItem setLeftBarButtonItem:leftButton];
}

- (void)setRightBarButtonTitle:(NSString *)title action:(SEL)selector
{
    UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:title style:UIBarButtonItemStyleBordered target:self action:selector];
    [self.navigationItem setRightBarButtonItem:rightButton];
}

设置按钮标题和操作的示例：

// Change button titles and actions any time
[self setLeftBarButtonTitle:@"Back" action:@selector(goBack)];
[self setRightBarButtonTitle:@"Something" action:@selector(doSomething:)];

// Change button titles with no actions
[self setLeftBarButtonTitle:@"Nothing" action:nil];
[self setRightBarButtonTitle:@"Nothing" action:nil];

// Remove buttons from navigation bar
[self.navigationItem setLeftBarButtonItem:nil];
[self.navigationItem setRightBarButtonItem:nil];

Answer 7

试试这个：

UIBarButtonItem *backButton = [[UIBarButtonItem alloc]
                                   initWithTitle:@"your_title"
                                   style:UIBarButtonItemStyleBordered
                                   target:self
                                   action:@selector(backBtnPressed:)];
    self.navigationItem.leftBarButtonItem = backButton;

Answer 8

我在Swift中解决了它，但是如果显示了键盘，它就会隐藏起来。

navigationController?.loadView()

如何重新加载导航栏

8 个答案: