ios - 如何重新加载导航栏

Question

在UITableView我self.navigationItem.leftBarButtonItem用一个按钮配置。现在我想重新加载此按钮以更新此按钮上的文本，但它在Navigation bar. UITableView我可以更新

 [self.tableView reloadData]

但是如何更新导航栏？

更新：我不是初始化按钮的标题，而是重新加载它。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。

score 3 · Accepted Answer

只需更改 leftBarButtonItem 上的文本？

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

score 2 · Accepted Answer

尝试这个

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];

score 1 · Accepted Answer

尝试这个：

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

score 1 · Accepted Answer

1

您是否尝试设置文本，使用

self.navigationItem.leftBarButtonItem.title

于 2013-02-02T11:27:22.877 回答

score 1 · Accepted Answer

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];

score 1 · Accepted Answer

您需要使用以下语句：

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。这将重新加载带有动画的按钮文本。如果您有兴趣在某个时候更改后退按钮，这同样适用于后退按钮。

score 1 · Accepted Answer

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

//ViewdidLoad

 btnQuestion = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 20, 25)];
        [btnQuestion setBackgroundImage:[UIImage imageNamed:@"question-mark2x"] forState:UIControlStateNormal];
        [btnQuestion addTarget:self action:@selector(goBacktomain)
              forControlEvents:UIControlEventTouchUpInside];
        barBtnBack =[[UIBarButtonItem alloc] initWithCustomView:btnQuestion];
    [self.navigationItem setLeftBarButtonItem:barBtnBack];

注意-当您想更改导航按钮标题时更改 btnQuestion 标题

score 0 · Accepted Answer

我在 Swift 中解决了它，但是如果显示键盘，它就会隐藏。

navigationController?.loadView()

ios - 如何重新加载导航栏

8 回答 8

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