当前左边栏按钮的默认值是加载当前视图的视图的标题,换句话说,当按下按钮(后退按钮)时显示的视图。

我想把按钮上显示的文本更改为其他内容。

我试着把下面这行代码放在视图控制器的viewDidLoad方法中,但它似乎不起作用。

self.navigationItem.leftBarButtonItem.title = @"Log Out";

我该怎么办?

谢谢。


当前回答

我在iOS新,但我会提供我的覆盖导航控制器类的非常简单的答案。 我有简单的覆盖推和弹出方法,并保存以前的视图控制器的标题。抱歉在js block中进行了粘贴。有点困惑如何过去它在正常的代码块。

#import "MyCustomNavController.h" @implementation MyCustomNavController { NSString *_savedTitle; } - (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated withBackBtnTitle:(NSString *)title { _savedTitle = self.topViewController.title; self.topViewController.title = title; [super pushViewController:viewController animated:animated]; } - (UIViewController *)popViewControllerAnimated:(BOOL)animated { [self.viewControllers objectAtIndex:self.viewControllers.count - 2].title = _savedTitle; return [super popViewControllerAnimated:animated]; } @end

其他回答

好的,就这么办。如果你有一个视图控制器“first”,你通过按按钮等方式导航另一个视图控制器“second”,你需要做一些工作。 首先,你需要在“second”视图控制器的ViewDidLoad方法中创建一个BarButtonItem,如下所示;

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

之后,你需要在相同的.m文件中为“btnBack”操作编写代码;

-(IBAction)OnClick_btnBack:(id)sender  {
      [self.navigationController popViewControllerAnimated:YES];
    //[self.navigationController pushViewController:self.navigationController.parentViewController animated:YES];
}

这是所有。

这段代码也可以工作。把这个放到导航控制器的根控制器上:

self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];

Most of solutions kills the original style of BackButton (The left arrowed bar button) while adding a usual button with desired title. So to keep the original style there are 2 ways: 1st: To use undocumented button style (110 or something like that) which I prefer not to do. But if you want you could find how to do it here, on stackoverflow. 2nd: To use I the Trenskow's idea. I liked it and I use it a bit changed. Instead of overriding - (NSString*)title I've decided to keep the original title in the following way (which allows me to use nib's titles as well as given title at push state btw).

- (void)viewDidLoad {
    [super viewDidLoad];
    static NSString * backButtonTitle=@"Back"; //or whatever u want

    if (![self.title isEqualToString:backButtonTitle]){

        UILabel* customTitleView = [[UILabel alloc] initWithFrame:CGRectZero];
        customTitleView.text = self.title; // original title
        customTitleView.font = [UIFont boldSystemFontOfSize:20];
        customTitleView.backgroundColor = [UIColor clearColor];
        customTitleView.textColor = [UIColor whiteColor];
        customTitleView.shadowColor = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.5];
        customTitleView.shadowOffset = CGSizeMake(0, -1);

        [customTitleView sizeToFit];

        self.navigationItem.titleView = [customTitleView autorelease];
        self.title = backButtonTitle; 
    }
}

这个解决方案效果很好,看起来很自然。此外,如果在viewDidLoad方法中使用它,它可以防止执行超过1次。 我也试过杰塞德克的解决方案,但看起来很糟糕。它导致可见的用户标题栏的变化,从原来的BackButton的期望和回来。

iOS 11+解决方案-不需要再次创建后退按钮。

将backButtonTitle设置为前一屏幕上的一个空格。

// If navigation is from A -> B, set in A's `viewDidLoad`.
navigationItem.backButtonTitle = " "

斯威夫特4 iOS 11.2 Xcode 9.2

TableViewController1  ---segue--->   TableViewController2

你可以在TableViewController1或TableViewController2中更改返回按钮的文本。

更改TableViewController1内部的返回按钮文本:

1)在viewWillAppear():

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    let myBackButton = UIBarButtonItem()
    myBackButton.title = "Custom text"
    navigationItem.backBarButtonItem = myBackButton
}

由于某种原因,viewDidLoad()还太早,不能将后退按钮添加到NavigationItem中。要连接两个tableviewcontroller,在storyboard控件中,从TableViewController1中的TableViewCell拖到TableViewController2的中间,然后在弹出菜单中选择Selection Segue > Show。

2)在tableView(_:didSelectRowAt:):

override func tableView(_ tableView: UITableView, didSelectRowAt: IndexPath) {

    let myButton = UIBarButtonItem()
    myButton.title = "Custom text"
    navigationItem.backBarButtonItem = myButton

    performSegue(withIdentifier: "ShowMyCustomBackButton", sender: nil)
}

要连接两个tableviewcontroller,在storyboard控件中,从TableViewController1上面的黄色小圆圈拖到TableViewController2中间,然后从弹出菜单中选择Manual Segue > Show。然后选择连接两个TableViewControllers的segue,在属性检查器中“Identifier”旁边输入“ShowMyCustomBackButton”。

3)在故事板中:

如果你只是需要静态的自定义文本返回按钮,为TableViewController1选择NavigationItem(它在故事板的目录表中有一个<图标),然后打开属性检查器,在“back button”字段中输入你的自定义文本(确保从该字段中tab出来,更改生效)。


更改TableViewController2内部的返回按钮文本:

1)在viewWillAppear():

class MySecondTableViewController: UITableViewController {

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        let myBackButton = UIBarButtonItem(
            title: "<Custom text",
            style: .plain,
            target: self,
            action: #selector(goBack)  //selector() needs to be paired with an @objc label on the method
        )

        navigationItem.leftBarButtonItem = myBackButton
    }

    @objc func goBack() {
        navigationController?.popViewController(animated: true)
    }

要连接两个tableviewcontroller,在storyboard控件中,从TableViewController1中的TableViewCell拖到TableViewController2的中间,然后在弹出菜单中选择Selection Segue > Show。