Question

我的导航栏标题有问题。我有2个屏幕，当我点击屏幕2上的后退按钮时它将返回到屏幕1，但屏幕1的标题消失。这是我的代码段

screen1 .m

    - (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    self.title = @"title 1";
....

屏幕2 .m

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    self.title = self.stringTitle;

    // change the back button and add an event handler
    self.navigationItem.hidesBackButton = YES;
    //set custom image to button if needed
    UIImage *backButtonImage = [UIImage imageNamed:@"btn_back.png"];
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setImage:backButtonImage forState:UIControlStateNormal];
    button.frame = CGRectMake(-12, 2, backButtonImage.size.width, backButtonImage.size.height);
    [button addTarget:self action:@selector(backAction) forControlEvents:UIControlEventTouchUpInside];

    UIView *backButtonView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, backButtonImage.size.width-15, backButtonImage.size.height)];
    [backButtonView addSubview:button];

    UIBarButtonItem *customBarItem = [[UIBarButtonItem alloc] initWithCustomView:backButtonView];
    self.navigationItem.leftBarButtonItem = customBarItem;

    self.navigationController.navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName: [UIColor whiteColor]};
....
}

- (void) backAction
{
    [self.navigationController popViewControllerAnimated:YES];
}

我尝试了几个技巧来制作屏幕1的标题，并带有以下技巧：

在viewwillappear方法

上设置标题

- (void)viewWillAppear:(BOOL)animated{self.title = @"tes";}

在viewdidappear方法

上设置标题

 - (void)viewDidAppear:(BOOL)animated{
 self.navigationController.navigationBar.topItem.title = @"YourTitle";
  self.title = @"tes";
  }

但标题仍然消失。请帮忙

这是我移动到下一个屏幕的方式

- (IBAction)btGenerateTokenAction:(id)sender {
    SofttokenResultController *controller = [[SofttokenResultController alloc] initWithNibName:@"SofttokenResultController" bundle:nil];

    controller.navigationController.navigationBar.backItem.title = @"Kembali";
    [ViewLoadingUtil animateToNextView:controller from:self :@""];
}

+ (void) animateToNextView:(UIViewController *)controller from:(UIViewController *)fromController :(NSString *)navTitle{

    NSLog(@"animateToNextView called");

    [fromController.navigationController pushViewController:controller animated:YES];
}

Answer 1

这解决了我的问题：

override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated: animated)
        self.navigationItem.title="Title text"
}

Answer 2

在viewWillAppear中执行此操作：

self.navigationItem.title="Title text";

Answer 3

通常在你设置 backItem?.title = "" 时发生，因为后台控制器的标题是从这个属性中获取的我从几个月来就遇到了这个问题，只是通过评论这一行就解决了

Answer 4

Objective c解决方案：

- (void) viewWillAppear:(BOOL)animated {
    [super viewWillAppear: animated];
    self.navigationItem.title = @"Title text";
}

Answer 5

就我而言，UINavigationController就是问题所在。在我的视图控制器和func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) { ... navigationController.navigationBar.backItem?.title = "" }的自定义子类中，我将其设置为空字符串：

popViewController(animated:)

我的猜测是，当使用backItem?.title时，标题取自$.ajax({ url: 'xxx.php', data:formData, cache: false, contentType:false, processData:false, type: 'post', success: function(response) { //do something }并设置为主标题属性。

Answer 6

为我工作解决方案。你可以尝试这个：

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

    self.navigationController?.navigationBar.topItem?.title = ""
    self.navigationItem.title = "Title"
}

Answer 7

我来自斯威夫特世界。但是我试了很多解决方案。这些是由动画引起的。如果将Bool更改为false，它将解决您的问题。最后，您可以将代码放在viewWillAppear函数中。

override func viewWillAppear(animated: Bool) {
    if animated {
        //...
    }
}

按下后退按钮时，前一屏幕上的导航标题消失

7 个答案: