ios - 按下后退按钮时，上一个屏幕上的导航标题消失

Question

我对导航栏标题有疑问。我有 2 个屏幕，当我单击屏幕 2 上的后退按钮时，它将返回到屏幕 1，但屏幕 1 的标题消失了。这是我的代码片段

屏幕1.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];
}

我已经尝试了几种技巧来使屏幕 1 的标题出现以下技巧:

1. 在viewwillappear 方法上设置标题

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

2. 在viewdidappear 方法上设置标题

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

但标题仍然消失了。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"
}