按下后退按鈕時，前一屏幕上的導航標題消失

Question

我有導航欄標題的問題。 我有 2 個屏幕，當我單擊屏幕 2 上的后退按鈕時，它將返回到屏幕 1，但屏幕 1 的標題消失了。 這是我的代碼片段

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];
}

我嘗試了幾種技巧來使用以下技巧使屏幕 1 的標題出現：

1. 在viewwillappear方法上設置標題

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

2. 在viewdidappear方法上設置標題

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

但標題仍然消失了。 請幫忙

---

這是我移動到下一個屏幕的方式

- (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

這解決了我的問題：

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

Answer 2

就我而言，問題是backItem?.title 。 在我的視圖控制器和UINavigationController的自定義子類中，我將其設置為空字符串：

func navigationController(_ navigationController: UINavigationController, willShow viewController: UIViewController, animated: Bool) {
    ...
    navigationController.navigationBar.backItem?.title = ""
}

我的猜測是，當使用popViewController(animated:) ，標題取自backItem?.title並設置為主標題屬性。

Answer 3

在viewWillAppear實現：

self.navigationItem.title="Title text";

Answer 4

它通常在您設置 backItem?.title = "" 時發生，因為后部控制器的標題取自此屬性我幾個月來就遇到了這個問題，僅通過評論這一行就解決了

Answer 5

Objective c解決方案：

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

Answer 6

為我工作解決方案。 你可以試試這個：

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

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

Answer 7

我來自 Swift 世界。 但是我嘗試了很多解決方案。 這些都是由動畫引起的。 如果您將 Bool 更改為 false，它將解決您的問題。 最后，您可以將代碼放入 viewWillAppear 函數中。

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