如何在第一次查看时隐藏 UINavigationBar

发布于 2024-12-01 07:56:23 字数 526 浏览 0 评论 0原文

我想隐藏仅在第一个视图中自动加载导航项目的 UINavigationBar，并且想知道如何才能完成这项工作。

我尝试这样做

//RootViewController.m

#import "mydelegate.h" //-- this is where the view controller is initialized

//...

- (void)viewDidLoad
{
    [super viewDidLoad];
    navigationController *navController = [[navigationController alloc] init];
    [navigationController setNavigationBarHidden:YES animated:animated];
}

//.....

但是我收到错误，因为我想我没有正确地从委托文件中调用 navigationController 或者这不可能像来自另一个类的方法那样调用它。

任何帮助将不胜感激。

原文

I am wanting to hide the UINavigationBar that automatically loads with the Navigation project for the first view only and am wondering how I can make this work.

I have tries to do it like this

//RootViewController.m

#import "mydelegate.h" //-- this is where the view controller is initialized

//...

- (void)viewDidLoad
{
    [super viewDidLoad];
    navigationController *navController = [[navigationController alloc] init];
    [navigationController setNavigationBarHidden:YES animated:animated];
}

//.....

However I am getting errors because I guess I am not calling navigationController across from the delegate file properly or this is just not possible to call it like you would a method from another class.

Any help would be greatly appreciated.

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白昼 2024-12-08 07:56:23

这里有一些问题。

您应该使用 self.navigationController 访问呈现视图控制器的导航控制器。您的代码片段正在创建一个新的 UINavigationController；隐藏那个酒吧不会给你带来任何好处。
您不应将导航栏隐藏在 viewDidLoad 中，而应将其隐藏在 viewWillAppear: 中。您可以在 viewDidLoad 中隐藏导航栏，并且当视图最初呈现时导航栏将被隐藏，但是如果您要推送另一个呈现导航栏的视图并点击后退按钮，导航栏将保持可见。

您的 viewWillAppear: 应该看起来像这样：

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self.navigationController setNavigationBarHidden:YES animated:animated];
}

并且您在此导航控制器上推送的其他视图控制器中的 viewWillAppear: 方法应该适当地显示或隐藏导航栏。

There are a couple things wrong here.

You should be accessing the navigation controller that's presenting your view controller by using self.navigationController. Your code snippet is creating a new UINavigationController; hiding that bar won't get you anything.
Instead of hiding the navigation bar in viewDidLoad, you should hide it in viewWillAppear:. You can hide the navigation bar in viewDidLoad, and the navigation bar will be hidden when the view is initially presented, but if you were to push another view that presented the navigation bar and hit the back button, the navigation bar would remain visible.

Your viewWillAppear: should look something like this:

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self.navigationController setNavigationBarHidden:YES animated:animated];
}

And the viewWillAppear: methods in other view controllers you push on this navigation controller should show or hide the navigation bar appropriately.

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