iPhone UINavigationController 问题（按钮、标题不可见）

发布于 2024-10-01 14:52:16 字数 483 浏览 1 评论 0原文

我的 UINavigationController 有两个问题。

问题 1

在初始视图中，我以编程方式添加了一个 rightBarButtonItem。

当我将导航视图推到右侧时，一切正常，并且出现一个带有上一个视图标题的后退按钮。

当我点击后退按钮时，我就回来了。但后来这个按钮就消失了。但它并没有真正消失，它只是不可见，因为它仍然可以被单击。

问题2

当我推送右侧的viewController时，无法设置标题。我在推送视图之前尝试过

myViewController.title = @"someTitle";

，并且也在 viewController 内部尝试过，

self.title = @"someTitle";

但这里没有任何效果。

原文

I have two problems with the UINavigationController.

Problem 1

On the initial view I programmatically added a rightBarButtonItem.

When I push the navigationView to the right, everything works right and it appears a back button with the title of the previous view.

When I click the back button, I get back. But then this button is gone. But it's not really gone, it's just invisible, because it can still be clicked.

Problem 2

When I push the viewController on the right, I can't set the title. I tried it before pushing the view with

myViewController.title = @"someTitle";

and I tried it also inside of the viewController with

self.title = @"someTitle";

but nothing works here.

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凶凌 2024-10-08 14:52:16

我发现问题：

我正在向导航栏添加自定义背景图像。不知何故，这张图片超出了标题/按钮。

因此，如果您想实现自定义背景图像，不要使用此：

UIImageView *backgroundImage = [[UIImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 44.0)];
[backgroundImage setImage:[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"headerBg" ofType:@"png"]]];
[navigationController.navigationBar insertSubview:backgroundImage atIndex:0];
[backgroundImage release];

而是使用此：

@implementation UINavigationBar (CustomImage)
- (void)drawRect:(CGRect)rect {
    UIImage *image = [UIImage imageNamed: @"headerBg.png"];
    [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}
@end

I found the problem:

I was adding a custom background image to the navigationBar. Somehow this image got over the title / button.

So if you ever want to implement a custom background image, don't user this:

UIImageView *backgroundImage = [[UIImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, 320.0, 44.0)];
[backgroundImage setImage:[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"headerBg" ofType:@"png"]]];
[navigationController.navigationBar insertSubview:backgroundImage atIndex:0];
[backgroundImage release];

But instead, use this:

@implementation UINavigationBar (CustomImage)
- (void)drawRect:(CGRect)rect {
    UIImage *image = [UIImage imageNamed: @"headerBg.png"];
    [image drawInRect:CGRectMake(0, 0, self.frame.size.width, self.frame.size.height)];
}
@end

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