将图像添加到导航栏 [英] Adding image to navigation bar

问题描述

我想要一张图片来占据所有导航栏。这是基于导航的应用程序附带的导航。它出现在RootViewController上，附带UITableView。我已经看到了一些如何工作的例子。

I'd like an image to take up all of a navigation bar. This is the navigation that comes with a navigation based app. It appears on the RootViewController with the accompanying UITableView. I've seen some examples of how this might work.

设置导航栏标题：

UIImage *image = [UIImage imageNamed:@"TableviewCellLightBlue.png"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
[self.navigationController.navigationBar.topItem setTitleView:imageView];

问题在于它只涵盖标题而不是整个导航栏。

The problem there is it only covers the title rather than the entire navigation bar.

还有这个帖子： http：/ /discussions.apple.com/message.jspa?messageID=9254241#9254241 。接近最后，该解决方案看起来使用了一个我不使用的标签栏。设置导航栏背景是否复杂？还有其他一些更简单的技术吗？

There is also this thread: http://discussions.apple.com/message.jspa?messageID=9254241#9254241. Towards the end, the solution looks to use a tab bar, which I'm not using. It is that complicated to set a navigation bar background? Is there some other simpler technique?

我想有一个导航背景，仍然可以使用标题文字。

I'd like to have a background for the navigation and still be able to use title text.

推荐答案

在您的情况下，在另一个答案中找到此解决方案会很好。

In your case, this solution found in another answer would work well.

将CustomImage类别添加到UINavigationBar，
即可然后只需致电：

With the "CustomImage" category added to UINavigationBar, you can then just call:

UINavigationBar *navBar = self.navigationController.navigationBar;
UIImage *image = [UIImage imageNamed:@"yourNavBarBackground.png"];
[navBar setBackgroundImage:image];

此代码应采用方法

- (void)viewWillAppear:(BOOL)animated

您想要拥有自定义图像的视图控制器。
而且，在这种情况下你最好打电话：

of the view controller where you want to have the custom image. And, in that case you should better call:

[navBar clearBackgroundImage]; // Clear any previously added background image

（否则会多次添加... ）

before setBackgroundImage (otherwise it will be added multiple times...)

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