UINavigationBar的自定义样式无法正常工作 [英] Custom styling of UINavigationBar not working properly

问题描述

我正在使用此代码为所有UINavigationBars设置自定义背景图像.问题在于最终图像似乎不是视网膜大小.我研究了UINavigationBars是640x88px.那就是我的UINavigationBar.png的确切尺寸，但是我在iPhone Sim(视网膜)和我的iPhone 4(也是视网膜)上只能看到320x44px.

I am using this code to set custom background image for all UINavigationBars. The problem is that the final image does not appear to be retina size. I researched UINavigationBars are 640x88px. Thats exact dimensions of my UINavigationBar.png however I only see 320x44px on the iPhone Sim(retina) and my iphone 4 which is also retina.

设置图像的代码:

UIImage *background = [UIImage imageNamed:@"UINavigationBar.png"];
[[UINavigationBar appearance] setBackgroundImage:background forBarMetrics:UIBarMetricsDefault];

以下是用于说明的屏幕截图:

Here is a screenshot for illustration:

(区别是没有在Photoshop中出现底部暗线.在iPhone 5 Simulator(视网膜)中我只能看到一半的图像)

(the difference is there is no bottom dark line as in Photoshop. I can only see half of the image in the iPhone 5 Simulator (Retina))

我的问题是为什么会发生这种情况，我该如何解决?谢谢.

My question is why this happens and how can I fix it? Thanks.

推荐答案

您需要具有两个大小和名称相同的.png文件，但在视网膜显示文件中添加@ 2x.
例如

You need to have two .png files with different size and same name, but with @2x addition in the retina display file.
For example,

用于常规显示支持的文件1:
尺寸-320x44，
名称-UINavigationBar.png

File 1 for regular display support:
size- 320x44,
name- UINavigationBar.png

支持视网膜显示的文件2:
尺寸-640x88，
名称[e-mail]

File 2 for retina display support:
size- 640x88,
name- [e-mail]

在您的代码中，您始终使用UINavigationBar.png，根据硬件，设备将自动知道要使用的巫婆文件.

In your code you always use UINavigationBar.png, the device will automatically know witch file to use, according to the hardware.

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