适用于iOS的图像资源 [英] Image resources for iOS

问题描述

我可能在这里遗漏了一些明显的东西，但我一直无法解决以下问题：

I'm probably missing something obvious here, yet I've been unable to solve the following problem:

我有一个包含普通和正常图像资源的项目视网膜屏幕，如 someimage.png 和 [e-mail] ，它们存储在一个单独的包中。当我构建项目时，Xcode自动将它们打包成一个多页tiff（ imageName.tiff ），我在finder中检查了它 - 它实际上是两个图像的多重tiff 。但是，出现了一个问题：我很难加载适当的资源。

I have a project with image resources for both normal and retina screens, like someimage.png and [e-mail], which are stored in a separate bundle. When I build the project, Xcode automatically packs them into a single multipage tiff (imageName.tiff), I've checked it in finder - it is actually multipage tiff with both images. However, here comes a problem: I struggle to load appropriate resource.

我所做的是：

    NSString * imageName = ... ;

    NSLog(@"imageName: %@", imageName);

    UIImage * someImage = [UIImage imageNamed: imageName];

此外，我还提供了辅助方法，它返回包含资源的包：

Also I fave auxiliary method, which returns bundle with resources:

   +(NSBundle *) resourcesBundle
   {
         NSBundle *bundle = [NSBundle bundleWithURL:[[NSBundle mainBundle] URLForResource:@"MyResourcesBundle" withExtension:@"bundle"]];
         return bundle;
   }

我试过以下 imageName ：

imageName = [[AuxClass resourcesBundle] pathForResource:@"someimage" ofType:@"png"];

在这种情况下，我有 null for imageName 。

in this case i have null for imageName.

imageName = [[AuxClass resourcesBundle] pathForResource:@"someimage" ofType:@"tiff"];

在这种情况下会返回确认图像路径，但只有在我使用 imageWithContentsOfFile 而不是 imageNamed ，它没有采取适当的资源：尽管有屏幕类型，它仍为视网膜加载资源。

in this case actuall image path is returned, however it only works if I use imageWithContentsOfFile instead of imageNamed, and it doesn't take appropriate resource: it loads resource for retina despite the type of screen.

如果我省略filetype（就像我在添加 @ 2x 资源之前所做的那样，并且它工作正常，这是我尝试的第一件事并且确定它会起作用）

If I ommit filetype (as I did before adding @2x resources, and it worked ok, and was the first thing I tried and was sure it would work)

imageName = [NSString stringWithFormat: @"%@/%@",
                                  @"MyResourcesBundle.bundle"",
                                  @"someimage" ];

没有任何内容被加载。

添加.tiff扩展名与 pathForResource：具有相同的效果 - 加载视网膜资源，无视非视网膜屏幕的资源。

Adding ".tiff" extension have the same effect as pathForResource: - resource for retina is loaded, disregarding resource for non-retina screen.

那么我缺少什么？加载图像的正确方法是什么？

So what am I missing? What's the correct way of loading images?

推荐答案

您是否尝试使用以下方式加载图像：

Have you tried to simply load the image using:

UIImage * someImage = [UIImage imageNamed: @"someimage"];

（假设您的项目中有一个名为'someimage'的图像，例如someimage.png）

(assuming your have an image named 'someimage' in you project, for example someimage.png)

代码将自动选择视网膜/非视网膜版本，具体取决于平台。

The code will automatically pick retina/non-retina versions depending on the platform.

如果问题是那样的话创建TIFF，检查：

If the problem is that the TIFF are created, check:

在最新版本的XCode中，转到编辑器菜单，然后选择验证设置，这将删除该图稿组合。

In latest version of XCode, go to the Editor menu, then select "validate settings", which should remove that artwork combination.

这篇关于适用于iOS的图像资源的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！