无法从资产目录中存储的文件中获取数据
[英]Can't get data from file stored in asset catalog
问题描述
I am storing several .svg files in an asset catalog.
我在资产目录中存储了几个 .svg 文件。 To retrieve an asset I use the following code:要检索资产，我使用以下代码：
NSDataAsset *asset = [[NSDataAsset alloc] initWithName:@"p"];
When running this code I get the following log message:运行此代码时，我收到以下日志消息：
CoreUI: attempting to lookup a named data 'p' with a type that is not a data type in the AssertCatalog
The name of the file is 'p.svg' which is stored in a folder with 'dataset' as extension.该文件的名称是“p.svg”，它存储在一个以“dataset”为扩展名的文件夹中。 I tried using other extensions for the file but nothing works.我尝试为文件使用其他扩展名，但没有任何效果。 I always get the same error and the asset is nil.我总是得到同样的错误，资产为零。
3 个解决方案
解决方案1
1 2016-02-11 00:24:15
This may be related to a problem I'm having, in that the UTI I'm identifying my assets as being could run up the UTI dependancies and find public.image , thus making CoreUI think the asset is an image type and not a data type.这可能与我遇到的一个问题有关，因为我确定我的资产的 UTI 可以运行 UTI 依赖项并找到public.image ，从而使 CoreUI 认为资产是图像类型而不是数据类型。
SVGs inherit from public.image , so you will need to set the File Type to something that doesn't inherit from public.image . public.image继承自public.image ，因此您需要将文件类型设置为不继承自public.image 。 Having it be just public.data will suffice.让它只是public.data就足够了。
解决方案2
0 2015-10-02 11:03:44
Just reference the svg or whatever file in your project like .h/.m:只需引用 svg 或项目中的任何文件，如 .h/.m：
NSString *path = [[NSBundle mainBundle] pathForResource:@"p" ofType:@"svg"];
[NSData dataWithContentsOfFile:path];
If path is nil, try:如果路径为零，请尝试：
In the Xcode target "Build Phases" add the file under "Copy Bundle Resources"".
解决方案3
0 2020-10-22 12:22:31
I also have this issue;我也有这个问题； I wanted to provide images etc from local assets store.我想从本地资产商店提供图像等。 Dragging the files into the catalog I would fetch them like so - here a String:将文件拖到目录中我会像这样获取它们 - 这里是一个字符串：
extension NSString {
class func string(fromAsset: String) -> String {
guard let asset = NSDataAsset.init(name: fromAsset) else {
return String(format: "Unable to locate asset:\n%@", fromAsset)
}
let data = NSData.init(data: (asset.data))
let text = String.init(data: data as Data, encoding: String.Encoding.utf8)
if fromAsset.hasSuffix(".md"), let html = try? Down(markdownString: text!).toHTML()
{
let htmlDoc = String(format: "<html><body>%@</body></html>", html)
let data = Data(htmlDoc.utf8)
if let attrs = try? NSAttributedString(data: data, options: [.documentType: NSAttributedString.DocumentType.html], documentAttributes: nil) {
return attrs.string
}
}
return text!
}
}
the premise is they have to exist.前提是它们必须存在。 I think a per type / class extension would make retrieval simple.我认为每个类型/类扩展将使检索变得简单。 Eventually a generic object extension could dispatch to the proper extension, as here, you'd have to know what it was, so the decision which to use is currently a manual one.最终，通用对象扩展可以分派到适当的扩展，因为在这里，您必须知道它是什么，因此使用哪个决定目前是手动的。
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