iPhone Dev：UIWebView baseUrl到Documents文件夹中的资源而不是App bundle [英] iPhone Dev: UIWebView baseUrl to resources in Documents folder not App bundle

问题描述

问候！任何人都可以请我帮忙找到解决方法：

• 使用<将加载到 UIWebView 中em> loadHTMLString 并包含（使用 baseURL ）资源，例如CSS，来自用户 Documents 目录中文件夹的图像文件 - 以及不来自应用程序的MainBundle 。

我见过有关如何在应用程序包/ MainBundle中加载baseURL的教程，这很简单，但没有来自iPhone的资源文件目录。

我的文件夹的结构如下：

  dirX 
 | ---> file.xml 
 | ---> dirCSS 
 | ---> style.css 
  

我可以检索dir X的完整路径（Users / ..... ../dir X）。但是，将该路径传递给UIWebView的baseURL时，

  [webView loadHTMLString：fileXMLString baseURL：pathToDirX] 
  

... webView无法识别资源（例如dirCSS中的style.css）作为fileXMLString中的href'

 < link href =dirCSS / style.css =stylesheet/> 
  

所以目前我的应用程序可以成功加载html字符串但不加载样式表作为链接到html字符串中的CSS是 relative - 例如。 css / style.css

非常感谢任何帮助：）

解决方案

经过一些谷歌搜索后，我终于找到了一个适合我提出的问题的解决方案。希望这可以帮助那些面临同样问题的人。

诀窍是为UIWebView的baseURL创建NSURL对象时格式化字符串路径。虽然在大多数情况下我通常使用典型的Users /...../dir / file，但使用UIWebView的loadHTMLString：baseURL加载需要一种不同的方法。

如 http://dblog.com.au/iphone-development/loading-local-files-into-uiwebview/ ，我得到了解决方案，资源的字符串路径只需要斜杠到用％s替换为双斜杠和空格：

  NSString * imagePath = [[NSBundle mainBundle] resourcePath]; 
 imagePath = [imagePath stringByReplacingOccurrencesOfString：@/withString：@//]; 
 imagePath = [imagePath stringByReplacingOccurrencesOfString：@withString：@％20]; 
 
 NSString * HTMLData = @
< h1>你好，这是一个测试< / h1> 
< img src =sample.jpgalt =width =100height =100/>; 
 [webView loadHTMLString：HTMLData baseURL：
 [NSURL URLWithString：
 [NSString stringWithFormat：@file：/% @ //，imagePath] 
]]; 
  

请注意替换字符串以及：

  [NSString stringWithFormat：@file：/% @ //，imagePath] 
  

虽然上面的示例代码是检索应用程序的mainBundle的路径，但它也可以在其他文件夹中工作，即Documents（及其子文件夹），就像我在我的文件中一样。 / p>

亲切的问候，
oonoo

PS再次感谢Nic回复：）

Greetings! Can anyone please kindly assist me finding a way around the following:

• load an html into a UIWebView using loadHTMLString and include(using baseURL) the resources such as the CSS, image files from folders within user's Documents directory - and not from the MainBundle of the application.

I have seen tutorials on how to use baseURL to load within the application bundle/MainBundle which is straightforward but not with resources from the iPhone's Documents directories.

The structure of my documents folder is as follows:

dirX 
|---> file.xml 
|---> dirCSS 
      |---> style.css

I can retrieve the full path to the dir X(Users/......./dir X). However, when passing that path to the UIWebView's baseURL such that

[webView loadHTMLString:fileXMLString baseURL:pathToDirX]

... webView does not recognize the resources(eg style.css within dirCSS) as href'ed within the fileXMLString

<link href="dirCSS/style.css" rel="stylesheet" />

So currently my application can successfully load the html string but does not load the stylesheet as the link to the CSS within the html string are relative - eg. css/style.css

Any help is very much appreciated :)

解决方案

After some googling I have finally found a fitting solution for the question I posed. Hopefully this would help those who face the same problem.

The trick is with the formatting of the string path when creating an NSURL object for baseURL of a UIWebView. Although usually I use the typical "Users/...../dir/file" in most cases, loading using UIWebView's loadHTMLString:baseURL needs a different approach.

As described in http://dblog.com.au/iphone-development/loading-local-files-into-uiwebview/, where I got the solution, string path to the resources just needs to have slashes to be replaced with double-slashes and spaces with %20:

NSString *imagePath = [[NSBundle mainBundle] resourcePath];
imagePath = [imagePath stringByReplacingOccurrencesOfString:@"/" withString:@"//"];
imagePath = [imagePath stringByReplacingOccurrencesOfString:@" " withString:@"%20"];

NSString *HTMLData = @"
<h1>Hello this is a test</h1>
<img src="sample.jpg" alt="" width="100" height="100" />";
[webView loadHTMLString:HTMLData baseURL:
           [NSURL URLWithString: 
           [NSString stringWithFormat:@"file:/%@//",imagePath]
           ]];

Do take note of the replacing of the strings and also the:

[NSString stringWithFormat:@"file:/%@//",imagePath]

Although the example code above is retrieving the path to the mainBundle of the application, it can also work in other folders, ie Documents(and its subfolders) as I did in mine.

Kind regards, oonoo

PS Thanks again Nic for the reply :)

这篇关于iPhone Dev：UIWebView baseUrl到Documents文件夹中的资源而不是App bundle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！