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UIWebView和编码的HTML字符串?

objective-c iphone

Mark Struzinski · 技术社区 · 16 年前

我在做一个iPhone项目。我从RSS提要中获取了一个HTML片段,并尝试使用loadHTMLString方法将其加载到UIWebView中。

我从feed接收的字符串是HTML编码的。当我把它传递给webview时,它会显示解码的HTML,这意味着它会显示标签和页面内容。

Objective-C中有没有一种方法可以在将HTML传递给UIWebView之前对其进行解码?

编辑:添加编码HTML的示例:

这是一篇很长的文章,但这里有一个片段:

&lt;li&gt;Wireless Data: Wi-Fi (802.11b/g), Nike + iPod support built in,  Maps location-based service, Bluetooth 2.1 + EDR&lt;/li&gt;
    &lt;li&gt;Audio Frequency Response:&amp;#160;20Hz to 20,000Hz&lt;/li&gt;
    &lt;li&gt;Audio Formats Supported: &lt;span&gt;AAC &lt;/span&gt;(16 to 320 Kbps), Protected &lt;span&gt;AAC  &lt;/span&gt;(from iTunes Store), &lt;span&gt;MP3 &lt;/span&gt;(16 to 320 Kbps), &lt;span&gt;MP3  VBR&lt;/span&gt;, Audible (formats 2, 3, and 4), Apple Lossless, &lt;span&gt;WAV&lt;/span&gt;,  and &lt;span&gt;AIFF&lt;/span&gt;&lt;/li&gt;
    &lt;li&gt;Photo Support: Syncs iPod-viewable photos in &lt;span&gt;JPEG&lt;/span&gt;,  BMP, &lt;span&gt;GIF&lt;/span&gt;, TIFF, &lt;span&gt;PSD &lt;/span&gt;(Mac only), and &lt;span&gt;PNG&lt;/span&gt;  formats&lt;/li&gt;
    &lt;li&gt;TV Out Support: 480p and 576p&lt;/li&gt;
    &lt;li&gt;Video Support: H.264 video, up to 1.5 Mbps, 640 by 480 pixels, 30  frames per second, Low-Complexity version of the H.264 Baseline Profile  with &lt;span&gt;AAC&lt;/span&gt;-LC audio up to 160 Kbps, 48kHz, stereo audio in  .m4v, .mp4, and .mov file formats; H.264 video, up to 2.5 Mbps, 640 by  480 pixels, 30 frames per second, Baseline Profile up to Level 3.0 with &lt;span&gt;AAC&lt;/span&gt;-LC  audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file  formats; &lt;span&gt;MPEG&lt;/span&gt;-4 video, up to 2.5 Mbps, 640 by 480 pixels,  30 frames per second, Simple Profile with &lt;span&gt;AAC&lt;/span&gt;-LC audio up  to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats&lt;/li&gt;
    &lt;li&gt;Environmental Requirements: Operating temperature: 32Â° to 95Â° F  (0Â° to 35Â° C); Nonoperating temperature: -4Â° to 113Â° F (-20Â° to 45Â° C), Relative  humidity: 5% to 95% noncondensing&lt;/li&gt;

2 回复 | 直到 16 年前

Don McCaughey 16 年前

快速而肮脏的方法是使用-stringByReplacingOccurrencesOfString:withString:要用等效字符替换编码的XML实体,请执行以下操作:

NSString *fragment = ...; // get fragment from RSS feed
[fragment autorelease]; // if not already autoreleased to prevent a memory leak

fragment = [fragment stringByReplacingOccurrencesOfString:@"&lt;" withString:@"<"];
// repeat for &gt; &amp; &quot; etc.

还有其他选择:在NSMutableString、正则表达式(ios4或RegexKitLite)上使用类似的方法,或者编写一个简单的解析器,但是如果您的HTML片段不是很大的话,这种方法可以很好地工作。

Dave DeLong 16 年前

类似于@Don的答案,但还有一些优化:

NSMutableString * html = [NSMutableString stringWithString:originalHTML];
NSDictionary * replacements = [NSDictionary dictionaryWithObjectsAndKeys:
                               @"<", @"&lt;",
                               @">", @"&gt;",
                               ....,
                               nil];
for (NSString * htmlEntity in replacements) {
  [html replaceOccurrencesOfString:htmlEntity withString:[replacements objectForKey:htmlEntity] options:0 range:NSMakeRange(0, [html length])];
}

谷歌也可以找到一些其他的选择 "cocoa decode html entity"