如何从Yahoo天气预报XML文档获取图像URL？

Blios 发表于 Dev

Blios

我从yahoo天气中获取天气信息，并且能够从文档中解析温度信息，但在从<escription>元素中获取图像网址时遇到问题，即

<description>
<![CDATA[
<img src="http://l.yimg.com/a/i/us/we/52/28.gif"/><br /> <b>Current Conditions:</b><br /> Mostly Cloudy, 61 F<BR /> <BR /><b>Forecast:</b><BR /> Thu - Showers. High: 66 Low: 48<br /> Fri - AM Light Rain. High: 52 Low: 37<br /> Sat - Partly Cloudy. High: 61 Low: 47<br /> Sun - AM Clouds/PM Sun. High
]]>
<![CDATA[
: 66 Low: 48<br /> Mon - PM Showers. High: 62 Low: 50<br /> <br /> <a href="http://us.rd.yahoo.com/dailynews/rss/weather/Hakuba_Station__JP/*http://weather.yahoo.com/forecast/JAXX0105_f.html">Full Forecast at Yahoo! Weather</a><BR/><BR/> (provided by <a href="http://www.weather.com" >The Weather Channel</a>)<br/>
]]>
</description>

请不要说我是NSXMLParser用来解析MXL文档的。

Blios

基于@ haras.prasad的答案，我使用NSXMLParser委托解决了这个问题，NSRegularExpression

- (void)parser:(NSXMLParser *)parser foundCDATA:(NSData *)CDATABlock {
    NSString *cdataString = [[NSString alloc] initWithData:CDATABlock encoding:NSUTF8StringEncoding];
    // Do extraction of image src here
    NSError* error;
    NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(<img\\s[\\s\\S]*?src\\s*?=\\s*?['\"](.*?)['\"][\\s\\S]*?>)+?"
                                                                           options:NSRegularExpressionCaseInsensitive
                                                                             error:&error];

    NSString *imageUrlString = nil;
    NSTextCheckingResult *match = [regex firstMatchInString:cdataString options:0 range:NSMakeRange(0, [cdataString length])];
    if (match)
    {
        imageUrlString = [cdataString substringWithRange:[match rangeAtIndex:2]];

        self.iconUrl = imageUrlString;
    }

}

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