html - Objective-C中的hpp无法找到特定对象(XML/HTML解析器)

对于那些没试过的老兵来说，这太好了。它使用Xpath搜索HTML/XML文档。它完成了工作，对我这样的新手来说，这很容易理解。不过，我有麻烦了。
我有这段HTML：

    <ul class="challengesList dailyChallengesList">

<li>
<div class="corner topLeft"></div>
<img id="ctl00_mainContent_dailyChallengesRepeater_ctl00_challengeImage" title="Gunslinger" src="/images/reachstats/challenges/0.png" alt="Gunslinger" style="border-width:0px;">
<div class="info">
<div class="rFloat">
<p id="ctl00_mainContent_dailyChallengesRepeater_ctl00_challengeExpiration" class="timeDisplay dailyExpirationCountdown"><span>0d</span><span>19h</span><span>9m</span><span class="seconds">37s</span></p>
<p>1500cR</p>
</div>
<h5>Gunslinger</h5>
<p class="description">Kill 150 enemies in multiplayer Matchmaking.</p>
<div class="reward">

<div id="ctl00_mainContent_dailyChallengesRepeater_ctl00_progressBox" class="barContainer">
<div id="ctl00_mainContent_dailyChallengesRepeater_ctl00_progressBar" class="bar" style="width:21%;"><span></span></div>
<p>31/150</p>
</div>
</div>
</div>
<div class="clear"></div>
</li>

<li>
<div class="corner topLeft"></div>
<img id="ctl00_mainContent_dailyChallengesRepeater_ctl01_challengeImage" title="A Great Friend" src="/images/reachstats/challenges/0.png" alt="A Great Friend" style="border-width:0px;">
<div class="info">
<div class="rFloat">
<p id="ctl00_mainContent_dailyChallengesRepeater_ctl01_challengeExpiration" class="timeDisplay dailyExpirationCountdown"><span>0d</span><span>19h</span><span>9m</span><span class="seconds">37s</span></p>
<p>1400cR</p>
</div>
<h5>A Great Friend</h5>
<p class="description">Earn 15 assists today in multiplayer Matchmaking.</p>
<div class="reward">

<div id="ctl00_mainContent_dailyChallengesRepeater_ctl01_progressBox" class="barContainer">
<div id="ctl00_mainContent_dailyChallengesRepeater_ctl01_progressBar" class="bar" style="width:40%;"><span></span></div>
<p>6/15</p>
</div>
</div>
</div>
<div class="clear"></div>
</li>

<li>
<div class="corner topLeft"></div>
<img id="ctl00_mainContent_dailyChallengesRepeater_ctl02_challengeImage" title="Cannon Fodder" src="/images/reachstats/challenges/2.png" alt="Cannon Fodder" style="border-width:0px;">
<div class="info">
<div class="rFloat">
<p id="ctl00_mainContent_dailyChallengesRepeater_ctl02_challengeExpiration" class="timeDisplay dailyExpirationCountdown"><span>0d</span><span>19h</span><span>9m</span><span class="seconds">37s</span></p>
<p>1000cR</p>
</div>
<h5>Cannon Fodder</h5>
<p class="description">Kill 50 infantry-class foes in the Campaign today.</p>
<div class="reward">

<div id="ctl00_mainContent_dailyChallengesRepeater_ctl02_progressBox" class="barContainer">
<div id="ctl00_mainContent_dailyChallengesRepeater_ctl02_progressBar" class="bar" style="width:0%;"><span></span></div>
<p>0/50</p>
</div>
</div>
</div>
<div class="clear"></div>
</li>

<li>
<div class="corner topLeft"></div>
<img id="ctl00_mainContent_dailyChallengesRepeater_ctl03_challengeImage" title="Heroic Demon" src="/images/reachstats/challenges/3.png" alt="Heroic Demon" style="border-width:0px;">
<div class="info">
<div class="rFloat">
<p id="ctl00_mainContent_dailyChallengesRepeater_ctl03_challengeExpiration" class="timeDisplay dailyExpirationCountdown"><span>0d</span><span>19h</span><span>9m</span><span class="seconds">37s</span></p>
<p>1500cR</p>
</div>
<h5>Heroic Demon</h5>
<p class="description">Kill 30 Elites in Firefight Matchmaking on Heroic or harder.</p>
<div class="reward">

<div id="ctl00_mainContent_dailyChallengesRepeater_ctl03_progressBox" class="barContainer">
<div id="ctl00_mainContent_dailyChallengesRepeater_ctl03_progressBar" class="bar" style="width:0%;"><span></span></div>
<p>0/30</p>
</div>
</div>
</div>
<div class="clear"></div>
</li>

</ul>

最疯狂的是，我不能让人“看到”这个<div class="reward">。我用下面的方法找到它：

NSArray * rawProgress = [doc search:@"//ul[@class='challengesList']
                                          /li/div[@class='info']
                                                 /div[@class='reward']/p"];

它总是返回一个空数组。这让我发疯，因为同样的事情也适用于这个项目的所有其他元素。。。
如有任何帮助，将不胜感激：）
编辑
这是有效的：

NSArray * rawDescriptions = [doc search:@"//ul[@class='challengesList']
                                              /li/div[@class='info']
                                                     /p[@class='description']"];

这不是：

NSArray * rawProgress = [doc search:@"//ul[@class='challengesList']
                                          /li/div[@class='info']
                                                 /div[@class='reward']
                                                     /div[@id]//p"];

此外，尝试列出rFloat或reward的子节点会导致崩溃：(

最佳答案

您的“p”元素不是div class=“reward”的直接子元素。
使用您提供的XML，XPath表达式

div[@class='info']/div[@class='reward']//p

会有用的。