论坛 › 知识问答 › iphone - 查找由字符串分隔的 NSString 内的范围

菜鸟教程小白 发表于 2022-12-13 13:33:31

iphone - 查找由字符串分隔的 NSString 内的范围

                                            <p><p>虽然 iOS 提供了很多有用的字符串方法，但我找不到一个好的解决方案来获取由给定字符分隔的字符串范围。</p>

<p><strong>原字符串:</strong> </p>

<blockquote>
<p>|You| will |achieve| everything you |want| if you |work| hard</p>
</blockquote>

<p>分隔符是<code>|</code>。</p>

<p>单独的字符串1:你(范围:3、3)</p>

<p>单独的string2:实现(范围:12、7)</p>

<p>单独的字符串3:想要(范围:37、4)</p>

<p>单独的字符串4:工作(范围:51、4)</p>

<p>NSString 方法的 <code>substringFromIndex:</code> 使得使用 NSString 找到这些范围成为可能，但这似乎效率低下。</p>

<p>请告诉我解决此问题的更好方法。</p></p>
                                    <br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
                                            <p><p>您应该使用 <a href="https://developer.apple.com/library/mac/#documentation/Foundation/Reference/NSRegularExpression_Class/Reference/Reference.html" rel="noreferrer noopener nofollow">NSRegularExpression</a>的<a href="https://developer.apple.com/library/mac/documentation/Foundation/Reference/NSRegularExpression_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40009708-CH1-SW6" rel="noreferrer noopener nofollow">matchesInString:options:range:</a>方法。</p>

<blockquote>
<p><strong>Return Value</strong> </p>

<p>An array of <a href="https://developer.apple.com/library/mac/#documentation/AppKit/Reference/NSTextCheckingResult_Class/Reference/Reference.html" rel="noreferrer noopener nofollow">NSTextCheckingResult</a> objects. Each result
<strong>gives the overall matched range</strong> via its range property, and the range
of each individual capture group via its rangeAtIndex: method. The
range {NSNotFound, 0} is returned if one of the capture groups did not
participate in this particular match.</p>
</blockquote>

<p>你可能有这样的代码:</p>

<pre><code>NSString *str = @&#34;|You| will |achieve| everything you |want| if you |work| hard&#34;;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:
    @&#34;[^|]*&#34; options: 0 error:nil];
NSArray *results = [regex matchesInString:str
                                  options:0
                                    range:NSMakeRange(0, )];
// ... do interesting code on results...
// Note that you should iterate through the array and use the &#39;range&#39; property
// to get the range.

for (NSTextCheckingResult *textResult in results)
{
   if (textResult.range.length &gt; 0)
   {
      NSString *substring = ;
      NSLog(@&#34;string at range %@ :: \&#34;%@\&#34;&#34;,
            NSStringFromRange(textResult.range),
            substring);
   }
}
</code></pre>

<p>日志:</p>

<blockquote>
<p>string at range {1, 3} :: &#34;You&#34;</p>

<p>string at range {5, 6} :: &#34; will &#34;</p>

<p>string at range {12, 7} :: &#34;achieve&#34;</p>

<p>string at range {20, 16} :: &#34; everything you &#34;</p>

<p>string at range {37, 4} :: &#34;want&#34;</p>

<p>string at range {42, 8} :: &#34; if you &#34;</p>

<p>string at range {51, 4} :: &#34;work&#34;</p>

<p>string at range {56, 5} :: &#34; hard&#34;</p>
</blockquote></p>
                                   
                                                <p style="font-size: 20px;">关于iphone - 查找由字符串分隔的 NSString 内的范围，我们在Stack Overflow上找到一个类似的问题：
                                                        <a href="https://stackoverflow.com/questions/10385196/" rel="noreferrer noopener nofollow" style="color: red;">
                                                                https://stackoverflow.com/questions/10385196/
                                                        </a>
                                                </p>
                                       

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