blocks|key|593479|text|NSString+*newString+=+[oldString+substringToIndex:[oldString+length]-1];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|593480|请始终参考documentation|unstyled|offset|length|593481|593482|substringToIndex:|unordered-list-item|style|CODE|593483|593484|593485|593486|要包含与案例相关的代码，请执行以下操作：|593487|NSString+*str+=+textField.text;
NSString+*truncatedString+=+[str+substringToIndex:[str+length]-1];|593488|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html|1|http://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html#//apple_ref/occ/instm/NSString/substringToIndex:|2|http://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html#//apple_ref/occ/instm/NSString/length^0|0|5|D|0|0|0|0|H|0|H|1|0|0|6|0|6|2|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|18|8|@]|9|@$G|19|H|1A|1|1B]]|A|$]]|$1|I|3|-4|5|F|7|1C|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|1D|8|@$G|1E|H|1F|M|N]]|9|@$G|1G|H|1H|1|1I]]|A|$]]|$1|O|3|H|5|L|7|1J|8|@$G|1K|H|1L|M|N]]|9|@$G|1M|H|1N|1|1O]]|A|$]]|$1|P|3|-4|5|F|7|1P|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|F|7|1Q|8|@]|9|@]|A|$]]|$1|R|3|S|5|F|7|1R|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|1S|8|@]|9|@]|A|$B|C]]|$1|V|3|-4|5|F|7|1T|8|@]|9|@]|A|$]]]|W|$X|$5|Y|Z|10|A|$11|12]]|13|$5|Y|Z|10|A|$11|14]]|15|$5|Y|Z|10|A|$11|16]]]]

<pre><code>NSString *newString = [oldString substringToIndex:[oldString length]-1];
</code></pre>

Always refer to the <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html" rel="noreferrer">documentation</a>:

<ul>
<li><a href="http://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html#//apple_ref/occ/instm/NSString/substringToIndex:" rel="noreferrer"><code>substringToIndex:</code></a></li>
<li><a href="http://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSString_Class/Reference/NSString.html#//apple_ref/occ/instm/NSString/length" rel="noreferrer"><code>length</code></a></li>
</ul>

<hr>

To include code relevant to your case:

<pre><code>NSString *str = textField.text;
NSString *truncatedString = [str substringToIndex:[str length]-1];
</code></pre>

blocks|key|2722103|text|试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2722104|s+=+[s+substringToIndex:[s+length]+-+1];|code-block|syntax|javascript|2722105|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this:

<pre><code>s = [s substringToIndex:[s length] - 1];
</code></pre>

blocks|key|591320|text|NSString+=+*string+=+@"abcdef";

string+=+[string+substringToIndex:string.length-(string.length>0)];|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|591321|如果有一个字符需要删除(即字符串的长度大于0)，(string.length>0)将返回1，从而使代码返回：|unstyled|offset|length|style|CODE|591322|+string+=+[string+substringToIndex:string.length-1];+|591323|如果没有要删除的字符(即字符串的长度不大于0)，则(string.length>0)返回0，从而使代码返回：|591324|string+=+[string+substringToIndex:string.length-0];+|591325|这可以防止崩溃。|591326|entityMap^0|0|O|H|0|0|P|H|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|V|8|@$G|W|H|X|I|J]]|9|@]|A|$]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$B|C]]|$1|M|3|N|5|F|7|Z|8|@$G|10|H|11|I|J]]|9|@]|A|$]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$B|C]]|$1|Q|3|R|5|F|7|13|8|@]|9|@]|A|$]]|$1|S|3|-4|5|F|7|14|8|@]|9|@]|A|$]]]|T|$]]

<pre><code>NSString = *string = @"abcdef";

string = [string substringToIndex:string.length-(string.length&gt;0)];
</code></pre>

If there is a character to delete (i.e. the length of the string is greater than 0) 
 <code>(string.length&gt;0)</code> returns 1, thus making the code return: 

<pre><code> string = [string substringToIndex:string.length-1]; 
</code></pre>

If there is NOT a character to delete (i.e. the length of the string is NOT greater than 0) 
 <code>(string.length&gt;0)</code> returns 0, thus making the code return: 

<pre><code>string = [string substringToIndex:string.length-0]; 
</code></pre>

which prevents crashes.

blocks|key|4620856|text|这段代码将只返回字符串的最后一个字符，而不会删除它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4620857|NSString+*newString+=+[oldString+substringToIndex:[oldString+length]-1];|code-block|syntax|javascript|4620858|您可以使用此命令来删除最后一个字符，并保留字符串的剩余值：|4620859|str+=+[str+substringWithRange:NSMakeRange(0,[str+length]+-+1)];|4620860|此外，对长度为0的的NSString使用substringToIndex也会导致崩溃。|offset|length|style|BOLD|4620861|您应该在执行此操作之前添加验证，如下所示：|4620862|if+([str+length]+>+0)+{

+++str+=+[str+substringToIndex:[s+length]+-+1];

}|4620863|这样，就可以安全地使用子字符串方法了。|4620864|注意:如果你的应用程序容易崩溃，苹果将拒绝你的应用程序。|4620865|entityMap^0|0|0|0|0|7|2|K|G|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|12|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|14|8|@$M|15|N|16|O|P]|$M|17|N|18|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|19|8|@]|9|@]|A|$]]|$1|S|3|T|5|D|7|1A|8|@]|9|@]|A|$E|F]]|$1|U|3|V|5|6|7|1B|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1C|8|@]|9|@]|A|$]]|$1|Y|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|Z|$]]

This code will just return the last character of the string and not removing it :

<pre><code>NSString *newString = [oldString substringToIndex:[oldString length]-1];
</code></pre>

you may use this instead to remove the last character and retain the remaining values of a string :

<pre><code>str = [str substringWithRange:NSMakeRange(0,[str length] - 1)];
</code></pre>

and also using substringToIndex to a NSString with 0 length will result to crashes.

you should add validation before doing so, like this :

<pre><code>if ([str length] &gt; 0) {

 str = [str substringToIndex:[s length] - 1];

}
</code></pre>

with this, it is safe to use substring method.

NOTE : Apple will reject your application if it is vulnerable to crashes.

blocks|key|2722232|text|简单且最佳的方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2722233|[mutableString+deleteCharactersInRange:NSMakeRange([myRequestString+length]-1,+1)];|code-block|syntax|javascript|2722234|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Simple and Best Approach

<pre><code>[mutableString deleteCharactersInRange:NSMakeRange([myRequestString length]-1, 1)];
</code></pre>

I've got some trouble 'ere trying to remove the last character of an NSString.
I'm kinda newbie in Objective-C and I have no idea how to make this work.

Could you guys light me up?

Remove last character of NSString

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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在尝试删除NSString的最后一个字符之前，我遇到了一些麻烦。我在Objective-C中有点新手，我不知道怎么做。你们能帮我点亮吗？

问删除NSString的最后一个字符
EN

回答 5

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