iOS中Emoji表情的判断

问题

服务器端不支持Emoji表情，因此客户端在上传用户输入时，不能包含Emoji表情。

解决方案

在客户端发送请求前，判断用户输入中是否含有表情，如果含有表情，则提示用户重新输入。这个过程关键是如何判断字符串中是否含有Emoji表情。要判断是否含有Emoji表情，必须先了解什么是Emoji。

Emoji 是一套起源于日本的12x12像素表情符号，由栗田穣崇(Shigetaka Kurit)创作，最早在日本网络及手机用户中流行，自苹果公司发布的iOS 5输入法中加入了emoji后，这种表情符号开始席卷全球，目前emoji已被大多数现代计算机系统所兼容的Unicode编码采纳，普遍应用于各种手机短信和社交网络中。

以上是摘自百度百科里的一段话，Emoji表情最终会被编码成Unicode，因此，只要知道Emoji表情的Unicode编码的范围，就可以判断用户是否输入了Emoji表情。以下是具体代码，我这里写成了NSString的一个分类

<code class="hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@implementation</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">NSString</span> (<span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">Emoji</span>)</span>+ (<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">BOOL</span>)stringContainsEmoji:(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span> *)string{    __block <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">BOOL</span> returnValue = <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">NO</span>;    [string enumerateSubstringsInRange:NSMakeRange(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>, [string length])     options:NSStringEnumerationByComposedCharacterSequences     usingBlock:^(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span> *substring, <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSRange</span> substringRange, <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSRange</span> enclosingRange, <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">BOOL</span> *stop) {        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">const</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">unichar</span> hs = [substring characterAtIndex:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>];        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0xd800</span> <= hs && hs <= <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0xdbff</span>) {            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (substring<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.length</span> > <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>) {                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">const</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">unichar</span> ls = [substring characterAtIndex:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>];                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">const</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> uc = ((hs - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0xd800</span>) * <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x400</span>) + (ls - <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0xdc00</span>) + <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x10000</span>;                <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x1d000</span> <= uc && uc <= <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x1f77f</span>) {                    returnValue = <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">YES</span>;                }            }        } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (substring<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.length</span> > <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>) {            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">const</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">unichar</span> ls = [substring characterAtIndex:<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>];            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (ls == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x20e3</span>) {                returnValue = <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">YES</span>;            }        } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> {            <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x2100</span> <= hs && hs <= <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x27ff</span>) {                returnValue = <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">YES</span>;            } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x2B05</span> <= hs && hs <= <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x2b07</span>) {                returnValue = <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">YES</span>;            } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x2934</span> <= hs && hs <= <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x2935</span>) {                returnValue = <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">YES</span>;            } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x3297</span> <= hs && hs <= <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x3299</span>) {                returnValue = <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">YES</span>;            } <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span> <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (hs == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0xa9</span> || hs == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0xae</span> || hs == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x303d</span> || hs == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x3030</span> || hs == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x2b55</span> || hs == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x2b1c</span> || hs == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x2b1b</span> || hs == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0x2b50</span>) {                returnValue = <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">YES</span>;            }        }    }];    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> returnValue;}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li></ul>

这段代码并非本人原创，也是取自互联网，经测试好使，分享给大家。

顶

4