iOS开发 - 判断字符串是否包含有Emoij表情

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。下面是摘自网络上大神写的一段代码给大家分享下。

判断是否包含Emoji表情：

+ (BOOL)stringContainsEmoji:(NSString *)string
{    
    __block BOOL returnValue = NO;    
    [string enumerateSubstringsInRange:NSMakeRange(0, [string length]) 
options:NSStringEnumerationByComposedCharacterSequences usingBlock:
^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) { 
        const unichar hs = [substring characterAtIndex:0]; 
        // surrogate pair        
        if (0xd800 <= hs && hs <= 0xdbff) {        
                if (substring.length > 1) {         
                        const unichar ls = [substring characterAtIndex:1];        
                        const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;              
                        if (0x1d000 <= uc && uc <= 0x1f77f) {         
                             returnValue = YES;                 
                        }             
                 }        
            } else if (substring.length > 1) {
                 const unichar ls = [substring characterAtIndex:1];
                 if (ls == 0x20e3) {
                       returnValue = YES;            
                 }                    
             } else {      
                  // non surrogate     
                  if (0x2100 <= hs && hs <= 0x27ff) {          
                        returnValue = YES;          
                   } else if (0x2B05 <= hs && hs <= 0x2b07) {     
                        returnValue = YES;         
                  } else if (0x2934 <= hs && hs <= 0x2935) {         
                        returnValue = YES;       
                  } else if (0x3297 <= hs && hs <= 0x3299) { 
                        returnValue = YES;          
                  } else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50) {      
                        returnValue = YES;          
             }        
         }
    }];
    return returnValue;
}

过滤Emoji表情方法，可结合上面的方法进行使用：

- (NSString *)converStrEmoji:(NSString *)emojiStr
{
   __block NSString *muStr = [[NSString alloc]initWithString:emojiStr];
    [emojiStr enumerateSubstringsInRange:NSMakeRange(0, emojiStr.length) options:NSStringEnumerationByComposedCharacterSequences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
    if ([self stringContainsEmoji:substring]) {
        muStr = [muStr stringByReplacingOccurrencesOfString:substring withString:@""];
    }
    }];
    return muStr;
}