以下是我整理的网络上的两种方法、希望帮助到正在寻找此方法的你们

---我只是代码的搬运工

使用的时候最好写在分类里面，方便调用

方法一：（建议使用）

  + (BOOL)stringContainsEmoji:(NSString *)string
{
NSUInteger len = [string lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
if (len < 3) { // 大于2个字符需要验证Emoji(有些Emoji仅三个字符)
    return NO;
}

// 仅考虑字节长度为3的字符,大于此范围的全部做Emoji处理
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];

Byte *bts = (Byte *)[data bytes];
Byte bt;
short v;
for (NSUInteger i = 0; i < len; i++) {
    bt = bts[i];
    
    if ((bt | 0x7F) == 0x7F) { // 0xxxxxxx ASIIC编码
        continue;
    }
    if ((bt | 0x1F) == 0xDF) { // 110xxxxx 两个字节的字符
        i += 1;
        continue;
    }
    if ((bt | 0x0F) == 0xEF) { // 1110xxxx 三个字节的字符(重点过滤项目)
        // 计算Unicode下标
        v = bt & 0x0F;
        v = v << 6;
        v |= bts[i + 1] & 0x3F;
        v = v << 6;
        v |= bts[i + 2] & 0x3F;
        
        // NSLog(@"%02X%02X", (Byte)(v >> 8), (Byte)(v & 0xFF));
        
        if ([NSString emojiInSoftBankUnicode:v] || [NSString emojiInUnicode:v]) {
            return YES;
        }
        
        i += 2;
        continue;
    }
    if ((bt | 0x3F) == 0xBF) { // 10xxxxxx 10开头,为数据字节,直接过滤
        continue;
    }
    
    return YES; // 不是以上情况的字符全部超过三个字节,做Emoji处理
}
return NO;
}

+ (BOOL)emojiInSoftBankUnicode:(short)code
{
return ((code >> 8) >= 0xE0 && (code >> 8) <= 0xE5 && (Byte)(code & 0xFF) < 0x60);
}
+ (BOOL)emojiInUnicode:(short)code
{
if (code == 0x0023
    || code == 0x002A
    || (code >= 0x0030 && code <= 0x0039)
    || code == 0x00A9
    || code == 0x00AE
    || code == 0x203C
    || code == 0x2049
    || code == 0x2122
    || code == 0x2139
    || (code >= 0x2194 && code <= 0x2199)
    || code == 0x21A9 || code == 0x21AA
    || code == 0x231A || code == 0x231B
    || code == 0x2328
    || code == 0x23CF
    || (code >= 0x23E9 && code <= 0x23F3)
    || (code >= 0x23F8 && code <= 0x23FA)
    || code == 0x24C2
    || code == 0x25AA || code == 0x25AB
    || code == 0x25B6
    || code == 0x25C0
    || (code >= 0x25FB && code <= 0x25FE)
    || (code >= 0x2600 && code <= 0x2604)
    || code == 0x260E
    || code == 0x2611
    || code == 0x2614 || code == 0x2615
    || code == 0x2618
    || code == 0x261D
    || code == 0x2620
    || code == 0x2622 || code == 0x2623
    || code == 0x2626
    || code == 0x262A
    || code == 0x262E || code == 0x262F
    || (code >= 0x2638 && code <= 0x263A)
    || (code >= 0x2648 && code <= 0x2653)
    || code == 0x2660
    || code == 0x2663
    || code == 0x2665 || code == 0x2666
    || code == 0x2668
    || code == 0x267B
    || code == 0x267F
    || (code >= 0x2692 && code <= 0x2694)
    || code == 0x2696 || code == 0x2697
    || code == 0x2699
    || code == 0x269B || code == 0x269C
    || code == 0x26A0 || code == 0x26A1
    || code == 0x26AA || code == 0x26AB
    || code == 0x26B0 || code == 0x26B1
    || code == 0x26BD || code == 0x26BE
    || code == 0x26C4 || code == 0x26C5
    || code == 0x26C8
    || code == 0x26CE
    || code == 0x26CF
    || code == 0x26D1
    || code == 0x26D3 || code == 0x26D4
    || code == 0x26E9 || code == 0x26EA
    || (code >= 0x26F0 && code <= 0x26F5)
    || (code >= 0x26F7 && code <= 0x26FA)
    || code == 0x26FD
    || code == 0x2702
    || code == 0x2705
    || (code >= 0x2708 && code <= 0x270D)
    || code == 0x270F
    || code == 0x2712
    || code == 0x2714
    || code == 0x2716
    || code == 0x271D
    || code == 0x2721
    || code == 0x2728
    || code == 0x2733 || code == 0x2734
    || code == 0x2744
    || code == 0x2747
    || code == 0x274C
    || code == 0x274E
    || (code >= 0x2753 && code <= 0x2755)
    || code == 0x2757
    || code == 0x2763 || code == 0x2764
    || (code >= 0x2795 && code <= 0x2797)
    || code == 0x27A1
    || code == 0x27B0
    || code == 0x27BF
    || code == 0x2934 || code == 0x2935
    || (code >= 0x2B05 && code <= 0x2B07)
    || code == 0x2B1B || code == 0x2B1C
    || code == 0x2B50
    || code == 0x2B55
    || code == 0x3030
    || code == 0x303D
    || code == 0x3297
    || code == 0x3299
    // 第二段
    || code == 0x23F0) {
    return YES;
}
return NO;
}

方法二：

此方法有的表情检测不出来
+ (BOOL)stringContainsEmoji:(NSString *)string
{
// 过滤所有表情。returnValue为NO表示不含有表情，YES表示含有表情
__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;
}