iOS 判断字符串中有没有emoj

+(BOOL)stringContainEmoji:(NSString *)str{

__block BOOL returnValue = NO;

[str enumerateSubstringsInRange:NSMakeRange(0, [str length])

options:NSStringEnumerationByComposedCharacterSequences

usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {

const unichar high = [substring characterAtIndex: 0];

// Surrogate pair (U+1D000-1F9FF)

if (0xD800 <= high && high <= 0xDBFF) {

const unichar low = [substring characterAtIndex: 1];

const int codepoint = ((high - 0xD800) * 0x400) + (low - 0xDC00) + 0x10000;

if (0x1D000 <= codepoint && codepoint <= 0x1F9FF){

returnValue = YES;

}

// Not surrogate pair (U+2100-27BF)

} else {

if (0x2100 <= high && high <= 0x27BF){

returnValue = YES;

}

}

}];

return returnValue;

}