- (BOOL)stringContainsEmoji:(NSString *)string
{
__block BOOL returnValue = NO;
[string enumerateSubstringsInRange:NSMakeRange(0, [string length])
options:NSStringEnumerationByComposedCharacterSequences
usingBlock:^(NSString * _Nullable substring, NSRange substringRange, NSRange enclosingRange, BOOL * _Nonnull 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 <= 0x1f918)
{
returnValue = YES;
}
}
}
else if (substring.length > 1)
{
const unichar ls = [substring characterAtIndex:1];
if (ls == 0x20e3 || ls == 0xFE0F || ls == 0xd83c)
{
returnValue = YES;
}
}
else
{
// non surrogate
if (0x2100 <= hs && hs <= 0x27ff)
{
if (0x278b <= hs && 0x2792 >= hs)
{
returnValue = NO;
}
else
{
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 || hs == 0xd83e)
{
returnValue = YES;
}
}
}];
return returnValue;
}
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