Finding emojis in NSStrings

Emojis.m

// This is bad and I feel bad. Suggestions for improvements on finding Emoji?
// This current solution is acceptable for us right now, but obviously the less I have to exclude the better.

@interface NSString (Emoji)

/**
 Returns if the receiver may contain Emoji characters.
 
 @note This method may have false-positives since it sees if the string has non-ASCII characters. If the receiver has a non-Emoji, non-ASCII character (like é) then it will still return YES.
*/
- (BOOL)maybeContainsEmoji;

@end


@implementation NSString (Emoji)

- (BOOL)maybeContainsEmoji
{
	NSData *stringData = [self dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
	return ![[[NSString alloc] initWithData:stringData encoding:NSASCIIStringEncoding] isEqualToString:self];
}

@end

Thanks 😄