iOS开发 判断字符串是不是表情

+ (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];

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 {

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;

}