给NSString 写个分类
@implementation NSString(EmojiExtension)
- (NSString*)removeEmoji {
__block NSMutableString* temp = [NSMutableString string];
[self enumerateSubstringsInRange: NSMakeRange(0, [self 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) {const unichar ls = [substring characterAtIndex: 1];
const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
[temp appendString: (0x1d000 <= uc && uc <= 0x1f77f)? @"": substring]; // U+1D000-1F77F
// non surrogate
} else {
[temp appendString: (0x2100 <= hs && hs <= 0x26ff)? @"": substring]; // U+2100-26FF
}
}];
return temp;
}
@end
