Korean-aware character length limiting

gistfile1.m

- (void)textViewDidChange:(UITextView *)inTextView {
    NSUInteger count = [[self text] length];
    __weak __typeof__(self) blockSelf = self;
    
    if (count > self.characterLimit) {
        NSMutableString *newString = [NSMutableString string];
        __block NSUInteger blockCount = 0;

        [inTextView.text enumerateSubstringsInRange:NSMakeRange(0, [inTextView.text length])
                                            options:NSStringEnumerationByComposedCharacterSequences
                                         usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop){
                                             [newString appendString:substring];
                                             blockCount++;

                                             if (blockCount == blockSelf.characterLimit) {
                                                 *stop = YES;
                                             }

                                         }];

        inTextView.text = newString;
    }
}