对textView 的输入个数进行判断

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text

{

    /*

    if ([text isEqualToString:@" "])

    {

        [textView resignFirstResponder]; return NO;

    }else if([textView.text length] >= 30 && ![text isEqualToString:@""]){

        return NO;

    }

     

    return YES;

     */

//    return YES;

    int _textMaxLength = 60;

    if (_textMaxLength == 0) {

        return YES;

    }

     

    void(^dealWithTexts)(void) = ^() {

        NSString *textInField = [textView.text substringToIndex:range.location];

        int inputedHanzi = [[textInField componentsMatchedByRegex:@"[u4e00-u9fa5]"] count];

        int inputedLength = textInField.length + inputedHanzi;

        int allowedLength = _textMaxLength - inputedLength;

        int length = 0;

        int stop = text.length;

        for (int i = 0; i < text.length; i++) {

            NSString *c = [text substringWithRange:NSMakeRange(i, 1)];

            if ([c isMatchedByRegex:@"[u4e00-u9fa5]"]) {

                if (length + 2 > allowedLength) { stop = i; break; }

                length += 2;

            } else {

                if (length + 1 > allowedLength) { stop = i; break; }

                length++;

            }

        }

        NSString *shouldAddedString = [text substringToIndex:stop];

        NSString *textShouldInField = [NSString stringWithFormat:@"%@%@",textInField,shouldAddedString];

        [textView performSelector:@selector(setText:) withObject:textShouldInField afterDelay:0.0];

    };

     

    if ( 1 == range.length && text.length == 0)

 {

  return YES; //删除

 }

    else if (range.length > 1) {

        dealWithTexts();

        return YES;

    }

 else

 {

  NSString * text2 = [textView.text stringByReplacingCharactersInRange:range withString:text];

        text2 = [text2 stringByReplacingOccurrencesOfRegex:@"[u4e00-u9fa5]" withString:@"##"];

        int symbol = [[text2 componentsMatchedByRegex:@"u2006"] count];

  if ( _textMaxLength > 0 && text2.length - symbol > _textMaxLength )

  {

            if (text.length > 1) {

                dealWithTexts();

                return YES;

            }

   return NO;

  }

  return YES;

 }

}