NSString *lang = [self.inputTextField.textInputMode primaryLanguage]; // 键盘输入模式

    if ([lang isEqualToString:@"zh-Hans"])

    { // 简体中文输入，包括简体拼音，健体五笔，简体手写

        UITextRange *selectedRange = [self.inputTextField markedTextRange];       //获取高亮部分

        //获取已经确认的文字的长度

        NSInteger confirmedlength =  [self.inputTextField offsetFromPosition:self.inputTextField.beginningOfDocument

                                                                  toPosition:selectedRange.start];

        if ((nil == selectedRange) || selectedRange.isEmpty)

        {

            confirmedlength = self.inputTextField.text.length;

        }

        //截断超过长度的部分

        BOOL bCuttedOff = NO;

        //处理一个字符长度超过多个的情况

        if (confirmedlength >= 15)

        {

            NSRange rangeRange = [self.inputTextField.text rangeOfComposedCharacterSequencesForRange:NSMakeRange(0, 15)];

            if (self.inputTextField.text.length > rangeRange.length)

            {

                bCuttedOff = YES;

                self.inputTextField.text = [self.inputTextField.text substringSafeWithRange:rangeRange];

            }

        }

        if (YES == bCuttedOff)

        {

//太长了

        }

        return;

    }

    else

    {

        BOOL bCuttedOff = NO;

        if (self.inputTextField.text.length > 15)

        {

            //处理一个字符长度超过多个的情况

            NSRange rangeRange = [self.inputTextField.text rangeOfComposedCharacterSequencesForRange:NSMakeRange(0, 15)];

            if (self.inputTextField.text.length > rangeRange.length)

            {

                bCuttedOff = YES;

                self.inputTextField.text = [self.inputTextField.text substringSafeWithRange:rangeRange];

            }

        }

        if (YES == bCuttedOff)

        {

//太长了

        }

        return ;

    }