限制UITextView的字数和字数监控，表情异常的情况和禁用表情

限制UITextView的字数和字数监控，表情异常的情况和禁用表情

 

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因为字数占一个字符，表情占两个字符。你要是限制15个字符的话，全打表情的话，最后一个表情会出现错误，所以要使用监听,对UITextViewTextDidChangeNotification监听，想用的可以直接拿来用，废话不多说，直接上代码！！UITextfield也是一样，只不过把监听写为UITextfieldTextDidChangeNotification

//移除监听
-(void)dealloc{

    [[NSNotificationCenter  defaultCenter] removeObserver:self name:@"UITextViewTextDidChangeNotification" object:TtextView];

}
-(void)show{

    //输入详细

    TtextView = [[UITextView alloc]initWithFrame:CGRectMake(5*khScale, 5*khScale, self.view.frame.size.width-10*kScale, 160*khScale)];

    TtextView.backgroundColor = [UIColor whiteColor];
    TtextView.font = [UIFont systemFontOfSize:15*kScale];
    TtextView.tag = 301;

    TtextView.delegate = self;

    [self.view addSubview:TtextView];

     [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(textFiledEditChanged9:) name:@"UITextViewTextDidChangeNotification" object:TtextView];

NSInteger textlength9;

- (void)textFiledEditChanged9:(UITextView *)textView {

    NSString *toBeString = TtextView.text;

    //获取高亮部分
    UITextRange *selectedRange = [TtextView markedTextRange];
    UITextPosition *position = [TtextView positionFromPosition:selectedRange.start offset:0];

    // 没有高亮选择的字，则对已输入的文字进行字数统计和限制
    if (!position)
    {
        if (toBeString.length > 200 && TtextView.markedTextRange == nil)
        {
            //用字符串的字符编码指定索引查找位置
            NSRange rangeIndex = [toBeString rangeOfComposedCharacterSequenceAtIndex:200];
            if (rangeIndex.length == 1)
            {
                TtextView.text = [toBeString substringToIndex:200];
            }
            else
            {
                //用字符串的字符编码指定区域段查找位置
                //                NSRange rangeRange = [toBeString rangeOfComposedCharacterSequencesForRange:NSMakeRange(0, Max_Length)];
                TtextView.text = [toBeString substringWithRange:NSMakeRange(0, textlength9)];
            }
        } else {
            textlength9 = toBeString.length;
        }
    }
}

- (void)textViewDidChangeSelection:(UITextView *)textView{
    _textNumberLabel.text = [NSString stringWithFormat:@"%lu/200",(unsigned long)TtextView.text.length];
    if (TtextView.text.length >=200) {
        _textNumberLabel.textColor = [UIColor redColor];
    }
    else{
        _textNumberLabel.textColor = [UIColor colorWithRed:153.0/255.0 green:153.0/255.0 blue:153.0/255.0 alpha:1.0];
    }
    [self textChanged];
}

-(void)textChanged{

    CGRect orgRect = TtextView.frame;//获取原始UITextView的frame

    CGSize size = [TtextView sizeThatFits:CGSizeMake(TtextView.frame.size.width, MAXFLOAT)];

    orgRect.size.height=size.height+10;//获取自适应文本内容高度

    if (orgRect.size.height > 200) {
        noteTextHeight = orgRect.size.height;
    }
    [self updateViewsFrame];
}

- (void)updateViewsFrame{

    if (!allViewHeight) {
        allViewHeight = 0;
    }
    if (!noteTextHeight) {
        noteTextHeight = 100;
    }
}
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{

    _textNumberLabel.text = [NSString stringWithFormat:@"%lu/200   ",(unsigned long)TtextView.text.length];
    if (textView == TtextView) {
        //这里的if时候为了获取删除操作,如果没有次if会造成当达到字数限制后删除键也不能使用的后果.
        if (range.length == 1 && text.length == 0) {
            return YES;
        }
        //so easy
        else if (TtextView.text.length > 200) {
            TtextView.text = [TtextView.text substringToIndex:200];
            return NO;
        }
    }
    return YES;
}

-(void)textViewDidChange:(UITextView *)textView
{
    label.text = textView.text;
    if (textView.text.length == 0) {
        label.text = @"点击输入描述(200字以内)";
    }else{
        label.text = @"";
    }
}

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

    //   限制苹果系统输入法  禁止输入表情
    if ([[[UITextInputMode currentInputMode]primaryLanguage] isEqualToString:@"emoji"]) {
        return NO;
    }
    return YES;
}