限制UITextView的字数和字数监控，表情异常的情况和禁用表

3523FD80CC4350DE0AE7F89A8532B9A8.png

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;
}```