UitextView的动态调整

根据字体和设定宽度计算高度

//自适应字体
- (CGSize)sizeWithString:(NSString*)string font:(UIFont*)font width:(float)width {
    CGRect rect = [string boundingRectWithSize:CGSizeMake(width,80000) options:NSStringDrawingTruncatesLastVisibleLine|NSStringDrawingUsesFontLeading|NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:font} context:nil];
    return rect.size;
}

限制高度截取内容

//获取字体高度
- (CGFloat)getTextHeight:(NSString*)string{
    CGSize size = CGSizeMake(PKScreenW - 32 - 10, MAXFLOAT);
    CGFloat height;
    if (string == nil) {
        height = [@"高" boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingTruncatesLastVisibleLine attributes:@{NSFontAttributeName : [UIFont systemFontOfSize:14]} context:nil].size.height;
    }
    else
    {
        height = [string boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingTruncatesLastVisibleLine attributes:@{NSFontAttributeName : [UIFont systemFontOfSize:14]} context:nil].size.height;
    }
    return height;
}

//获取指定高度所含字符内容
- (NSString*)getTextWithHeight:(CGFloat)heigth andString:(NSString*) str{
    //NSString *str = self.textView.text;
    NSInteger i = 0 ;
    for (; i< str.length; i++) {
        NSString * test = [str substringToIndex:i];
        CGFloat h = [self getTextHeight:test];
        if (h > heigth) {
            break;
        }
    }
    PKLog(@"%@",[str substringToIndex:i-1]);
    return [str substringToIndex:i-1];
}

动态计算高度和限制行数 并判断字符类型

#pragma mark - UItextViewDelegate代理
- (void)textViewDidChange:(UITextView *)textView{
    if ([self.delegate respondsToSelector:@selector(LongPostImageViewCell:DidChangedText:)]) {
        
        NSString * toBeString =  textView.text;
        NSInteger maxLen = 200 ;
        NSDictionary *dic = [NSString StringLengthWithEmoji:toBeString AndMax:maxLen];
        NSInteger nowLen = [(NSNumber*)dic[@"allCnt"] integerValue];
        NSInteger zHLen = [(NSNumber*)dic[@"useCnt"] integerValue];
        
        //清除字数限制提示标记
        if(nowLen < maxLen){
            self.isAlreadyShowChineseCharacterToast = false;
        }
        // 键盘输入模式
        NSString *inputMode = [[UIApplication sharedApplication]textInputMode].primaryLanguage;
        if ([inputMode isEqualToString:@"zh-Hans"]) {
            //获取高亮部分
            UITextRange *selectrange = [self.textView markedTextRange];
            UITextPosition *position = [textView positionFromPosition:selectrange.start offset:0];
            if(!
               
               position){
                if (nowLen > maxLen) {
                    self.textView.text = [toBeString substringToIndex:zHLen];
                    [self cmpFontLenThenToast];
                }
                [self fixLineIfOverLimit];
            }
        } else {
            if (nowLen > maxLen) {
                self.textView.text = [toBeString substringToIndex:zHLen];
                    [self cmpFontLenThenToast];
            }
            [self fixLineIfOverLimit];
        }
        
        
        [self.delegate LongPostImageViewCell:self DidChangedText:self.textView.text];
        // 文本框换行-----------------------------------------------
        CGFloat nowTextViewHeight  =  self.getNowTextViewHeight;
        if (self.textViewSaveHeight != nowTextViewHeight ) {
            self.textViewSaveHeight = nowTextViewHeight;
            [self setNeedsLayout];
            if ([self.delegate respondsToSelector:@selector(LongPostImageView:DidChangedHeight:)]) {
                [self.delegate LongPostImageView:self DidChangedHeight:self.textViewSaveHeight];
              }
        }
    }
    [self placeHolderSet];
}

动态改变高度

 - (void)textViewDidChange:(UITextView *)textView{
  //获取文本中字体的size
  CGSize size = [self sizeWithString:textView.text font:QianBaoFont(F3_14) width:textView.width];
  NSLog(@"height = %f",size.height);
  //获取一行的高度
  CGSize size1 = [self sizeWithString:@"Hello" font:QianBaoFont(F3_14) width:textView.width];
  NSInteger i = size.height/size1.height;
  if (i==1) {
      //设置全局的变量存储数字如果换行就改变这个全局变量
      self.number = i;
  }
  if (self.number!=i) {
      self.number = i;
      NSLog(@"selfnum = %ld",self.number);
      self.textView.height = size.height;
      [self.tableView reloadRowsAtIndexPaths:@[self.indexPahth] withRowAnimation:(UITableViewRowAnimationAutomatic)];
  }
}