iOS cell 高度计算

iOS cell 高度计算

• heightForCell:

  • 每一个cell对应一个模型，模型里面有cell的高度，以及对图片frame的重新赋值；
    

    - (CGFloat)cellHeight
    {
    if (!_cellHeight) {
        // 文字的最大尺寸
        CGSize maxSize = CGSizeMake([UIScreen mainScreen].bounds.size.width - 2 * XMGTopicCellMargin, MAXFLOAT);
        // 计算文字的高度
        CGFloat textH = [self.text boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName : [UIFont systemFontOfSize:14]} context:nil].size.height;
    
        // cell的高度
        // 文字部分的高度
        _cellHeight = XMGTopicCellTextY + textH + XMGTopicCellMargin;
    
        // 根据段子的类型来计算cell的高度
        if (self.type == XMGTopicTypePicture) { // 图片帖子
            if (self.width != 0 && self.height != 0) {
                // 图片显示出来的宽度
                CGFloat pictureW = maxSize.width;
                // 显示显示出来的高度
                CGFloat pictureH = pictureW * self.height / self.width;
                if (pictureH >= XMGTopicCellPictureMaxH) { // 图片高度过长
                    pictureH = XMGTopicCellPictureBreakH;
                    self.bigPicture = YES; // 大图
                }
    
                // 计算图片控件的frame
                CGFloat pictureX = XMGTopicCellMargin;
                CGFloat pictureY = XMGTopicCellTextY + textH + XMGTopicCellMargin;
                _pictureF = CGRectMake(pictureX, pictureY, pictureW, pictureH);
    
                _cellHeight += pictureH + XMGTopicCellMargin;
            }
        } else if (self.type == XMGTopicTypeVoice) { // 声音帖子
            CGFloat voiceX = XMGTopicCellMargin;
            CGFloat voiceY = XMGTopicCellTextY + textH + XMGTopicCellMargin;
            CGFloat voiceW = maxSize.width;
            CGFloat voiceH = voiceW * self.height / self.width;
            _voiceF = CGRectMake(voiceX, voiceY, voiceW, voiceH);
    
            _cellHeight += voiceH + XMGTopicCellMargin;
        } else if (self.type == XMGTopicTypeVideo) { // 视频帖子
            CGFloat videoX = XMGTopicCellMargin;
            CGFloat videoY = XMGTopicCellTextY + textH + XMGTopicCellMargin;
            CGFloat videoW = maxSize.width;
            CGFloat videoH = videoW * self.height / self.width;
            _videoF = CGRectMake(videoX, videoY, videoW, videoH);
    
            _cellHeight += videoH + XMGTopicCellMargin;
        }
    
        // 如果有最热评论
        if (self.top_cmt) {
            NSString *content = [NSString stringWithFormat:@"%@ : %@", self.top_cmt.user.username, self.top_cmt.content];
            CGFloat contentH = [content boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName : [UIFont systemFontOfSize:13]} context:nil].size.height;
            _cellHeight += XMGTopicCellTopCmtTitleH + contentH + XMGTopicCellMargin;
        }
    
        // 底部工具条的高度
        _cellHeight += XMGTopicCellBottomBarH + XMGTopicCellMargin;
    }
    return _cellHeight;
    }

• 返回cell的高度

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• 给子视图传数据

  
  - (void)setTopic:(XMGTopic *)topic
  {
  _topic = topic;
  
  // 新浪加V
  self.sinaVView.hidden = !topic.isSina_v;
  
  // 设置头像
  [self.profileImageView setHeader:topic.profile_image];
  
  // 设置名字
  self.nameLabel.text = topic.name;
  
  // 设置帖子的创建时间
  self.createTimeLabel.text = topic.create_time;
  
  // 设置按钮文字
  [self setupButtonTitle:self.dingButton count:topic.ding placeholder:@"顶"];
  [self setupButtonTitle:self.caiButton count:topic.cai placeholder:@"踩"];
  [self setupButtonTitle:self.shareButton count:topic.repost placeholder:@"分享"];
  [self setupButtonTitle:self.commentButton count:topic.comment placeholder:@"评论"];
  
  // 设置帖子的文字内容
  self.text_label.text = topic.text;
  
  // 根据模型类型(帖子类型)添加对应的内容到cell的中间
  if (topic.type == XMGTopicTypePicture) { // 图片帖子
      self.pictureView.hidden = NO;
      self.pictureView.topic = topic;
      self.pictureView.frame = topic.pictureF;
  
      self.voiceView.hidden = YES;
      self.videoView.hidden = YES;
  } else if (topic.type == XMGTopicTypeVoice) { // 声音帖子
      self.voiceView.hidden = NO;
      self.voiceView.topic = topic;
      self.voiceView.frame = topic.voiceF;
  
      self.pictureView.hidden = YES;
      self.videoView.hidden = YES;
  } else if (topic.type == XMGTopicTypeVideo) { // 视频帖子
      self.videoView.hidden = NO;
      self.videoView.topic = topic;
      self.videoView.frame = topic.videoF;
  
      self.voiceView.hidden = YES;
      self.pictureView.hidden = YES;
  } else { // 段子帖子
      self.videoView.hidden = YES;
      self.voiceView.hidden = YES;
      self.pictureView.hidden = YES;
  }
  // 处理最热评论
  if (topic.top_cmt) {
      self.topCmtView.hidden = NO;
      self.topCmtContentLabel.text = [NSString stringWithFormat:@"%@ : %@", topic.top_cmt.user.username, topic.top_cmt.content];
  } else {
      self.topCmtView.hidden = YES;
  }
  }