tableView_cell中label自适应高度

 1 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
 2     
 3     Commodity *com = [self.comArr objectAtIndex:indexPath.row];
 4 //    跟据label中字数的多少，字数的大小和label自身的宽度，来确定其所占的高度。
 5     CGRect rect = [com.description1 boundingRectWithSize:CGSizeMake(167, 1000)
 6                                                  options:NSStringDrawingUsesLineFragmentOrigin
 7                                               attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:14]}
 8                                                  context:nil];
 9 //    cell中控件儿的固定高度加上label的变化的高度，确定cell的高度
10     return 80 + rect.size.height;
11 }

 1 - (void)setCom:(Commodity *)com {
 2     
 3     self.comName.text = com.title;
 4     self.comDescription.text = com.description1;
 5     
 6 //    在cell类中，在重写的某一实例变量中使label自适应高度
 7     CGRect frame = self.comDescription.frame;
 8     CGRect rect = [self.comDescription.text boundingRectWithSize:CGSizeMake(167, 1000)
 9                                                          options:NSStringDrawingUsesLineFragmentOrigin
10                                                       attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:14]}
11                                                          context:nil];
12     frame.size.height = rect.size.height;
13     self.comDescription.frame = frame;
14 }