设置一个缓存高度的字典

<pre>@property (nonatomic, strong) NSMutableDictionary *heightAtIndexPath;//缓存高度
</pre>

实行懒加载

<pre>

pragma mark - Getters

• (NSMutableDictionary *)heightAtIndexPath
  {
  if (!_heightAtIndexPath) {
  _heightAtIndexPath = [NSMutableDictionary dictionary];
  }
  return _heightAtIndexPath;
  }
  </pre>

如果想要移除plain下面多出来的分割线

请在这个方法里执行
<pre>

• (void)viewDidLoad
  {
  [super viewDidLoad];
  //如果想去除plain下面多出来的分割线
  //那么就

  self.tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];
  

}
</pre>

下面方法给一个预算高度

<pre>#pragma mark - UITableViewDelegate
-(CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSNumber *height = [self.heightAtIndexPath objectForKey:indexPath];
if(height)
{
return height.floatValue;
}
else
{
return 100;
}
}
</pre>

在willdisplay方法里把计算的高度缓存一下

<pre>

• (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
  {
  NSNumber *height = @(cell.frame.size.height);
  [self.heightAtIndexPath setObject:height forKey:indexPath];

  /此处做了个简单的动画效果/
  NSArray * array = tableView.indexPathsForVisibleRows;
  NSIndexPath * firstIndexPath = array [0];
  cell.layer.anchorPoint = CGPointMake(0, 0.5);
  cell.layer.position = CGPointMake(cell.layer.position.x, cell.layer.position.y);
  if (firstIndexPath.row < indexPath.row) {
  cell.layer.transform = CATransform3DMakeRotation(M_PI_2, 0, 0, 0.5);
  }else {
  cell.layer.transform = CATransform3DMakeRotation(-M_PI_2, 0, 0, 1.0);
  }
  cell.alpha = 0;
  [UIView animateWithDuration:1.0 animations:^{
  cell.layer.transform = CATransform3DIdentity;
  cell.alpha = 1.0;
  }];

}
</pre>

如果要进行数据的刷新 请把heightAtIndexPath清空，重新计算高度