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cache the height to model, may is anythings you want

```
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: cellIdForMessage(msg:array[safe: indexPath.row]), for: indexPath)

if let model = array[safe: indexPath.row] {
cell.reloadData(data: model as Any)
if (model.cellHeigth > CGFloat(0)) == false {
let size = cell.contentView.systemLayoutSizeFitting(CGSize(width: YYScreenSize().width, height: 0), withHorizontalFittingPriority: .required, verticalFittingPriority: .fittingSizeLevel)
model.cellHeigth = size.height
}
}

return cell;
}
```

Start at the UITableView cellForRow implementation shown in the issue and inspect how the model's cellHeigth value is populated and reused. Confirm how the cell's systemLayoutSizeFitting result should be retained in the model; done means repeated layout can use the cached height without recalculating it.

Written by the indexing model from the issue text.