Resize UITableviewCell when content changes - uitableview

Question

I have a TableViewCell with a label, a button and a hidden textfield of size 0.
If the user tapps the button the textfield should become visible. So far so good. But in console I get a constraint error during that animation because the textfield needs more space than the cell is currently sized.
How can I avoid the constraint error?
Here is my implementation:
func showTextField(show:Bool){
if show{
if textFieldHeightConstraint.constant != 200{
UIView.animate(withDuration: 0.4) { [weak self] in
self?.textFieldHeightConstraint.constant = 200
self?.feedbackTextView.isHidden = false
self?.viewModel?.refreshTableView()
}
}
}
else{
textFieldHeightConstraint.constant = 0
feedbackTextView?.text = "TODO"
feedbackTextView.isHidden = true
viewModel?.refreshTableView()
}
}
//in controller then:
func refreshTableView(){
tableView.beginUpdates()
tableView.endUpdates()
}
Constraint Error:
(
"<NSLayoutConstraint:0x600000a3fa70 UITextView:0x7f8cd4073e00'TODO'.height == 200 (active)>",
"<NSLayoutConstraint:0x600000a13020 V:|-(16)-[UILabel:0x7f8cd2e19130'M\U00f6chten Sie zu dieser Rec...'] (active, names: '|':UITableViewCellContentView:0x7f8cd2e140d0 )>",
"<NSLayoutConstraint:0x600000a0fb10 V:[UILabel:0x7f8cd2e19130'M\U00f6chten Sie zu dieser Rec...']-(8)-[UIButton:0x7f8cd2e16ea0'Add remark'] (active)>",
"<NSLayoutConstraint:0x600000a0a490 V:[UITextView:0x7f8cd4073e00'TODO']-(>=16)-| (active, names: '|':UITableViewCellContentView:0x7f8cd2e140d0 )>",
"<NSLayoutConstraint:0x600000a32440 V:[UIButton:0x7f8cd2e16ea0'Add remark']-(8)-[UITextView:0x7f8cd4073e00'TODO'] (active)>",
"<NSLayoutConstraint:0x600000a484b0 'UIView-Encapsulated-Layout-Height' UITableViewCellContentView:0x7f8cd2e140d0.height == 156 (active)>"
)