UITableView dynamic cell heights only correct after some scrolling

Question

I have a UITableView with a custom UITableViewCell defined in a storyboard using auto layout. The cell has several multiline UILabels.

Answer 1

I tried all of the solutions in this page but unchecking use size classes then checking it again solved my problem.

Edit: Unchecking size classes causes a lot of problems on storyboard so I tried another solution. I populated my table view in my view controller's viewDidLoad and viewWillAppear methods. This solved my problem.

Answer 2

The problem is that the initial cells load before we have a valid row height. The workaround is to force a table reload when the view appears.

- (void)viewDidAppear:(BOOL)animated
{
  [super viewDidAppear:animated];
  [self.tableView reloadData];
}

Answer 3

calling cell.layoutIfNeeded() inside cellForRowAt worked for me on ios 10 and ios 11, but not on ios 9.

to get this work on ios 9 also, I call cell.layoutSubviews() and it did the trick.

Answer 4

I have the issue with resizing label so I nee just to do
chatTextLabel.text = chatMessage.message chatTextLabel?.updateConstraints() after setting up the text

// full code

func setContent() {
    chatTextLabel.text = chatMessage.message
    chatTextLabel?.updateConstraints()

    let labelTextWidth = (chatTextLabel?.intrinsicContentSize().width) ?? 0
    let labelTextHeight = chatTextLabel?.intrinsicContentSize().height

    guard labelTextWidth < originWidth && labelTextHeight <= singleLineRowheight else {
      trailingConstraint?.constant = trailingConstant
      return
    }
    trailingConstraint?.constant = trailingConstant + (originWidth - labelTextWidth)

  }

Answer 5

In my case, I was updating in other cycle. So tableViewCell height was updated after labelText was set. I deleted async block.

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
     let cell = tableView.dequeueReusableCell(withIdentifier:Identifier, for: indexPath) 
     // Check your cycle if update cycle is same or not
     // DispatchQueue.main.async {
        cell.label.text = nil
     // }
}

Answer 6

For me none of these approaches worked, but I discovered that the label had an explicit Preferred Width set in Interface Builder. Removing that (unchecking "Explicit") and then using UITableViewAutomaticDimension worked as expected.