UITextview text not centering vertically on initial view

Question

I have an extension for UITextView which centers the text on a UITextView vertically that I found in the following SO answer: https://stackoverflow.com/a/38855122/4660602

My UITextView lives within a UITableViewCell, and the problem is that the function doesn't seem to work on the initial load. It only works when I reload the tableView or when I scroll.

I am calling the method within cellForRowAtIndexPath but I have tried adding it to my custom cell class in awakeFromNib and prepareForReuse but have and no luck. Wondering if anyone has any other advice / solutions.

EDIT:

Also forgot to mention, my VC with the tableView is embedded in a navigationBar and tabBar. When I switch to a new VC in the tabBar and then back, the UITextView text realigns to the top incorrectly, even if it was centered already.

Thanks!

score 1 · Accepted Answer · answered Oct 31 '16 at 04:17

The correct place for sizing code in a view is UIView.layoutSubviews. Since your centering function depends on the bounds, you have to call it in layoutSubviews, otherwise the bounds may not be correct (ie they match whats in the nib and not the current device). You can call setNeedsLayout in your cellforRowAtIndexPath to tell the view to update its layout after you ahve set the text.

score 0 · Answer 2 · edited Oct 31 '16 at 07:43

0

In iOS 10, a bound of view hasn't initialized in viewDidLoad or awakeFromNib as before, so functions based on the view's bound don't work in viewDidLoad or awakeFromNib. You should use it in viewDidAppear or when view's bound has certainly been initialized.

edited Oct 31 '16 at 07:43

James Jones

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answered Oct 31 '16 at 05:15

Lionking

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score 0 · Answer 3 · answered May 14 '20 at 17:07

Works for me (Swift 5):

class VerticallyCenteredTextView: UITextView {
  override var contentSize: CGSize {
    didSet {
      var topCorrection = (bounds.size.height - contentSize.height * zoomScale) / 2.0
      topCorrection = max(0, topCorrection)
      contentInset = UIEdgeInsets(top: topCorrection, left: 0, bottom: 0, right: 0)
    }
  }
}

The source - https://geek-is-stupid.github.io/2017-05-15-how-to-center-text-vertically-in-a-uitextview/

UITextview text not centering vertically on initial view

3 Answers3