Calculate UITableView expected height

Question

I have UITableView with 2 cells that do AutoLayout (quite simple, UILabel and UISwitch, and UILabel and UIImageView). I want to get tableView heihgt. UITableView reside to UIView, so i did following:

 override func layoutSubviews() {
    super.layoutSubviews()
    if !isLayoutSubviewsDone {
      expectedHeight = tableView.contentSize.height
      isLayoutSubviewsDone = true
      didLayoutSubivews?()
    }
  }

unfortunately, tableView.contentSize.height is smaller that it should be. for about 20%. How to get exact height amount?

doe this helps -> https://stackoverflow.com/a/38035450/8374890 — Keshu R., Dec 09 '19 at 09:24
if cell is fixed height with one line label, cellHeight * cellTotalRows = height — jdleung, Dec 09 '19 at 09:39
@Evgeniye Did you tried with observer on tableView. If not please try for reference my answer. It will give you exact tableView Height for each and every cell. — Abdul Hoque Nuri, Dec 09 '19 at 09:52

matt · Accepted Answer · 2019-12-09T09:19:46.407

1

How to get exact height amount?

There is no magic way to size a table to its contents. The table view has no automatic size. It is not magically sized by the heights of its cells. You have to work out the height of every cell yourself, one at a time, and add them up.

edited Dec 09 '19 at 09:19

answered Dec 09 '19 at 09:18

matt

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seems tedious, what amount content size returns then? – Evgeniy Kleban Dec 09 '19 at 09:18
That is irrelevant. And yes, it is tedious. But it is a previously solved problem. – matt Dec 09 '19 at 09:20
i asked what is tableView.contentSize.height returns then.. there is an actual value that almost correct – Evgeniy Kleban Dec 09 '19 at 09:26

score 1 · Answer 2 · answered Dec 09 '19 at 09:49

If you add observer to TableView, I'm sure you will get exact table view height. Try below code.

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        expectedHeight.constant = tableView.contentSize.height
    }

//MARK:- Add Observer on Reload tableView

   tableView.addObserver(self, forKeyPath: "tableViewObserver", options: [], context: nil)
   tableView.reloadData()

Calculate UITableView expected height

2 Answers2