Fading Headers

Question

Fading Headers

Here's the table view itself.

I managed to set up animated cells. I created a global variable called rowHeight in type CGFloat and implicitly assigned it as 40. I wrote this code:

func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {


        return rowHeight
    }

In touch event:

@IBAction func lessonCollapser(sender: AnyObject) {

        if rowHeight == 40 {

        self.tableView.beginUpdates()

        UIView.animateWithDuration(1, animations: {self.rowHeight = 0})

        self.tableView.endUpdates()

        } else if rowHeight == 0 {

            self.tableView.beginUpdates()

            UIView.animateWithDuration(1, animations: {self.rowHeight = 40})

            self.tableView.endUpdates()

        }

    }

So far so good. Despite the fact that he is animating, there are several problems.

First: My custom headers disappear.

Second: I get the error: "There is no pointer path to use the table cell." I think because there are no index paths, the headings are gone. It is expected. What is not expected is why my table index paths disappeared when I used the animation? I think this is due to beginUpdates()and endUpdates(). Can someone advise me to do something?

Code for my header:

func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {



        let headerCell = tableView.dequeueReusableCellWithIdentifier("HeaderCell") as! lessonHeaderTableViewCell

        switch (section) {

        default:
            headerCell.lessonHeader.setTitle("TEST HEADER", forState: .Normal)

        }


        return headerCell
    }