tableView section headers disappear SWIFT

问题

I have a tableView set up so that when a cell is touched, it expands in height to reveal more information. The tableView has 5 sections.

I have a bug: when a cell expands, all headersCells below that cell go invisible. The console outputs the following: "[31233:564745] no index path for table cell being reused"

In my storyboard I have 2 custom cells : "myCell" for the data bearing cells, and "headerCell" for the headers.

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

   let thisGoal : GoalModel = goalArray[indexPath.section][indexPath.row]


    if self.currentPath != nil && self.currentPath == indexPath  {
        self.currentPath = nil
    } else {
        self.currentPath = indexPath
    }
    tableView.beginUpdates()
    tableView.endUpdates()
}

If I enter tableView.reloadData() in between the begin/end updates, it functions properly, although the header background turns black, and loses animation.

I have all of the stuff for headers declared in: func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView?

what am I missing? I'd really like the tableView to still have animations, and keep the background clearColor().

Thanks in advance. I did read through the objective C answers, but couldn't get them to work for me. I'd really appreciate some SWIFT help.

I think the problem is the no index path for table cell being reused.

回答1:

I found an answer in the console output. Use this code in the header function:

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

Do not return your headerCell, or your reusable identifier. Return the reuseIdentifier.contentView. For me it's: return headerCell!.contentView.

回答2:

Just to add, I was baffled for WAY longer than I should have been as to why I couldn't refer to the contentView of my cell, when I could quite clearly see it was there. My custom class (using UITableViewCell rather than UITableViewHeaderFooterView) would return a fatal error each time. Therefore make sure any custom styling is setup under UITableViewHeaderFooterView class like:

class CustomHeaderCell: UITableViewHeaderFooterView {

You will also need to register the resuableIdentifer like this:

tableView.registerNib(UINib(nibName: "HeaderCell", bundle: nil), forHeaderFooterViewReuseIdentifier: "CellHeader")

Then this bad boy:

    func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
    let headerCell = tableView.dequeueReusableHeaderFooterViewWithIdentifier("CellHeader") as! CustomHeaderCell!
    return headerCell!.contentView
}

回答3:

Since I'm not at 50 reputation yet, I can't comment on the previous answer, so I apologize for listing this as another answer.

Returning the ContentView will make the function work but will remove all formatting done to the reuseIdentifier (headerCell)

headerCell.backgroundColor = UIColor.cyanColor()

This will NOT provide a Cyan color to your headerCell

To fix this, just add the ".contentView" to your formatting lines

headerCell.contentView.backgroundColor = UIColor.cyanColor()

回答4:

Table view headers in 2 tables disappeared when I converted my app to IOS 10 - I found the reason in Apple developer API documentation on table headers. When I added the following, the missing headers reappeared!

override func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat
{
return 44 // where 44 is the header cell view height in my storyboard
}

回答5:

I had the same bug because I was returning a cell using dequeue method instead of a UITableViewHeaderFooterView.

Solution:

Add a view outside of the view hierarchy
Set the type to UITableViewHeaderFooterView
Customize
Link to an @IBOutlet
In func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? return the outlet

Common pitfalls:

Don't forget to set the header sizes Don't forget to set the outlet as strong.

回答6:

You could wrap the tableviewcell inside a UIView

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

let containerView = UIView()
guard let headerCell = tableView.dequeueReusableCell(withIdentifier: "MyHeaderView") as? MyHeaderView else { fatalError(" Failed to load MyHeaderView") }
containerView.addSubview(headerCell)
return containerView
}

来源：https://stackoverflow.com/questions/30149551/tableview-section-headers-disappear-swift

标签

ios

uitableview

swift

header

nsindexpath