我在UITableView中的标题视图未添加到UIView层次结构中

Question

Using UITableView and NSFetchedResultsController I refresh and display the content of my table. At some point I hava a screen without header view. It should be instead of the space between cells.

When I debug View hierarchy I have the following info. Selected cell in UI View hierarchy is appriopriate to the selected cell in Debug View Hierarchy .

To create a header view I use following method:

override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
    let workday = workDayObjectForSection(section)
    let cell = tableView.dequeueReusableCellWithIdentifier(PBOUserWorkDayCellIdentifier) as! PBOUserWorkDayTableViewCell
    cell.configureCellWithWorkDay(workday)

    return cell
}

Answer 1

You shouldn't get view for tableView header using dequeueReusableCellWithIdentifier method. From the documentation :

If a cell object is reusable you assign it a reuse identifier (an arbitrary string) in the storyboard. At runtime, the table view stores cell objects in an internal queue. When the table view asks the data source to configure a cell object for display, the data source can access the queued object by sending a dequeueReusableCellWithIdentifier: message to the table view, passing in a reuse identifier

That means when you return header as reuse cell, tableView might take it do display in another place as cell. Note that behavior of header is different than cell, it stays at the top while section is visible.

However, you may use same view for header but create it from xib , storyboard etc every time and do not assign any reuse identifier. And if you looking for some optimization, you can store them in some array and return cached values. But I would like to recommend not to use subclasses of UITableViewCell as table header views