Update tableView's headerView on device rotation

Question

I have table view with a custom header view. In the header view I have a subview that is a UIImage. On rotation, the header view and it's subviews don't update to where they should be. Instead, they retain their positions until the user either presses a button, moves to a different page, etc. Essentially, their positions don't update until the user interacts with the app in some way.

I am detecting device rotation with:

    override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
        // Update header views!
    }

I can't find any sort of code that will update the header view and it's subviews though. Any help appreciated.

EDIT: Here is the code for my header view:

  override func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        let headerView = UIView(frame: CGRectMake(0, 0, tableView.frame.size.width, tableView.sectionHeaderHeight))
        let headerColor = UIColor.blueColor()
        headerView.backgroundColor = headerColor

        headerView.tag = section

        let headerString = UILabel(frame: CGRect(x: 10, y: 10, width: tableView.frame.size.width-45, height: 30)) as UILabel
        headerString.text = "Title"
        headerString.textColor = UIColor.whiteColor()
        headerView.addSubview(headerString)
        let headerTapped = UITapGestureRecognizer(target: self, action:"sectionHeaderTapped:")
        headerView.addGestureRecognizer(headerTapped)

        // Button in header
        let gearImage = UIImage(named: "icons_button")
        let width = CGFloat(45)
        let rightInset = CGFloat(10)
        let headerButton = UIButton(frame: CGRect(x: headerView.frame.maxX - 45, y: 7, width: width, height: width - rightInset))
        headerButton.setImage(gearImage, forState: UIControlState.Normal)
        headerButton.tag = section
        headerButton.contentEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: rightInset)
        headerButton.addTarget(self, action: "userButtonPress:", forControlEvents: UIControlEvents.TouchUpInside)
        headerView.addSubview(headerButton)

        return headerView
    }

Answer 1

在viewForHeaderInSection中添加类似UIVIEW的容器，然后在容器中添加类似label的childview，然后添加此行

label.autoresizingMask = .flexibleWidth

Answer 2

在您的旋转函数中：

self.view.layoutIfNeeded()

Answer 3

Although it seems like overkill, this works well:

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
  [coordinator animateAlongsideTransition: ^(id<UIViewControllerTransitionCoordinatorContext> _Nonnull context) {
    [_myTableView reloadData];
  } completion:^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {
    [_myTableView reloadData];
  }];
}