UITableView header dynamic height in run-time

I'm using XCode 10.3 and this is my solution worked with your second solution using table header view.

First, you would create a separating view with xib file, for example with a label inside. And you apply the constraints for this label, top, left, bottom, right to the cell's container view. And set numberOfLines = 0.

Update your awakeFromNib() function inside your view class.

override func awakeFromNib() {
    super.awakeFromNib()
    ourLabel.translatesAutoresizingMaskIntoConstraints = false
}

Second, on your viewController, setup your tableView:

tableView.sectionHeaderHeight = UITableView.automaticDimension
tableView.estimatedSectionHeaderHeight = 64

Remember don't delegate this method:

func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat

because we set the constraints of our view already.

Finally, you return it on the delegate method

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

the view for header.

let view = UINib(nibName: String(describing: SimpleHeaderTitleView.self), bundle: nil).instantiate(withOwner: nil, options: nil)[0] as! SimpleHeaderTitleView
 view.ourLabel.text = "Your longgggg text"
 return view

Done! Check it works.

I like the way it's done here:

• If you want to set your tableview header height dynamically based on it's content, just call self.tableView.layoutTableFooterView() right after you have set your headerView as TableViewHeader (so after self.tableView.tableHeaderView = view )

• If you need to update your tableview header height on runtime, also call self.tableView.layoutTableFooterView() right after you have updated the values of your tableview header.

(This obviously also works with tableviewFooters, though, is not to be used for sectionHeaders/Footers)

extension UITableView {

    //Variable-height UITableView tableHeaderView with autolayout
    func layoutTableHeaderView() {

        guard let headerView = self.tableHeaderView else { return }
        headerView.translatesAutoresizingMaskIntoConstraints = false

        let headerWidth = headerView.bounds.size.width
        let temporaryWidthConstraint = headerView.widthAnchor.constraint(equalToConstant: headerWidth)

        headerView.addConstraint(temporaryWidthConstraint)

        headerView.setNeedsLayout()
        headerView.layoutIfNeeded()

        let headerSize = headerView.systemLayoutSizeFitting(UILayoutFittingCompressedSize)
        let height = headerSize.height
        var frame = headerView.frame

        frame.size.height = height
        headerView.frame = frame

        self.tableHeaderView = headerView

        headerView.removeConstraint(temporaryWidthConstraint)
        headerView.translatesAutoresizingMaskIntoConstraints = true
    }

}

source

Copied from useyourloaf.com

Swift 5.0

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()

    guard let headerView = tableView.tableHeaderView else {return}
    let size = headerView.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize)
    if headerView.frame.size.height != size.height {
        headerView.frame.size.height = size.height
        tableView.tableHeaderView = headerView
        tableView.layoutIfNeeded()
    }
}

Step One :

From interface builder Drag a UIView and drop into

UItableView 

This view will automatically act as a UITableView Header (Mind it not section Header) . Suppose this the width of this view is 200 .If you run the UItableView This view will automatically appear as a Header .

Create a Outlet of this drag-drop View .

@property (weak, nonatomic) IBOutlet UIView *tableViewHeader; // height of this view is 200

Now my goal is increase the height of the table View header .

Step Two :

Add this method

- (void)viewDidLayoutSubviews
{
int increasedHeight = 100;
// set a frame of this view Like example 
self.tableViewHeader.frame = CGRectMake(0, 0, self.view.frame.size.width , 200 + increasedHeight );

self.tableView.tableHeaderView = self.tableViewHeader;

}

Now you tableview header height will be 300 .

If you are using Interface Builder simply you check these buttons

You can do that in viewDidLayoutSubviews of the UIViewController that contains your UITableView:

@IBOutlet weak var tableView: UITableView!

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()

    // Resize header view with dynamic size in UITableView
    guard let headerView = tableView.tableHeaderView else {
        return
    }
    let size = headerView.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize)
    if headerView.frame.height != size.height {
        tableView.tableHeaderView?.frame = CGRect(
            origin: headerView.frame.origin,
            size: size
        )
        tableView.layoutIfNeeded()
    }
}