Fitting Views to Their Content (edges cases)

snippets.swift

/**
  Calculates and adjusts the frame of a web view to fit its content
  http://stackoverflow.com/a/3937599/7066201
*/
func calculateWebViewSize() {
    self.view.layoutIfNeeded()

    var frame = self.webview.frame
    frame.size.height = 1
    self.webview.frame = frame

    let fittingSize = self.webview.sizeThatFits(.zero)
    frame.size = fittingSize

    self.webview.frame = frame
    self.webViewHeightConstraint.constant = frame.size.height
    self.view.layoutIfNeeded()
}

/**
  UITableView header/footer views (not to be confused with section header/footer views) do not use autolayout.
  Therefore you have to manually adjust the `tableViewHeader`/`tableViewFooter` frame to be the size that fits
  your custom view.
  http://stackoverflow.com/a/29964310/7066201
*/
func sizeFooterToFit() {
    guard let footer = self.tableView.tableFooterView else { return }

    footer.setNeedsLayout()
    footer.layoutIfNeeded()

    let height = footer.systemLayoutSizeFitting(UILayoutFittingCompressedSize).height
    var frame = footer.frame

    frame.size.height = height
    footer.frame = frame

    self.tableView.tableFooterView = footer
}