iOS10 - ContentView Blocking Touches of UIButton in UITableView Header

I am in the process of updating my app to iOS10 with Swift 2.3 and Xcode 8 Beta 1 and I have found that there is a UITableViewHeaderFooterContentView which is blocking touches to the UIButton on my subclass of UITableViewHeaderFooterView.

On the Xcode 8 Beta 1 simulator the UIButton works on iOS9.3 but not iOS10.

1) Is there any documentation for this?

2) How can I ensure my UI elements are on top of the new Content View in iOS10? (or allow touches through the UITableHeaderFooterContentView)

Thanks!

Table Header

import UIKit

class TableHeader: UITableViewHeaderFooterView {

    @IBOutlet weak var dayLabel: UILabel!

    @IBOutlet weak var dateLabel: UILabel!

    @IBOutlet weak var addNewEventButton: UIButton!

}

Code In View Controller dateCell.addNewEventButton is the UIButton that is no longer receiving touches in iOS10

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


    let tintColor = TintManager().getTintColour()

    let dateCell:TableHeader = tableView.dequeueReusableHeaderFooterViewWithIdentifier("TableHeader") as! TableHeader

    //dateCell.bringSubviewToFront(dateCell.addNewEventButton)

    dateCell.dayLabel.text = Dates.day.uppercaseString

    dateCell.dateLabel.text = Dates.date

        dateCell.backgroundView = UIView(frame: dateCell.frame)
        dateCell.backgroundView!.backgroundColor = tintColor
        dateCell.dayLabel.textColor = UIColor.whiteColor()
        dateCell.dateLabel.textColor = UIColor.whiteColor()
        dateCell.addNewEventButton.backgroundColor = tintColor



    dateCell.addNewEventButton.tag = section
    dateCell.addNewEventButton.layer.cornerRadius = 20.0

    if (savedEventView.superview === self.view) {
        dateCell.addNewEventButton.removeTarget(nil, action: nil, forControlEvents: .AllEvents)
        dateCell.addNewEventButton.addTarget(self, action: #selector(ViewController.userPressedAddButtonToInsertSavedEvent(_:)), forControlEvents:.TouchUpInside)
    } else {
        dateCell.addNewEventButton.removeTarget(nil, action: nil, forControlEvents: .AllEvents)
        dateCell.addNewEventButton.addTarget(self, action: #selector(ViewController.userPressedAddNewEventOnTableViewHeader(_:)), forControlEvents:.TouchUpInside)
    }

    return dateCell
}