How can I use Autolayout to set constraints on my UIScrollview?

Question

I have spent two days trying out the various solutions for Mixed and Pure Autolayout approaches to achieve what was a trivial scrollview setup prior to autolayout, and it\'s

Answer 1

In swift you can use this working solution.

Contraints

ScrollView: Leading, Trailing, Top, Bottom = Superview

ContentView: Leading, Trailing, Top, Bottom = ScrollView. Height fixed/relative to content.

You can set the width constraint(contentView) to equal scrollviews superview, but select remove remove on build time because you will be adding that constraint programmatically. This is just so the IB doesn't complain with warnings.

extension UIView {

    func setupContentViewForViewWithScroll(contentView vwContent : UIView) {
        //Set constraint for scrollview content
        let constraint = NSLayoutConstraint(item: vwContent, attribute: NSLayoutAttribute.Width, relatedBy: .Equal, toItem: nil, attribute: NSLayoutAttribute.NotAnAttribute, multiplier: 1, constant: self.bounds.size.width)
        vwContent.addConstraint(constraint)
        self.layoutSubviews()
    }

}

And in the View Controller viewDidLayoutSubviews i just call this method:

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    self.view.setupContentViewForViewWithScroll(contentView: vwContent)
}