Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

iOS Introduction to Auto Layout in iOS Auto Layout in Code Using Layout Anchors

Monte DeKam
Monte DeKam
2,478 Points

Help with AutoLayout Objective using Anchors

Can anyone help figure out what I'm doing wrong here?

I'm getting a compiler error that says that view has no property "layoutMarginsGuide", but at least in Swift 3.0 it is available. Should I be using a different property here?

Thanks!

layout.swift
class MyViewController: UIViewController {

    let blueView = UIView()
    let greenView = UIView()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(greenView)
        view.addSubview(blueView)
    }

    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()
        blueView.translatesAutoresizingMaskIntoConstraints = false
        greenView.translatesAutoresizingMaskIntoConstraints = false

        NSLayoutConstraint.activate([
            NSLayoutConstraint(item: blueView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 100.0),
            NSLayoutConstraint(item: blueView, attribute: .width, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 150.0),
            NSLayoutConstraint(item: blueView, attribute: .left, relatedBy: .equal, toItem: view, attribute: .leftMargin, multiplier: 1.0, constant: 8.0),
            NSLayoutConstraint(item: blueView, attribute: .top, relatedBy: .equal, toItem: self.topLayoutGuide, attribute: .bottom, multiplier: 1.0, constant: 8.0),
            NSLayoutConstraint(item: blueView, attribute: .right, relatedBy: .equal, toItem: view, attribute: .rightMargin, multiplier: 1.0, constant: -8.0)
        ])

        // Add constraint code below
          NSLayoutConstraint.activate([
            greenView.topAnchor.constraint(equalTo: blueView.bottomAnchor, constant: 8),
            greenView.leftAnchor.constraint(equalTo: view.layoutMarginsGuide.leftAnchor, constant: 8),
            greenView.rightAnchor.constraint(equalTo: view.layoutMarginsGuide.rightAnchor, constant: 8),
            greenView.heightAnchor.constraint(equalToConstant: 75)
            ])



    }
}