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 Constraints in Code

Matthew Ingram
PLUS
Matthew Ingram
Courses Plus Student 4,718 Points
Posted by Matthew Ingram
Matthew Ingram
Courses Plus Student 4,718 Points

Confused about why this is incorrect, there are no errors when i preview it.

It's saying I don't have the proper containers, not sure whats broken

layout.swift 
class MyViewController: UIViewController {

    let sampleView = UIView()

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(sampleView)
    }

    override func viewWillLayoutSubviews() {
        super.viewWillLayoutSubviews()
        sampleView.translatesAutoresizingMaskIntoConstraints = false

        // Add constraints below
            let sampleViewHeightSpaceConstraint = NSLayoutConstraint(item: sampleView, attribute: .height, relatedBy: .equal,
            toItem: view, attribute: .notAnAttribute, multiplier: 1.0, constant: 50.0)

            let sampleViewWidthSpaceConstraint = NSLayoutConstraint(item: sampleView, attribute: .width, relatedBy: .equal,
            toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 50.0)

            let sampleViewCenterXSpaceConstraint = NSLayoutConstraint(item: sampleView, attribute: .centerX, relatedBy: .equal,
            toItem: view, attribute: .centerX, multiplier: 1.0, constant: 0.0)

            let sampleViewCenterYConstraint = NSLayoutConstraint(item: sampleView, attribute: .centerY, relatedBy: .equal,
            toItem: view, attribute: .centerY, multiplier: 1.0, constant: 0.0)
    view.addConstraints([
    sampleViewHeightSpaceConstraint, 
    sampleViewWidthSpaceConstraint, 
    sampleViewCenterXSpaceConstraint,
    sampleViewCenterYConstraint
    ])
    }

}

1 Answer