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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

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