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iOS Introduction to Auto Layout in iOS Auto Layout in Code Constraints in Code

Sam Belcher
Sam Belcher
3,719 Points
Posted by Sam Belcher
Sam Belcher
3,719 Points

Constraints in Code iOS Challenge

I asked an earlier question, though I fixed all of the typos. I still don't know what I did wrong.

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 sampleViewHeightConstraint = NSLayoutConstraint(item: sampleView, attribute: .height,
                                                            relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0,
                                                            constant: 50)

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

        let sampleViewCenterXConstraint = NSLayoutConstraint(item: sampleView, attribute: .centerX,
                                                             relatedBy: .equal, toItem: view, attribute: .bottom, multiplier: 1.0,
                                                             constant: 0)

        let sampleViewCenterYConstraint = NSLayoutConstraint(item: sampleView, attribute: .centerY,
                                                             relatedBy: .equal, toItem: view, attribute: .leadingMargin, multiplier: 1.0,
                                                             constant: 0)
       view.addConstraints([
       sampleViewHeightConstraint,
       sampleViewWidthConstaint,
       sampleViewCenterXConstraint,
       sampleViewCenterYConstraint
       ])
    }
}