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

Posted by 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)
            ])



    }
}