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

Posted by STEVEN PENA
STEVEN PENA
13,928 Points

In the editor, you've been provided with a view controller subclass that contains two instances of UIView as stored prop

i know am so close the error is dont forget to add present constraint

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

        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


                // Add constraint code below
                NSLayoutConstraint.activate([
                    NSLayoutConstraint(item: greenView, attribute: .right, relatedBy: .equal, toItem: view, attribute: .rightMargin, multiplier: 1.0, constant: 8.0),
                    NSLayoutConstraint(item: greenView, attribute: .left, relatedBy: .equal, toItem: view, attribute: .leftMargin, multiplier: 1.0, constant: 8.0),
                    NSLayoutConstraint(item: greenView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 75.0),
                    ])

            }
   }
  }
     }

1 Answer

Aananya Vyas
Aananya Vyas
20,157 Points
Aananya Vyas
Aananya Vyas
20,157 Points 
NSLayoutConstraint.activate([
                    NSLayoutConstraint(item: greenView, attribute: .right, relatedBy: .equal, toItem: view, attribute: .rightMargin, multiplier: 1.0, constant: -8.0),

                    NSLayoutConstraint(item: greenView, attribute: .left, relatedBy: .equal, toItem: view, attribute: .leftMargin, multiplier: 1.0, constant: 8.0),
                    NSLayoutConstraint(item: greenView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 75.0),
                    ])

//you just need to clip the greenview with the right side so you need to make it -8 !