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Matthew Ingram
Courses Plus Student 4,718 PointsConfused 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
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

Toby Morgan
iOS Development Techdegree Graduate 23,133 PointsYour height constraint should be toItem: nil
since the height constraint is not relative to anything.