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Start your free trialSheng Wei
4,382 Points[Help!] Whats wrong with my constraints?
Hi, I would appreciate if someone could point out what the error is in my syntax for constraints. Thanks.
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
func setUpsampleViewConstraints() {
sampleView.translatesAutoresizingMaskIntoConstraints = false
let sampleViewHeightConstraint = NSLayoutConstraint(item: sampleView, attribute: .Bottom, relatedBy: .Equal,
toItem: nil, attribute: .CenterX, multiplier: 1.0, constant: 50.0)
let sampleViewWidthConstraint = NSLayoutConstraint(item: sampleView, attribute: .Bottom, relatedBy: .Equal,
toItem: nil, attribute: .CenterX, multiplier: 1.0, constant: 50.0)
view.addConstraints([
sampleViewHeightConstraint,
sampleViewWidthConstraint])
}
}
3 Answers
Craig Salmond
Courses Plus Student 7,438 PointsThe second attribute
s for sampleViewHeightConstraint
and sampleViewWidthConstraint
needs to be .NotAnAttribute
, not .CenterX
. Also you don't have the a constraint to vertically center the sampleView.
Greg Kaleka
39,021 PointsHi Sheng,
You're missing a closing curly brace on your setUpsampleViewConstraints function. I think you also need to center the view vertically, per the instructions. Hopefully this is enough to get you through.
Cheers
-Greg
Sheng Wei
4,382 PointsHi Greg,
This is my new code as per your advice:
func setUpsampleViewConstraints() {
sampleView.translatesAutoresizingMaskIntoConstraints = false
}
let sampleViewHeightConstraint = NSLayoutConstraint(item: sampleView, attribute: .Height, relatedBy: .Equal,
toItem: nil, attribute: .CenterX, multiplier: 1.0, constant: 50.0)
let sampleViewWidthConstraint = NSLayoutConstraint(item: sampleView, attribute: .Width, relatedBy: .Equal,
toItem: nil, attribute: .CenterX, multiplier: 1.0, constant: 50.0)
let sampleViewCenterXConstraint = NSLayoutConstraint(item: sampleView, attribute: .CenterX, relatedBy: .Equal,
toItem: nil, attribute: .CenterX, multiplier: 1.0, constant: 0.0)
view.addConstraints([
sampleViewHeightConstraint,
sampleViewWidthConstraint,
sampleViewCenterXConstraint
])
The Bummer! I keep getting is: Don't forget to add the constraints to the parent view!
Not sure what's missing here :/