How do you add constraints to a label in a UICollectionView header? - swift

Question

I have a label that I cant add constraints to because it is in a Collection Reusable View, which doesn't have a viewDidLoad method. Is it possible to constrain the header so it is always 15 px from the left?
I tried adding constraints normally, but again, the Reusable View doesnt have a view for some reason. The other solutions I looked at all use a view of sorts.
override func layoutSubviews() {
super.layoutSubviews()
headerTitle.translatesAutoresizingMaskIntoConstraints = false
headerTitle.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 15).isActive = true
headerTitle.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
headerTitle.topAnchor.constraint(equalTo: view.topAnchor, constant: 40).isActive = true
headerTitle.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
headerTitle.frame = bounds
}
This code throws the error Cannot find 'view' in scope which im assuming is a Reusable View thing rather than a non existent view. Here is the rest of my code:
class HeaderCollectionReusableView: UICollectionReusableView {
static let identifier = "homeheader"
private let headerTitle = UILabel()
private let newDataSet = UIButton()
override init(frame: CGRect) {
super.init(frame:frame)
headerTitle.text = "AppTitle"
headerTitle.font = UIFont.systemFont(ofSize: 32.0, weight: .bold)
headerTitle.textAlignment = .left
headerTitle.numberOfLines = 0
addSubview(headerTitle)
}
required init?(coder: NSCoder) {
fatalError()
}
override func layoutSubviews() {
super.layoutSubviews()
headerTitle.frame = bounds //<-- want to replace this line with the constraints
}
}
I'm hoping the solution works with buttons too. This is my desired output:
desired output from constraints

Answer 1

You are trying to put constraints on a label but you don't have a parent view of that label. Constraints need some view to hold onto in order to be functional.