UILabel doesn't always show up in its superview - ios

Question

I'm trying to create a stack view with nested stack views of views to create a grid. Every cell in a grid should have a label. The problem I have is that label is showing only in the very first view as in this screenshot:
Code of my main stack view is straightforward:
for _ in 1...5 {
let view = WeekView()
addArrangedSubview(view)
}
And this is the code of a nested stack view.
// Function called in init(frame:)
func configureView() {
spacing = 8
for _ in 1...7 {
let view = UIView()
let label = UILabel()
view.addSubview(label)
addArrangedSubview(view)
label.text = "hi"
label.textAlignment = .center
view.widthAnchor.constraint(equalToConstant: 40).isActive = true
view.translatesAutoresizingMaskIntoConstraints = false
label.heightAnchor.constraint(equalTo: view.heightAnchor).isActive = true
label.widthAnchor.constraint(equalTo: view.widthAnchor).isActive = true
label.translatesAutoresizingMaskIntoConstraints = false
}
}
Any suggestions will be much appriciated.

Answer 1

You are not setting the position for the label. You could add the horizontal and vertical constraints, but you can also simply do:
label.translatesAutoresizingMaskIntoConstraints = true
label.frame = view.bounds
label.autoresizingMask = [.flexibleWidth, .flexibleHeight]
instead of
label.heightAnchor.constraint(equalTo: view.heightAnchor).isActive = true
label.widthAnchor.constraint(equalTo: view.widthAnchor).isActive = true
label.translatesAutoresizingMaskIntoConstraints = false

Answer 2

The problem might be that you haven't set
label.translatesAutoresizingMaskIntoConstraints = false
Please try to set that directly after you create the UI element:
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(label)
...
view.widthAnchor.constraint(equalToConstant: 40).isActive = true
view.heightAnchor.constraint(equalToConstant: 40).isActive = true
Yet, in your case I would highly recommend using a UICollectionView. You get a lot of things for free if you use it (including smooth horizontal scrolling).
The image looks like you are building some kind of calendar app. If you use a UICollectionView you also get a very flexible API for spacing and overall layout.