Use of unresolved identifier 'view' - ios

Question

Trying to add constraints to a collection view.
Keep getting the error, "Use of unresolved identifier 'view'"
Any help is much appreciated.
import UIKit
class MenuBar: UIView, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {
lazy var collectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
// cv.backgroundColor = UIColor.white
cv.dataSource = self
cv.delegate = self
return cv
}()
let cellId = "cellId"
override init(frame:CGRect) {
super.init(frame: frame)
collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: cellId)
addSubview(self.collectionView)
collectionView.translatesAutoresizingMaskIntoConstraints = false
collectionView.leadingAnchor.constraint(
equalTo: view.leadingAnchor).isActive = true
collectionView.trailingAnchor.constraint(
equalTo: view.trailingAnchor).isActive = true
collectionView.topAnchor.constraint(
equalTo: view.topAnchor,
constant: -20).isActive = true
collectionView.heightAnchor.constraint(
equalTo: view.heightAnchor,
multiplier: 0.10).isActive = true
backgroundColor = UIColor.red
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 2
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath)
cell.backgroundColor = .blue
return cell
}

Answer 1

There is no view property in a UIView, it's a property of UIViewController.
Since self is the view in this case, replace:
equalTo: view.leadingAnchor).isActive = true
with:
equalTo: self.leadingAnchor).isActive = true
and same for other ones.
NSLayoutConstraint.activate([
collectionView.leadingAnchor.constraint(equalTo: self.leadingAnchor),
collectionView.trailingAnchor.constraint(equalTo: self.trailingAnchor),
collectionView.topAnchor.constraint(equalTo: self.topAnchor,constant: -20),
collectionView.heightAnchor.constraint(equalTo: self.heightAnchor,multiplier: 0.10)
)]

Answer 2

You need to replace view with self because this is not viewcontroller this is MenuView so yo need to use self for that:
collectionView.leadingAnchor.constraint(
equalTo: self.leadingAnchor).isActive = true
collectionView.trailingAnchor.constraint(
equalTo: self.trailingAnchor).isActive = true
collectionView.topAnchor.constraint(
equalTo: self.topAnchor,
constant: -20).isActive = true
collectionView.heightAnchor.constraint(
equalTo: self.heightAnchor,
multiplier: 0.10).isActive = true