Swift 4 - Multiple inheritance from classes 'NSObject' and 'UICollectionViewFlowLayout' - swift

Question

I am trying to programatically size the collection cell to be the width of the frame, however, the cell size doesn't change when I run the app. Is this the right function to call for Swift 4 and Xcode 9?
import UIKit
class SettingsLauncher: NSObject, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewFlowLayout {
let blackView = UIView()
let collectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
cv.backgroundColor = UIColor.white
return cv
}()
let cellID = "cell"
#objc func showMenu() {
// Show menu
if let window = UIApplication.shared.keyWindow { // Get the size of the entire window
blackView.backgroundColor = UIColor(white: 0, alpha: 0.5)
let height: CGFloat = 200
let y = window.frame.height - height // The y value to appear at the bottom of the screen
collectionView.frame = CGRect(x: 0, y: window.frame.height, width: window.frame.width, height: height)
// Add gesture recognizer on black view to dismiss menu
blackView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleDismiss)))
window.addSubview(blackView)
window.addSubview(collectionView)
blackView.frame = window.frame
blackView.alpha = 0
// Slow the animation down towards the end (curveEasOut)
UIView.animate(withDuration: 1, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
// Animate black view
self.blackView.alpha = 1
// Animate collection view
self.collectionView.frame = CGRect(x: 0, y: y, width: self.collectionView.frame.width, height: height)
}, completion: nil)
}
}
#objc func handleDismiss() {
// Dimisses menu view
UIView.animate(withDuration: 0.5) {
self.blackView.alpha = 0
if let window = UIApplication.shared.keyWindow {
self.collectionView.frame = CGRect(x: 0, y: window.frame.height, width: self.collectionView.frame.width, height: self.collectionView.frame.height)
}
}
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 6
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellID, for: indexPath)
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: collectionView.frame.width, height: 50)
}
override init() {
super.init()
collectionView.delegate = self
collectionView.dataSource = self
collectionView.register(MenuCell.self, forCellWithReuseIdentifier: cellID)
}
}
Edit:
This table view is being animated from the bottom of the page and presents a collection view, which is being called from the view controller that is using the pop up menu.
I now get the error:
Multiple inheritance from classes 'NSObject' and 'UICollectionViewFlowLayout'

Answer 1

UICollectionViewFlowLayout is not a protocol, it's a class. You need to use UICollectionViewDelegateFlowLayout instead of UICollectionViewFlowLayout.
Change
class SettingsLauncher: NSObject, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewFlowLayout
to
class SettingsLauncher: NSObject, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout