UICollectionViewController Error in Swift 3.0: must be initialized with a non-nil layout parameter

Question

I\'m new to iOS development. I\'ve been learning Swift, and today, I tried using UICollectionViewController.

My code is as follows:

 class ViewContro         


        

Answer 1

You can set your code like this:

class ViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {

    let cellId = "Cell"

    lazy var collectionView: UICollectionView = {
        let layout = UICollectionViewFlowLayout()
        // ... layout parameters
        let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
        cv.backgroundColor = .white
        cv.delegate = self
        cv.dataSource = self
        return cv
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        view.addSubview(collectionView)
        // ... add your auto layout constraints to the collection view
        collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: cellId)
    }

    // Delegate and Data Source Methods...

}