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[英]Why aren't my videos showing in cells in my scroll view with AVPlayer
[英]Why aren't my collection view cells showing…?
自从我以编程方式创建集合视图以来已经有一段时间了,我似乎找不到为什么我的单元格没有显示的原因。 正在设置委托和数据源。 正在设置尺寸,并且尺寸不太大。
class ViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
let cellId = "cellId"
override func viewDidLoad() {
super.viewDidLoad()
setupCV()
}
var containerCollectionView: UICollectionView = {
let layout = UICollectionViewLayout()
let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
cv.backgroundColor = UIColor.white
return cv
}()
}
extension ViewController {
fileprivate func setupCV() {
// these first two lines add the colelction view and apply constraints - they work and the CV is properly displayed inside the view controller
self.view.addSubview(containerCollectionView)
containerCollectionView.anchor(view.topAnchor, left: view.leftAnchor, bottom: view.bottomAnchor, right: view.rightAnchor, topConstant: 0, leftConstant: 0, bottomConstant: 0, rightConstant: 0, widthConstant: 0, heightConstant: 0)
containerCollectionView.delegate = self
containerCollectionView.dataSource = self
containerCollectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: cellId)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 150, height: 150)
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath)
cell.backgroundColor = UIColor.yellow
return cell
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
}
您正在初始化错误的布局。
尝试这个:
let layout = UICollectionViewFlowLayout()
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