为什么图像未加载到自定义集合视图单元格中？代码如下：
''' 导入UIKit
ViewController类：UIViewController，UICollectionViewDataSource，UICollectionViewDelegate {
var collectionView: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
let flowLayout = UICollectionViewFlowLayout()
collectionView = UICollectionView.init(frame: view.bounds, collectionViewLayout: flowLayout)
collectionView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
collectionView.backgroundColor = .gray
collectionView.alwaysBounceVertical = true
view.addSubview(collectionView)
collectionView.register(CollectionViewCell.self, forCellWithReuseIdentifier: "Cell")
collectionView.dataSource = self
collectionView.delegate = self
}
//MARK: CollectionView Data soure
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 10
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! CollectionViewCell
cell.imageView.image = #imageLiteral(resourceName: "person1")
return cell
}
}
'''
''' 导入UIKit
CollectionViewCell类：UICollectionViewCell {
let bgView = UIView()
let imageView = UIImageView()
override init(frame: CGRect) {
super.init(frame: frame)
self.clipsToBounds = true
self.autoresizesSubviews = true
self.backgroundColor = UIColor.blue
self.layer.cornerRadius = 12
bgView.frame = self.bounds
bgView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
bgView.backgroundColor = #colorLiteral(red: 0.9607843161, green: 0.7058823705, blue: 0.200000003, alpha: 1)
//self.addSubview(bgView)，所有的View都有backgroundView属性，这个比addSubview更好
self.backgroundView = bgView
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.backgroundColor = #colorLiteral(red: 1.0, green: 1.0, blue: 1.0, alpha: 1.0)
imageView.layer.cornerRadius = 12
imageView.layer.borderWidth = 6
imageView.layer.borderColor = #colorLiteral(red: 0.8078431487, green: 0.02745098062, blue: 0.3333333433, alpha: 1)
imageView.clipsToBounds = true
self.addSubview(imageView)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
'''