任何地方都说我想用属性名称（绘图）的核心数据实体杰西卡替换的数据。我想获取二进制数据，并在集合视图中显示imageview（bg）显示二进制数据。我只希望imageview展示属性（绘图）。用户将二进制数据保存在另一个类中。
class rViewController: UIViewController {
fileprivate let collectionView:UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .horizontal
let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
cv.translatesAutoresizingMaskIntoConstraints = false
cv.register(CustomCell.self, forCellWithReuseIdentifier: "cell")
return cv
}()
override func viewDidLoad() {
super.viewDidLoad()
view.addSubview(collectionView)
collectionView.backgroundColor = .white
collectionView.delegate = self
collectionView.dataSource = self
collectionView.topAnchor.constraint(equalTo: view.topAnchor, constant: 40).isActive = true
collectionView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 40).isActive = true
collectionView.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -40).isActive = true
collectionView.heightAnchor.constraint(equalToConstant: view.frame.width/2).isActive = true
}
}
extension rViewController: UICollectionViewDelegateFlowLayout, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: collectionView.frame.width/2.5, height: collectionView.frame.width/2)
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return data.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CustomCell
cell.data = self.data[indexPath.item]
return cell
}
}
class CustomCell: UICollectionViewCell {
var data: CustomData? {
didSet {
guard let data = data else { return }
bg.image = data.backgroundImage
}
}
fileprivate let bg: UIImageView = {
let iv = UIImageView()
iv.translatesAutoresizingMaskIntoConstraints = false
iv.contentMode = .scaleAspectFill
iv.clipsToBounds = true
iv.layer.cornerRadius = 12
return iv
}()
override init(frame: CGRect) {
super.init(frame: .zero)
contentView.addSubview(bg)
bg.topAnchor.constraint(equalTo: contentView.topAnchor).isActive = true
bg.leftAnchor.constraint(equalTo: contentView.leftAnchor).isActive = true
bg.rightAnchor.constraint(equalTo: contentView.rightAnchor).isActive = true
bg.bottomAnchor.constraint(equalTo: contentView.bottomAnchor).isActive = true
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}