我在CollectionViewCell中有一个CollectionView,还有一个单独的NSObject,它是数据源。我可以为外部collectionView设置数据源,但不能为内部setView设置数据源。
这里是包含内部collectionView的单元格:
class FeaturedCell: UICollectionViewCell, UICollectionViewDelegate {
@IBOutlet var collectionView: UICollectionView!
let data = FeaturedData()
override init(frame: CGRect) {
super.init(frame: frame)
//setUp()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
}
func setUp() {
collectionView.dataSource = data
collectionView.delegate = self
collectionView.reloadData()
}
}
extension FeaturedCell {
func setCollectionViewDataSourceDelegate <D: FeaturedData> (_ dataSourceDelegate: D, forRow row: Int) {
collectionView.delegate = dataSourceDelegate
collectionView.dataSource = dataSourceDelegate
collectionView.reloadData()
print("Reload Data")
}
}
以及包含外部collectionView的UIView:
class MainView: UIView, UICollectionViewDelegate {
@IBOutlet var collectionView: UICollectionView!
let data = MainData()
override func awakeFromNib() {
setUp()
}
func setUp() {
collectionView.dataSource = data
collectionView.delegate = self
collectionView.backgroundColor = UIColor.orange
collectionView.collectionViewLayout = createLayout()
collectionView.isPagingEnabled = true
collectionView.bounces = false
collectionView.allowsSelection = true
}
func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
print("WillDisplay")
guard let cell: FeaturedCell = collectionView.dequeueReusableCell(withReuseIdentifier: "FeaturedCell", for: indexPath) as? FeaturedCell else {
fatalError("Unable to dequeue FeaturedCell.")
}
cell.setCollectionViewDataSourceDelegate(featuredData, forRow: indexPath.item)
}
}
这两种方法都被调用,但是从未设置数据源和委托。我也完全按照this教程进行操作(即使使用tableView,也是如此),它仍然不会设置数据源或委托。我究竟做错了什么?
我认为这会有所帮助
class FeaturedCell: UICollectionViewCell {
@IBOutlet var collectionView: UICollectionView!
override init(frame: CGRect) {
super.init(frame: frame)
}
required init?(coder: NSCoder) {
super.init(coder: coder)
}
}
extension FeaturedCell {
func setCollectionViewDataSourceDelegate <T: UICollectionViewDelegate , D: FeaturedData> (delegate: T dataSource: D, forRow row: Int) {
collectionView.delegate = delegate
collectionView.dataSource = dataSource
collectionView.reloadData()
print("Reload Data")
}
}
和在MainView中
func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
print("WillDisplay")
guard let cell: FeaturedCell = collectionView.dequeueReusableCell(withReuseIdentifier: "FeaturedCell", for: indexPath) as? FeaturedCell else {
fatalError("Unable to dequeue FeaturedCell.")
}
cell.setCollectionViewDataSourceDelegate(self, featuredData, forRow: indexPath.item)
}
对于本教程,您按照本教程的Github link进行操作,将您的代码与此进行比较,看看您错过了哪里。
希望这会有所帮助。