问题
Please check this attached code and screen short. It's work fine when I set the color of container view but when I add UIImage in cell then it's not working. I changed the imageview content mode but it's not working.
class ViewController: UIViewController {
@IBOutlet weak var segColumn: UISegmentedControl!
@IBOutlet weak var collectionView: UICollectionView!
fileprivate var items: [UIImage] = [ // My images ]
override func viewDidLoad() {
super.viewDidLoad()
self.setup()
}
}
extension ViewController: UICollectionViewDataSource{
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return items.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell
cell.imgCell.image = items[indexPath.row]
cell.imgCell.contentMode = .scaleAspectFill
cell.contentView.backgroundColor = .red
return cell
}
}
extension ViewController: UICollectionViewDelegateFlowLayout{
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: (collectionView.bounds.width/3 - 2), height: (collectionView.bounds.width/3))
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 2
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 2
}
}
回答1:
Please try this solution. I think there are some changes from Xcode 11. Change the CollectionView Estimate Size to None then it will work.
回答2:
it is probably because the red is dominating over the image
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell
cell.imgCell.image = items[indexPath.row]
cell.imgCell.contentMode = .scaleAspectFill
cell.contentView.backgroundColor = .red
return cell
}
try:
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell
cell.contentView.backgroundColor = .red
cell.imgCell.image = items[indexPath.row]
cell.imgCell.contentMode = .scaleAspectFill
return cell
}
来源：https://stackoverflow.com/questions/59181037/uicollectionviewlayout-not-working-with-uiimage-in-swift-5-and-xcode-11