[英]Why is only image in first cell updated while the rest of the cells in uicollectionview not updated. ios swift
我正在尝试在顶部栏中获得3个图标。
import UIKit
class SectionHeader: UICollectionReusableView {
private let telButtonCellId = "TelButtonCell"
private let searchBarCellId = "SearchBarCell"
private let notificationButtonCellId = "NotificationButtonCell"
// MARK: - Properties
@IBOutlet weak var collectionView: UICollectionView!
// MARK: - Initialization
override func awakeFromNib() {
super.awakeFromNib()
self.collectionView.register(UINib(nibName:notificationButtonCellId, bundle: nil), forCellWithReuseIdentifier: notificationButtonCellId)
self.collectionView.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.width*0.2) // this is need to set the size of the collection view
self.collectionView.delegate = self
self.collectionView.dataSource = self
}
extension SectionHeader : UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: notificationButtonCellId, for: indexPath) as! NotificationButtonCell
var image = UIImage(named: "globe")
cell.imageView.image=image?.addImagePaddingShift(x: 20 , y: 20,shiftX: 0, shiftY: 10)
cell.imageView.contentMode = .scaleAspectFit
cell.imageView.bounds=cell.bounds
cell.imageView.center = cell.center;
cell.backgroundColor = UIColor.lightGray
return cell
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let frameWidth = UIScreen.main.bounds.width
let frameHeight = UIScreen.main.bounds.width*0.2
return CGSize(width: frameWidth*0.15, height: frameHeight*1.0)
}
因此,只有第一个单元格才会显示地球。 即使我可以更改背景颜色,其余2个单元格也为空。
imageView是单元格的子视图,如我所见,它必须具有其大小。 因此,需要将其框架(相对于其超级视图坐标系的位置-单元)设置为原点为(0,0)的单元的高度和宽度。 单元的边界提供了这些尺寸,因此答案可以是
cell.imageView.frame = cell.bounds
或更好
cell.imageView.frame = CGRect(x: 0, y: 0, width: cell.frame.width, height: cell.frame.height)
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