我正在使用 collectionview 全屏显示图像并允许在不同图像之间滚动。但是当方向改变时，它显示不正确。 
.这是我的代码
override func willRotate(to toInterfaceOrientation: UIInterfaceOrientation, duration: TimeInterval) {
// collectionView.reloadData()
collectionView.collectionViewLayout.invalidateLayout()
if visibleCell != nil {
collectionView.selectItem(at: visibleCell as IndexPath?, animated: true, scrollPosition: .centeredHorizontally)
}
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return images.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ImageCell", for: indexPath) as! ImageCollectionViewCell
print(cell.frame)
cell.SectionImage.image = images[indexPath.row].image
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: self.view.frame.width, height: self.view.frame.height)
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
最佳答案
使用 UICollectionView sizeForItemAtIndexPath 方法定义单元格的高度和宽度。
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
let leftAndRightPaddings: CGFloat = 15.0
let numberOfItemsPerRow: CGFloat = CGFloat(NUMBER_OF_ITEMS_PER_ROW)
let bounds = UIScreen.mainScreen().bounds
let width = (bounds.size.width - leftAndRightPaddings * (numberOfItemsPerRow+1)) / numberOfItemsPerRow
let layout = collectionView.collectionViewLayout as! UICollectionViewFlowLayout
layout.itemSize = CGSizeMake(width, width)
return layout.itemSize
}
尝试一下。您将获得预期的结果。
关于ios - 如何设置collectionview swift单元格的位置？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42553042/