在UIView中调整CollectionViewCell的大小

Question

我在UIView中有CollectionView。如何调整CollectionViewCell屏幕宽度的50% ?我想在CollectionView中创建2列。

class Class_MyUIViewClass: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate 
{

我也有图像和标签在CollectionViewCell.

Answer 1

您可以使用UICollectionView的sizeForItemAt方法来管理它的单元格大小

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    let screenWidth = UIScreen.main.fixedCoordinateSpace.bounds.width
    return CGSize(width: screenWidth/2, height: yourHeight)
} 

也向UICollectionViewDelegateFlowLayout确认

Answer 2

假设您知道所需的单元格高度，请遵循UICollectionViewDelegateFlowLayout:

class Class_MyUIViewClass: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {

并实现sizeForItemAtIndexPath:

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
    let desirednumberOfCollumns: CGFloat = 2
    let width = collectionView.frame.width / desirednumberOfCollumns
    return CGSize(width, yourHeight)
}