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我想爲我的UICollectionView中的每個單元具有不同的高度。所以我重寫GetSizeForItem方法在UICollectionViewDelegateFlowLayout這樣的:GetSizeForItem不觸發
public class MyCollectionViewDelegateFlowLayout : UICollectionViewDelegateFlowLayout
{
public override CGSize GetSizeForItem(UICollectionView collectionView, UICollectionViewLayout layout, NSIndexPath indexPath)
{
// TODO custom height logic
return new SizeF(100, 100);
}
}
這是我如何創建UICollectionView並使用自定義的委託類:
var flowLayout = new UICollectionViewFlowLayout()
{
ItemSize = new SizeF(320, 80),
ScrollDirection = UICollectionViewScrollDirection.Vertical,
MinimumLineSpacing = 0,
MinimumInteritemSpacing = 0,
SectionInset = new UIEdgeInsets(UIScreen.MainScreen.ApplicationFrame.Height - 100, 0, 0, 0)
};
var collectionView = new UICollectionView(UIScreen.MainScreen.ApplicationFrame, flowLayout);
collectionView.Delegate = new MyCollectionViewDelegateFlowLayout();
collectionView.RegisterNibForCell(MyCollectionCell.Nib, MyCollectionCell.Key);
var source = new MvxCollectionViewSource(collectionView, MyCollectionCell.Key);
collectionView.Source = source;
的問題是,GetSizeForItem方法永遠不會觸發。任何想法如何解決這個問題?