UICollectionViewFlowLayoutAutomaticSize EXC_BAD_ACCESS

Question

I have a collection view and for some cells I want to return a specific height, and some others, I want to fall back to automatic size. Here is my code:

-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{
    if(something){
        return UICollectionViewFlowLayoutAutomaticSize;
    }else{
        return some CGSize
    }
}

However, I get EXC_BAD_ACCESS error when I try to return UICollectionViewFlowLayoutAutomaticSize. I've also tried to set the size to automatic dimension on flow layout itself:

UICollectionViewFlowLayout* layout = (UICollectionViewFlowLayout*)self.collectionViewLayout;
layout.itemSize = UICollectionViewFlowLayoutAutomaticSize;

I'm also getting the same error when I assign to UICollectionViewFlowLayoutAutomaticSize either.

What am I doing wrong?

Answer 1

不确定这是否与您的问题有关，但我还有一个EXC_BAD_ACCESS，其中包含一个带有流程布局的集合视图。结果更改.estimatedItemSize修复了问题：

let flowLayout = collectionView.collectionViewLayout as! UICollectionViewFlowLayout

// this breaks
flowLayout.estimatedItemSize = CGSize(width: 100, height: 100)

// this does not break
flowLayout.estimatedItemSize = CGSize(width: 1, height: 1)

我的细胞只有一个标签，所以它们小于100x100。我想如果你给出的估计尺寸大于实际尺寸就不好......

希望这有助于任何人。