3

I have created a customlayout and set my cells position attribute in layoutAttributesForItemAtIndexPath like this

attributes.center = CGPointMake((size.width/2 - 100) + 100, (size.height/2 - 150) +100);

I would like to animate a cell when it is selected. replicating the kind of animations we get with the initialLayoutAttributesForAppearingItemAtIndexPath & finalLayoutAttributesForDisappearingItemAtIndexPath.

I'd like to do this when a cell is selected and de-selected.

so for instance:

Cell A is in position 0,0. Cell B is in position 50,100. If I select cell B I'd like to animate it to 0,0. and at the same time animate cell A to 50,100. basically switching positions, but animated.

4

2 回答 2

1

也许是不同的方法。只需覆盖 collectionViewCell 中的 isSelected 即可。

 override var isHighlighted: Bool {
    didSet {
        if isHighlighted {
            UIView.animate(withDuration: 0.2, delay: 0, options: .curveEaseOut, animations: {
                // animate highlight
            }, completion: nil)
        } else {
            UIView.animate(withDuration: 0.2, delay: 0, options: .curveEaseOut, animations: {
                // animate unHighligh
            }, completion: nil)
        }
    }
}

在这篇文章UICollectionView: Animate cell size change on selection中，您可以看到有关如何为大小更改设置动画的示例。

于 2017-09-05T10:25:58.437 回答
0

我在 UICollectionViewDelegate 中使用 didSelectItemAtIndexPath 为属性设置动画：

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    [_collectionView.collectionViewLayout invalidateLayout];
    UICollectionViewLayoutAttributes *newAttributes = [_collectionView layoutAttributesForItemAtIndexPath:indexPath];

    //use new attributes for animation
}
于 2012-10-25T11:47:23.723 回答