ios - Collection View 单元动画 tvOS

Question

我正在尝试为 Collection View 单元格设置动画，这是我目前的代码

- (void)collectionView:(UICollectionView *)collectionView didUpdateFocusInContext:(UICollectionViewFocusUpdateContext *)context withAnimationCoordinator:(UIFocusAnimationCoordinator *)coordinator{

    UICollectionViewCell *nextFocusedCell = [collectionView dequeueReusableCellWithReuseIdentifier:@"VideoCell" forIndexPath:context.nextFocusedIndexPath];
    UICollectionViewCell *previousFocusedCell = [collectionView dequeueReusableCellWithReuseIdentifier:@"VideoCell" forIndexPath:context.previouslyFocusedIndexPath];
    if (context.nextFocusedView) {
        [coordinator addCoordinatedAnimations:^{
            [nextFocusedCell setFrame: CGRectMake(3, 14, 300, 300)];
        } completion:^{
            // completion
        }];
    } else if (context.previouslyFocusedView) {
        [coordinator addCoordinatedAnimations:^{
            [previousFocusedCell setFrame: CGRectMake(3, 14, 100, 100)];
        } completion:^{
            // completion
        }];
    }

但是我的代码不工作。我已经阅读了文档，它说要实现类似的东西 if (self == contextFocusedView)......但是它有一个警告说不兼容的指针 View Controller 到 UIView。有人可以告诉我我的代码有什么问题以及如何修复它吗？谢谢!!

Answer 1

dequeueReusableCellWithReuseIdentifier: 不会返回当前 View ，而是返回一个新 View 。 尝试使用 cellForItemAtIndexPath:

但为什么不使用:

if (context.nextFocusedView) {
    [coordinator addCoordinatedAnimations:^{
        context.nextFocusedView.transform = CGAffineTransformMakeScale(1.1, 1.1);
    } completion:nil];
}
if (context.previouslyFocusedView) {
    [coordinator addCoordinatedAnimations:^{
        context.previouslyFocusedView.transform = CGAffineTransformMakeScale(1.0, 1.0);
    } completion:nil];
}