ios - UICollectionViewCell 翻转并在点击时增长

Question

如何实现带有翻转和增长以在点击时显示模态视图的 UICollectionViewCell 的动画？

Answer 1

这是我在另一个项目中使用的，效果很好:

- (BOOL)collectionView:(UICollectionView *)collectionView shouldSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
    if (cell.selected) {
        [collectionView deselectItemAtIndexPath:indexPath animated:YES];
        [UIView transitionWithView:cell
                          duration:0.2
                           options:UIViewAnimationOptionTransitionFlipFromLeft
                        animations:^{
                            [cell setFrame:self.selectedCellDefaultFrame];
                            cell.transform = self.selectedCellDefaultTransform;
                        }
                        completion:^(BOOL finished) {
                            self.selectedCellDefaultFrame = CGRectZero;
                            [collectionView reloadItemsAtIndexPaths:@[indexPath]];
                        }];
        return NO;
    }
    else {
        return YES;
    }
}
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
    [cell.superview bringSubviewToFront:cell];
    self.selectedCellDefaultFrame = cell.frame;
    self.selectedCellDefaultTransform = cell.transform;
    [UIView transitionWithView:cell
                      duration:0.2
                       options:UIViewAnimationOptionTransitionFlipFromRight
                    animations:^{
                        [cell setFrame:collectionView.bounds];
                        cell.transform = CGAffineTransformMakeRotation(0.0);
                    }
                    completion:^(BOOL finished) {}];
}

这里有不同的东西:

• bringSubviewToFront: 消息调用用于防止单元格在其他单元格后面设置动画
• 我们使用在 Controller 中声明的两个属性:selectedCellDefaultFrame 和 selectedCellDefaultTransform 来保存单元格的默认状态并在取消选择时重新初始化它
• 取消选择时，我们调用UICollectionView的reloadItemsAtIndexPaths:方法来确保位置的重置完全完成

如果您对此有任何问题，请告诉我。

祝你好运