ios – UICollectionViewCell可以轻松地翻转并增长

我如何实现一个UICollectionViewCell的动画,随着翻转和成长,可以轻松显示模态视图？

解决方法

这是我在另一个项目中使用的,它运行良好：

- (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) {}];
}

不同的东西在这里：

> bringSubviewToFront：消息调用用于防止单元格在其他单元格之后动画化
>我们使用控制器中声明的两个属性：selectedCellDefaultFrameand selectedCellDefaultTransform来保存单元格的默认状态,并在取消选择时重新初始化
>当取消选择时,我们调用UICollectionView的reloadItemsAtIndexPaths：方法来确保位置的重置完全完成

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祝你好运,