Question

如何实现动画，其中UICollectionViewCell具有翻转和增长以显示模态视图？

Answer 1

这是我在另一个项目中使用的，它运作良好：

- (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) {}];
}

这里有不同的事情：

bringSubviewToFront:消息调用用于阻止单元格在其他单元格后面设置动画
我们使用控制器中声明的两个属性：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
取消选择时，我们调用reloadItemsAtIndexPaths:的{{1}}方法以确保该位置的重置完全

如果您对此有任何疑问，请告诉我。

祝你好运，

Answer 2

我没有尝试过成长动画，但我想我可以帮助使用UICollectionViewCell翻转动画。

尝试：

UICollectionViewCell* cell = [collectionView cellForItemAtIndexPath:indexPath];

[UIView animateWithDuration:1.0
                      delay:0
                    options:(UIViewAnimationOptionAllowUserInteraction)
                 animations:^
                {
                     NSLog(@"starting animation");

                    [UIView transitionFromView:cell.contentView
                                        toView:newView
                                      duration:.5
                                       options:UIViewAnimationOptionTransitionFlipFromRight
                                    completion:nil];
                }
                 completion:^(BOOL finished)
                {
                     NSLog(@"animation end");
                }
 ];

希望有所帮助！

UICollectionViewCell可以轻松翻转和增长

2 个答案: