给cell添加即将显示动画

(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{

   NSArray *array =  tableView.indexPathsForVisibleRows;

   NSIndexPath *firstIndexPath = array[0];

   //设置anchorPoint

   cell.layer.anchorPoint = CGPointMake(0, 0.5);

   //为了防止cell视图移动，重新把cell放回原来的位置

   cell.layer.position = CGPointMake(0, cell.layer.position.y);

   //设置cell 按照z轴旋转90度，注意是弧度

   if (firstIndexPath.row < indexPath.row) {

           cell.layer.transform = CATransform3DMakeRotation(M_PI_2, 0, 0, 1.0);

   }else{

       cell.layer.transform = CATransform3DMakeRotation(- M_PI_2, 0, 0, 1.0);

   }

   cell.alpha = 0.0;

   [UIView animateWithDuration:1 animations:^{

       cell.layer.transform = CATransform3DIdentity;

       cell.alpha = 1.0;

   }];

}

- (void)collectionView:(UICollectionView *)collectionView willDisplayCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath{

   if (indexPath.row % 2 != 0) {

       cell.transform = CGAffineTransformTranslate(cell.transform, kScreenWidth/2, 0);

   }else{

       cell.transform = CGAffineTransformTranslate(cell.transform, -kScreenWidth/2, 0);

   }

   cell.alpha = 0.0;

   [UIView animateWithDuration:0.7 animations:^{

       cell.transform = CGAffineTransformIdentity;

       cell.alpha = 1.0;

   } completion:^(BOOL finished) {

   }];

}