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将分页工具条由collectionView更换为scrollView;
由于 cell 的重用/缓存池机制, 当两个 cell 切换位置过远, 超过一屏时, oldCell不显示在当前屏幕, 会进入缓存池, 取到的值是 nil, 需要特殊处理来让我们准确取到这个 cell.