FWCollectionViewItemsVerticalAlignment

NS_ENUM(NSInteger, FWCollectionViewItemsVerticalAlignment) {
    FWCollectionViewItemsVerticalAlignmentCenter, /**< 竖直方向居中 */
    FWCollectionViewItemsVerticalAlignmentTop,    /**< 竖直方向顶部对齐 */
    FWCollectionViewItemsVerticalAlignmentBottom  /**< 竖直方向底部对齐 */
}