iphone - 当用户重新排列单元格时，如何刷新 UITableView？

Question

我有一个可编辑的 UITableView。当我的用户重新排列单元格时，我希望能够更新表格 View ，因为当我重新排列底部单元格并将其插入中间时，我遇到了一个有趣的情况。它会产生不需要的效果，因为底行是圆形的，而中间行不应该是圆形的。如何防止这种情况发生？

为了实现这种外观，我必须设置每个 UITableViewCell 的 backgroundView。顶部和底部的图像使用与中间的图像不同的图像。

更新:

我不确定是否遗漏了任何案例，因为重新排序时图像仍然困惑。

for (NSIndexPath* visibleIndexPath in tableView.indexPathsForVisibleRows) {
        UITableViewCell* cell = [tableView cellForRowAtIndexPath:visibleIndexPath];

        //Top moving to middle rows
        if (sourceIndexPath.row == 0 && proposedDestinationIndexPath.row != sectionRows - 1) {
            ((UIImageView *)cell.backgroundView).image = [UIImage imageNamed:@"tablemiddle55@2x.png"];
        }
        //Top moving to bottom
        else if (sourceIndexPath.row == 0 && proposedDestinationIndexPath.row == sectionRows - 1) {
            ((UIImageView *)cell.backgroundView).image = [UIImage imageNamed:@"tablebottom55@2x.png"];
        }
        //Top moving to top
        else if (sourceIndexPath.row == 0 && proposedDestinationIndexPath.row == 0) {
            ((UIImageView *)cell.backgroundView).image = [UIImage imageNamed:@"tabletop55@2x.png"];
        }
        //Middle moving to top
        else if (sourceIndexPath.row != 0 && sourceIndexPath.row != sectionRows -1 && proposedDestinationIndexPath.row == 0)
        {
            ((UIImageView *)cell.backgroundView).image = [UIImage imageNamed:@"tabletop55@2x.png"];
        }
        //Middle moving to bottom
        else if (sourceIndexPath.row != 0 && sourceIndexPath.row != sectionRows -1 && proposedDestinationIndexPath.row == sectionRows - 1)
        {
            ((UIImageView *)cell.backgroundView).image = [UIImage imageNamed:@"tablebottom55@2x.png"];
        }
        //Middle moving to middle
        else if (sourceIndexPath.row != 0 && sourceIndexPath.row != sectionRows -1 && 
                 proposedDestinationIndexPath.row != sectionRows -1 && proposedDestinationIndexPath.row !=0)
        {
            ((UIImageView *)cell.backgroundView).image = [UIImage imageNamed:@"tablemiddle55@2x.png"];
        }
        //Bottom moving to top
        else if (sourceIndexPath.row == sectionRows - 1 && proposedDestinationIndexPath.row == 0)
        {
            ((UIImageView *)cell.backgroundView).image = [UIImage imageNamed:@"tabletop@2x.png"];
        }
        //Bottom moving to middle
        else if (sourceIndexPath.row == sectionRows - 1 && proposedDestinationIndexPath.row != 0 && proposedDestinationIndexPath.row != sectionRows - 1)
        {
            ((UIImageView *)cell.backgroundView).image = [UIImage imageNamed:@"tablemiddle@2x.png"];
        }
        //Bottom moving to bottom
        else if (sourceIndexPath.row == sectionRows - 1 && proposedDestinationIndexPath.row == sectionRows - 1)
        {
            ((UIImageView *)cell.backgroundView).image = [UIImage imageNamed:@"tablebottom@2x.png"];
        }
    }

Answer 1

好吧，您只需更改已更改单元格的背景 View ，就像在 tableview:cellForRowAtIndexPath: 中所做的那样。

- (NSIndexPath *)tableView:(UITableView *)tableView targetIndexPathForMoveFromRowAtIndexPath:(NSIndexPath *)sourceIndexPath toProposedIndexPath:(NSIndexPath *)proposedDestinationIndexPath {
   //The rest of your stuff you need to do

   for (NSIndexPath* visibleIndexPath in self.tableView.indexPathsForVisibleRows) {
       UITableViewCell* visibleCell [self.tableView cellForRowAtIndexPath:visibleIndexPath];
       if (visibleIndexPath.row == 0) ((UIImageView *)cell.backgroundView).image = [UIImage imageNamed:@"tabletop55.png"];
       else if (visibleIndexPath.row == [self tableView:tableView numberOfRowsInSection:visibleIndexPath.section) {
           ((UIImageView *)cell.backgroundView).image = [UIImage imageNamed:@"tablebottom55.png"];
       }
       else ((UIImageView *)cell.backgroundView).image = [UIImage imageNamed:@"tablemiddile55.png"];
   }
}