iphone - 如何防止 UITableViewCell 被移离它自己的部分？

Question

我的 UITableView 有 3 个部分。只有第二部分的单元格是可移动的:

- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
    BOOL canMove = NO;
    if (indexPath.section == 1) {
        canMove = YES;
    }
    return canMove;
}

但是，第二部分(最初包含 A``B``C 单元格)中的单元格 (B) 可以移动到第一部分(最初包含仅 T 单元格):

〉

如何确保单元格在其自己的部分内移动？

Answer 1

我想这会解决你的问题

- (NSIndexPath *)tableView:(UITableView *)tableView targetIndexPathForMoveFromRowAtIndexPath:(NSIndexPath *)sourceIndexPath toProposedIndexPath:(NSIndexPath *)proposedDestinationIndexPath
{
    if( sourceIndexPath.section != proposedDestinationIndexPath.section )
        return sourceIndexPath;
    else
        return proposedDestinationIndexPath;
}

来自苹果 documentation

This method allows customization of the target row for a particular row as it is being moved up and down a table view. As the dragged row hovers over a another row, the destination row slides downward to visually make room for the relocation; this is the location identified by proposedDestinationIndexPath.