iphone - 如何使 UITableView 可重排？

Question

我正在尝试使我的 UITableView 可编辑，以便您可以四处移动单元格。现在当我点击编辑按钮时，它只允许我删除但不能重新排列。

我有的方法是:

Code:
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    return YES;
}

- (void)setEditing:(BOOL)editing animated:(BOOL)animate
{
    [self.routineTableView setEditing: !self.routineTableView.editing animated:YES];

    if (self.routineTableView.editing)
        [self.navigationItem.leftBarButtonItem setTitle:@"Done"];
    else
        [self.navigationItem.leftBarButtonItem setTitle:@"Edit"];
}

-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
 {
     if (editingStyle == UITableViewCellEditingStyleDelete) 
     {
         NSManagedObjectContext *context = [self.fetchedResultsController managedObjectContext];
         [context deleteObject:[self.fetchedResultsController objectAtIndexPath:indexPath]];
         NSLog(@"fetched results : \n%@\n",[self.fetchedResultsController fetchedObjects]);

         NSError *error = nil;

         if (![managedObjectContext save:&error]) 
         {
             // Handle the error.
         }
    }

- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
    return YES;
}

Answer 1

为了正确地实现重新排序行， TableView 数据源应该实现如下方法:

-(BOOL)tableView:(UITableView *)tableView
canMoveRowAtIndexPath:(NSIndexPath *)indexPath;
-(void)tableView:(UITableView *)tableView
moveRowAtIndexPath:(NSIndexPath *)fromIndexPath
       toIndexPath:(NSIndexPath *)toIndexPath;

及其代表可以实现:

-(NSIndexPath *)tableView:(UITableView *)tableView
targetIndexPathForMoveFromRowAtIndexPath:(NSIndexPath *)sourceIndexPath
                     toProposedIndexPath:(NSIndexPath *)proposedDestinationIndexPath;

还有这个page为您提供代码示例。