objective-c - 单击按钮时如何传递对象

Question

我有一个带有按钮的自定义表格视图单元格。单击按钮时，我需要传递 tablview 的 NSIndexPath 对象。我能做的是将标签分配给按钮，使用发件人接收标签..但我想传递 NSIndexPath 对象...下面是代码。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
   static NSString *CellIdentifier = @"shortCodeCell";
   IPadTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
   if (cell == nil)
   {
        NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"KeywordsCell"     owner:nil options:nil];

        for (id currentObject in topLevelObjects)
        {   
            if ([currentObject isKindOfClass:[IPadTableViewCell class]])
            {
                cell = (IPadTableViewCell  *)currentObject;
            }
        }
    }
    // Delete
    [cell.btnDelete addTarget:self action:@selector(onDelete:) forControlEvents:UIControlEventTouchUpInside];

    cell.btnDelete.tag=indexPath.row;

    return cell;
}

-(void)onDelete:(id)sender
{   
     UIButton *btn=(UIButton *)sender;
     NSLog(@"BtnIndexpath to be deleted:%d",btn.tag);
     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{
     int errorCode = 0;
     kd = [items objectAtIndex:btn.tag];
     BOOL isDeleteKeyword= [ServerAPI deleteKeywordWithId:kd.keywordId :&errorCode];
     dispatch_async (dispatch_get_main_queue (),
                    ^{
                        if (isDeleteKeyword) {
                            [items removeObjectAtIndex:btn.tag];
                            //[tblKeywords deleteRowsAtIndexPaths:[NSArray arrayWithObject:btnIndexPath] withRowAnimation:YES];
                            [self.tblKeywords reloadData];
                        }
                        else return;
                    });
    });
}

Answer 1

您可以在“cellForRowAtIndexPath”中设置以下内容

cell.tag = indexPath.section; 
cell.btnDelete.tag=indexPath.row;

在“onDelete”中，您可以根据分配的标签创建 indexPath。

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:[sender tag] inSection:[[sender superview] tag]]

Answer 2

// I assume your UITableView called tableView
// Using this way you don't need to use tag
-(void)onDelete:(id)sender
{
    UITableViewCell *cell = (UITableViewCell *)[sender superview];
    NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
}