Objective C - 仅从superview中删除UIButtons

时间:2015-04-25 15:42:07

标签: ios objective-c uibutton shinobi

我对objective-c相当新,我遇到了一个我很难解决的问题..

我正在使用ShinobiDataGrid并使用他们的prepareCellForDisplay。

要显示文本,我会这样做:

if([cell.coordinate.column.title isEqualToString:@"Task"]){
            textCell.textField.textAlignment = NSTextAlignmentLeft;
            textCell.textField.text = cellDataObj.task;
        }

但是对于特定的单元格,我正在尝试添加自定义按钮:

if([cell.coordinate.column.title isEqualToString:@"selected"]){


            UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
            button.frame = CGRectMake(0, 10 , 32, 32);



            if(cellDataObj.selected){

                [button setImage:[UIImage imageNamed:@"checked-box.png"] forState:UIControlStateNormal];

            }else{

                [button setImage:[UIImage imageNamed:@"unchecked-box.png"] forState:UIControlStateNormal];

            }

            button.tag = cell.coordinate.row.rowIndex;
            [button addTarget:self action:@selector(CheckBoxPressed:) forControlEvents:UIControlEventTouchUpInside];

            [cell addSubview:button];

            [button removeFromSuperview];

        }

我首先运行应用程序,出现复选框。但是当我重新加载我的ShinobiDataGrid时,复选框再次出现。我尝试从超级视图中删除按钮,但这不起作用......有什么建议吗?当我第三次重新加载我的ShinobiDataGrid时,复选框第三次没有出现,只是在我第二次重新加载ShinobiDataGrid时添加了另一个。这是整个方法:

- (void)shinobiDataGrid:(ShinobiDataGrid *)grid prepareCellForDisplay:(SDataGridCell *)cell
{

    SDataGridTextCell* textCell = (SDataGridTextCell*)cell;

    CellData *cellDataObj = [cellHolderDisplay objectAtIndex:cell.coordinate.row.rowIndex];

    textCell.textField.textAlignment = NSTextAlignmentCenter;

    if([cell.coordinate.column.title isEqualToString:@"selected"]){


        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
        button.frame = CGRectMake(0, 10 , 32, 32);



        if(cellDataObj.selected){

            [button setImage:[UIImage imageNamed:@"checked-box.png"] forState:UIControlStateNormal];

        }else{

            [button setImage:[UIImage imageNamed:@"unchecked-box.png"] forState:UIControlStateNormal];

        }

        button.tag = cell.coordinate.row.rowIndex;
        [button addTarget:self action:@selector(CheckBoxPressed:) forControlEvents:UIControlEventTouchUpInside];

        [cell addSubview:button];

        [button removeFromSuperview];

    }


    if([cell.coordinate.column.title isEqualToString:@"Task"]){
        textCell.textField.textAlignment = NSTextAlignmentLeft;
        textCell.textField.text = cellDataObj.task;
    }

    if([cell.coordinate.column.title isEqualToString:@"BLine. Start"]){
        textCell.textField.text = cellDataObj.baselineDate;
    }
}

有什么建议吗?

这是CheckBoxPressed方法:

- (void)CheckBoxPressed:(UIButton *)sender
{
    CellData *cell = [cellHolder objectAtIndex:sender.tag];

    if([cell selected] == YES)
    {
        [[cell actualDate]setString:@""];
        [[cell finishedDate] setString:@""];
        [cell setSelected:NO];
    }
    else
    {
        if(([[cell actualDate] isEqualToString:@""]) && ([[cell finishedDate] isEqualToString:@""]))
        {
            [[cell actualDate]setString:[NSString stringWithFormat:@"%@ 8:00:00 AM",[self SetSpecialDateFormat:[NSDate date]]]];
            [[cell finishedDate]setString:[NSString stringWithFormat:@"%@ 4:00:00 PM",[self SetSpecialDateFormat:[NSDate date]]]];
        }
        //actual date not populated but finish date populated
        else if(([[cell actualDate]isEqualToString:@""]) && !([[cell finishedDate] isEqualToString:@""]))
        {
            [[cell actualDate]setString:[cell finishedDate]];
        }
        //finish date not populated but actual date populated
        else if(!([[cell actualDate] isEqualToString:@""]) && ([[cell finishedDate] isEqualToString:@""]))
        {
            [[cell finishedDate]setString:[cell actualDate]];
        }

        [cell setSelected:YES];

    }
    [self UpdateEdittedCells:cell];
    [self SetDisplayHolder];

    //refresh grid
    [gridReference reload];
}

1 个答案:

答案 0 :(得分:1)

(这并不完全清楚你在这之后会产生什么样的影响,所以我假设你想要一个填充了复选框的列,可以根据复选框进行检查或取消选中到您的数据模型)

您遇到的问题是shinobi数据网格重新使用单元格,以优化内存使用情况。因此,向单元格添加按钮将意味着在重新使用单元格时(重新加载或滚动网格时)按钮将在那里。

可以删除X-Amz-Server-Side-Encryption-Customer-Key-MD5开头的单元格内容,然后您可以添加一个空单元格来添加按钮:

prepareCellForDisplay:

但是,这不是最佳方法。

- (void)shinobiDataGrid:(ShinobiDataGrid *)grid prepareCellForDisplay:(SDataGridCell *)cell { if([cell.coordinate.column.title isEqualToString:@"selected"]){ NSArray *cellSubviews = [cell.subviews copy]; for (UIView *subview in subviews) { [subview removeFromSuperview]; } // Now safe to add the button } } 列创建自定义单元子类会更好。这个单元格总是有一个按钮,因此可以更好地利用单元重用机制。

要执行此操作,请创建selected的子类,并按照通常的方式注册网格。然后,当您在SDataGridCell中收到回调时,您知道该类型将是您的自定义类型。

您可以在ShinobiDataGrid用户指南中找到有关实现此目的的具体说明:

https://www.shinobicontrols.com/docs/ShinobiControls/ShinobiGrids/2.8.0/Standard/Normal/docs/markdown_files/DataGridUserGuide.html#How:创建自定义单元格

您正在寻找的示例名为"创建自定义单元格",并且是页面底部的" How-tos"中的最后一个。

此示例附带了一个完整的工作示例,在您下载的dmg的samples文件夹中提供。与示例的不同之处在于它使用的是数据源帮助程序。您的代码不是,但将数据源帮助器的prepareCellForDisplay:方法转换为您习惯使用的populateCell方法非常简单。