如何通过再次点击所选按钮取消选择多个UITableview单元格

Question

嗨，我想选择多个UITableViewCells并通过再次点击取消选择。

以下是didSelectRowAtIndexPath：和cellForRowAtIndexPath：

的代码

-(UITableViewCell *)tableView:(UITableView *)tableView 
   cellForRowAtIndexPath:(NSIndexPath *)indexPath
   {
NSString *cellIdentifier = @"serviceTypeSelectionCell";
ServiceTypeSelectionTableViewCell *serviceTypeCell = (ServiceTypeSelectionTableViewCell *)[tableView dequeueReusableCellWithIdentifier:cellIdentifier];  
if (serviceTypeCell == nil)
{
    serviceTypeCell = [[ServiceTypeSelectionTableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
//serviceDetailsCell.noOfQuantityTextField.tag = indexPath.row;
serviceTypeCell.serviceTypeNameLabel.text = [NSString stringWithFormat:@"%@",arrayOfServiceTypes[indexPath.row][@"sub_cat_name"]];

if([[arrayOfSelectedBoolValues objectAtIndex:indexPath.row] boolValue])
{
    serviceTypeCell.serviceTypeImageView.image = [UIImage imageNamed:@"cancellation_reason_correct_icon"];
}
else {
    serviceTypeCell.serviceTypeImageView.image = [UIImage imageNamed:@"cancellation_reason_unselect_icon"];
}
return serviceTypeCell;
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
for (int i = 0; i < [arrayOfServiceTypes count]; i++)//Make all Rows To UnSelected
{
   [arrayOfSelectedBoolValues replaceObjectAtIndex:i withObject:[NSNumber numberWithBool:NO]];
}
[arrayOfSelectedBoolValues addObjectsFromArray:sele:indexPath.row];
if(arrayOfSelectedBoolValues!=nil)
{
    [arrayOfSelectedBoolValues replaceObjectAtIndex:indexPath.row withObject:[NSNumber numberWithBool:YES]];
}

    [arrayOfSelectedBoolValues replaceObjectAtIndex:indexPath.row withObject:[NSNumber numberWithBool:YES]];
{
[self.tableView reloadData];
[self showOrHideAddButton];
}

我有一个单独选择和取消选择上述uitableview的现有代码。我只能通过禁用所有上述代码来获得多项选择，并将此部分保留在didSelectRowAtIndexPath中：。

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
 [arrayOfSelectedBoolValues replaceObjectAtIndex:indexPath.row withObject:[NSNumber numberWithBool:YES]];
    [self.tableView reloadData];
    [self showOrHideAddButton];
}

- (void)viewDidLoad {
    [super viewDidLoad];

    self.doneButton.hidden = YES;
    arrayOfSelectedBoolValues = [[NSMutableArray alloc]init];

    for (int i = 0; i < [arrayOfServiceTypes count]; i++)
    {
        // [arrayOfexpOrCollBoolValues addObject:[NSNumber numberWithBool:NO]];
        [arrayOfSelectedBoolValues addObject:[NSNumber numberWithBool:NO]];
    }
    [self sendServiceToGetServiceTypes];
}

所以请任何人根据我的代码发布结构化代码，以选择多个tableviewcells，并在将所选值发送到服务器之前再次点击取消选择任何单元格。

先谢谢。

Answer 1

你需要这样做：

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{ 
/// first run a loop for deselect all data
//Make all Rows To UnSelected
for (int i = 0; i < [arrayOfServiceTypes count]; i++)
{
   [arrayOfSelectedBoolValues replaceObjectAtIndex:i withObject:[NSNumber numberWithBool:NO]];

}

Now which one you have selected you need to do like this:

[arrayOfSelectedBoolValues replaceObjectAtIndex:indexPath.row withObject:[NSNumber numberWithBool:YES]];

[self.tableView reloadData];

}

我希望它能帮到你解决问题。

Answer 2

您需要维护一个您选择的行数组，具体取决于您将选择一行还是取消选择行（如果该行已存在）。看起来像这样：

Swift 3代码：

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="*" />
        <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>
    <Grid Grid.Row="0">
        // Normal content
    </Grid>
    <Grid Grid.Row="1">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
        <Button Grid.Column="0" Text="Twitter" />
        <Button Grid.Column="1" Text="Facebook" />
    </Grid>
</Grid>

对象代码：

var selectedArray : [IndexPath] = [IndexPath]()

override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let myCell = tableView.cellForRow(at: indexPath) as! TableCell

    if(!selectedArray.contains(indexPath))
    {
        selectedArray.append(indexPath)
        // Change cell image for selected if needed here.
    }
    else
    {
        // remove from array here if required
        // Change cell image for un selected if needed here.
    }
}

在.h文件中声明- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { . . . if(![selectedArray containsObject:indexPath]) { [selectedArray addObject:indexPath]; // Change cell image for selected if needed here. } else { [selectedArray removeObject:indexPath]; // remove from array here if required // Change cell image for un selected if needed here. } . . . } （在界面中）并在selectedArray中初始化，如此 - viewDidLoad

Answer 3

尝试修改didSelectRowAtIndexPath，如

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

{
    if (_selectedIndexes == nil) {
        self.selectedIndexes = [NSMutableArray array];
    }
    if ([_selectedIndexes containsObject:indexPath]) {
        [_selectedIndexes removeObject:indexPath];

    } else {
        [_selectedIndexes addObject:indexPath];

    }
     [self.tableView reloadData];
       [self showOrHideAddButton];

    }

在cellForRowAtIndexPath尝试修改代码以更改serviceTypeImageView图片，如

if([_selectedIndexes containsObject:indexPath])
    {
        serviceTypeCell.serviceTypeImageView.image = [UIImage imageNamed:@"cancellation_reason_correct_icon"];
    }
    else {
        serviceTypeCell.serviceTypeImageView.image = [UIImage imageNamed:@"cancellation_reason_unselect_icon"];
    }

此处selectedIndexes是一个可变数组，用于跟踪所选的indexPaths

@property(nonatomic, strong) NSMutableArray *selectedIndexes;