Question

我使用collectionCell在collectionCell上选择和取消选择图片。 但是当我点击选定的单元格时，它将不会被取消选择。

我根据Nirav Suggestion更改了我的代码，它适用于当前视图，但是当我通过传递某个对象来自另一个视图时，那些对象应该被标记为已选中。如果我单击选中的标记对象，则不会取消选择该单元格。

我的代码

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{

BICollectionCell *cell = (BICollectionCell *)[self.collectionView dequeueReusableCellWithReuseIdentifier:@"BICollectionCell" forIndexPath:indexPath];

CustVehiclesList *objCustVehiclesList =self.array_VehicleServicesList[indexPath.row];
[cell.labelMake setText:objCustVehiclesList.make];
[cell.lblLicense setText:objCustVehiclesList.licencePlateNo];

if (objCustVehiclesList.vehiclePicture == nil ||[objCustVehiclesList.vehiclePicture isEqualToString:@""])
{
    [cell.imageCarsView setImage:[UIImage imageNamed:@"placeholder.png"]];
}
else
{
    NSString *baseString = [NSString stringWithFormat:@"%@",objCustVehiclesList.vehiclePicture];
    NSData* imageData = [[NSData alloc] initWithBase64EncodedString:baseString options:0];
    UIImage *imageToDisplay = [UIImage imageWithData:imageData];
    [cell.imageCarsView setImage:imageToDisplay];
}

[cell setSelected:YES];
[self.collectionView selectItemAtIndexPath:indexPath animated:NO scrollPosition:UICollectionViewScrollPositionNone];

if (self.selectedIndexPath == indexPath)
{
    [cell.imgSelectedImage setImage:[UIImage imageNamed:@"vs_tick.png"]];
}
else
{
    [cell.imgSelectedImage setImage:nil];
}

if ([objCustVehiclesList.modelName isEqualToString:self.str_ModelName] && _isCalledFromDetailVC)
{
    [cell.imgSelectedImage setImage:[UIImage imageNamed:@"vs_tick.png"]];
}


if (indexPath.row == self.indexPathToBeSearch.row && self.isCalledFromVehicleVC)
{
    [cell.imgSelectedImage setImage:[UIImage imageNamed:@"vs_tick.png"]];
}


return cell;
}

Answer 1

如果您想要在选择单元格时更改图像，并且如果已选择单元格并且您想要deselect它，那么您可以像这样更改代码

首先像这样创建一个实例属性selectedIndexPath

@property NSIndexPath *selectedIndexPath;

之后更改您的cellForItemAtIndexPath就像这样

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

    BICollectionCell *cell = (BICollectionCell *)[self.collectionView dequeueReusableCellWithReuseIdentifier:@"BICollectionCell" forIndexPath:indexPath];
    [cell setSelected:YES];
    [self.collectionView selectItemAtIndexPath:indexPath animated:NO scrollPosition:UICollectionViewScrollPositionNone];
    if (self.selectedIndexPath == indexPath || ([objCustVehiclesList.modelName isEqualToString:self.str_ModelName] && _isCalledFromDetailVC) || (indexPath.row == self.indexPathToBeSearch.row && self.isCalledFromVehicleVC)) {
        [cell.imgSelectedImage setImage:[UIImage imageNamed:@"vs_tick.png"]];
    }
    else {
        [cell.imgSelectedImage setImage:nil];
    }
    <----Label Values--->
    return Cell;
}

现在在didSelectItemAtIndexPath检查已经selected这样的单元格

-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
    if (self.isCalledFromVehicleVC || self.isCalledFromDetailVC)
    {
     self.isCalledFromVehicleVC = NO;
     self.isCalledFromDetailVC = NO;
    }
    if (self.selectedIndexPath == indexPath) {
        [collectionView deselectItemAtIndexPath:indexPath animated:YES];
        self.selectedIndexPath = nil;
    }
    else {
        self.selectedIndexPath = indexPath;
    }        
    [self.collectionView reloadData];
}

注意 - 删除didDeselectItemAtIndexPath方法，现在不需要这样做。

UICollectionView CustomCell-无法取消选择已选择的单元格

1 个答案: