单击后如何关闭突出显示的 UICollectionViewCell？

Posted 2023-03-14

【中文标题】单击后如何关闭突出显示的 UICollectionViewCell？

【英文标题】：How to dismiss highlight UICollectionViewCell after clicked?

【发布时间】：2018-05-22 12:09:32

【问题描述】：

我在 ViewController A 中应用了这些代码。单击 UICollectionViewCell 后，它将推送到 ViewController B。如果返回 ViewController A，我如何关闭突出显示的单元格？

- (void)collectionView:(UICollectionView *)collectionView didHighlightItemAtIndexPath:(NSIndexPath *)indexPath

    UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
    cell.contentView.backgroundColor = ThemeLightGrayColor;
    [collectionView deselectItemAtIndexPath:indexPath animated:NO];

更新：-

请找到以下代码（didselectItemAtIndexPath 和 cellForItemAtIndexPath）供您参考：-

- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath 
    [collectionView deselectItemAtIndexPath:indexPath animated:YES];
    if (indexPath.section == 0) 
    
        _productID = [_aryWishlist[indexPath.row]valueForKey:@"product_id"];

       dispatch_sync(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^
            NSString *url_string2 = [NSString stringWithFormat: @"http://api.XXX.com/api/product/product_details/%@",_productID];
            NSData *data2 = [NSData dataWithContentsOfURL: [NSURL URLWithString:url_string2]];
            productDetailsAry = [NSJSONSerialization JSONObjectWithData:data2 options:kNilOptions error:&error];

        );

        Product_ViewController *prodVC = [[Product_ViewController alloc] init];

        [self.navigationController pushViewController:prodVC animated:YES];
    
    else
    
    


- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath 
    UICollectionViewCell *gridcell = nil;
        if(_aryWishlist.count > 0)
        
            WishlistCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:WishlistCellID forIndexPath:indexPath];

                [cell.sameButton setTitle:[_aryWishlist [indexPath.row]valueForKey:@"condition"] forState:UIControlStateNormal];
                if([[_aryWishlist[indexPath.row]valueForKey:@"price_discount"] isEqual:@""])  //No Price Discount

                

                cell.removeWishlistClick = ^

                    NSString *url_string = [NSString stringWithFormat: @"http://api.XXX.com/api/product/wishlist_delete/%@",[_aryWishlist [indexPath.row]valueForKey:@"user_wishlist_id"]];
                    [self.manager DELETE:url_string parameters:nil success:^(NSURLSessionDataTask *task, id responseObject) 

                        [self.collectionView reloadData];
                        [self viewDidLoad];
                    
                                 failure:^(NSURLSessionDataTask *task, NSError *error) 

                                 ];

                ;
            
            gridcell = cell;

        

【问题讨论】：

重新加载collectionview in viewwillappear

嗨 RajeshKumar，试过了，但没有运气，有什么想法吗？

单击单元格时，您推送到 Viewcontroller B 那么为什么要设置单元格的背景颜色？

嗨 Nirav，我的预期结果是在用户按下时突出显示单元格

【参考方案1】：

斯威夫特 4.1

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) 
    collectionView.deselectItem(at: indexPath, animated: true)
    //perform segue

【参考方案2】：

问题是您正在为单元格设置背景颜色，无论它是否被选中。如果您想在选择单元格时使用自定义背景颜色，您有两种选择：

1 - 为具有所需背景颜色的单元格使用自定义视图：

查看UITableView Cell selected Color?

2 - 覆盖单元格中选定属性的设置器。

- (void)setSelected:(BOOL)selected 
    [super setSelected:selected];

    if (selected) 
        self.contentView.backgroundColor = ThemeLightGrayColor;
     else 
        self.contentView.backgroundColor = UIColor.clearColor();
    

然后删除：

cell.contentView.backgroundColor = ThemeLightGrayColor;