swift - UICollection View 中的搜索栏不是搜索结果

Question

我正在尝试制作可以过滤 UICollectionView 搜索结果的搜索栏。我制作了一个自定义 UICollectionViewCell 类

class toolCollectionViewCell: UICollectionViewCell {

    @IBOutlet weak var imageViewCell: UIImageView!
    @IBOutlet weak var toolTitle: UILabel!

}

这两个IBoutlets都链接 Storyboard中的相应元素。用于将搜索结果过滤到UICollectionView

 func updateSearchResults(for searchController: UISearchController)
        {
            let searchString = searchController.searchBar.text
            filtered = items.filter({ (item) -> Bool in
                let countryText: NSString = item as NSString
                return (countryText.range(of: searchString!, options: NSString.CompareOptions.caseInsensitive).location) != NSNotFound
            })
            collectionView.reloadData()
        }

The problem is that search is not working correctly. Search result always filter to First item of collection view. How to correct the search? you can download the project.

Answer 1

您忘记在此方法中更改单元格文本:

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! toolCollectionViewCell

        //configureCell(cell: cell as! toolCollectionViewCell, forItemAtIndexPath: indexPath as NSIndexPath)
        cell.imageViewCell=cell.viewWithTag(1) as! UIImageView
        if searchActive {
            cell.imageViewCell.image=imageViewArray[indexPath.row]
            cell.toolTitle.text = filtered[indexPath.row]
        } else {
            cell.imageViewCell.image=imageViewArray[indexPath.row]
            cell.toolTitle.text = items[indexPath.row]
        }
        return cell      //return your cell
    }

这不适用于图像。您必须使用以食物名称作为键、图像作为值的字典，或者更好地创建类似带有标题字段和图像字段的类 Food 的内容。然后按标题过滤此类。

我也改变了这个方法:

func updateSearchResults(for searchController: UISearchController) {
     // better way is to use "guard" or "if let searchString = searchString { ... }", 
     // because using searchString! could produce a crash in some cases.
     guard let searchString = searchController.searchBar.text else {
         return
     }

     filtered = items.filter({ (item) -> Bool in
        let countryText: NSString = item as NSString
        return countryText.lowercased.contains(searchString.lowercased())
    })

    collectionView.reloadData()        
}

这是包含类和图像的工作示例 - Download