Question

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

class toolCollectionViewCell: UICollectionViewCell {

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

}

这两个IBoutlets都链接了故事板中的相应元素。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()
        }

问题是搜索无法正常工作。 搜索结果始终会过滤到收藏视图的第一项。如何更正搜索？你可以download项目。

Answer 1

您忘记更改此方法中的单元格文字：

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
    }

这对图像无效。您必须使用带有食物名称的字典作为键，将图像作为值，或者更好地创建类似带有标题字段和图像字段的类食物。然后用它的标题过滤这个类。

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()        
}

以下是类和图像的工作示例 - Download

UICollection视图中的搜索栏不是搜索结果

1 个答案: