Question

I just implemented a filtering mechanism in my UICollectionView and I think this is not the correct methodology I should have chosen.

How can I improve my code to make it have better performance?

I have a screen where you input your criterias for filtering, and then this code handles the rest:

extension ProductsCollectionViewController
{
    @objc func Filter()
    {
        performSegue(withIdentifier: "segue_to_filter_view", sender: self)
    }

    @IBAction func unwindFromFilterScreenAccept(segue: UIStoryboardSegue)
    {
        if segue.source is FilterViewController
        {
            if let senderVC = segue.source as? FilterViewController
            {
                if senderVC.chosenCategory != "" {categoryFilter = senderVC.chosenCategory}
                self.areFiltersSet = true
            }
        }

        self.tabBarController?.tabBar.isHidden = false

        self.products.removeAll()
        self.LoadProducts(productsToShow: pageType)
        //self.LoadProducts(productsToShow: pageType)

    }

    @IBAction func unwindFromClearAllFilters(segue: UIStoryboardSegue)
    {
        ClearAllFilters()
        self.products.removeAll()
        self.LoadProducts(productsToShow: pageType)
    }

    private func ClearAllFilters()
    {
        areFiltersSet = false
    }

    private func FilterProduct(prod: Product) -> Bool
    {
        if areFiltersSet == false {return true}
        return FilterProductByCategory(prod:prod) && FilterProductByLocation(prod:prod) && FilterProductByCondition(prod:prod)
    }

Also:

I have a search bar implemented. Will the two work together? Is there a way to properly integrate the two?

P.S:

The Filtering itself is checked when adding a product to the collection when loading products.

Answer 1

通过执行搜索过滤不是最好的方法。最好根据您选择的过滤器更新collectionView本身。例如，如果您有对应于特定类别的产品，则可以执行以下操作：

let products = [Product(category: "one"), Product(category: "one"), Product(category: "two")]
let foo = products.filter {$0.category == "one"}

该过滤器功能将仅返回与类别一对应的产品。然后，您可以使用过滤后的数组填充collectionView。

关于searchBar，是的，它们将与任何其他过滤器功能一起使用。基本上，您将只执行两个过滤器：

基于类别属性
基于您输入的子字符串

仅供参考，如果将searchBar添加为collectionViewCell或标头，则必须重新加载带有indexPaths的项，因为reloadData()将使searchBar退出响应者。

还有一点，作为建议，通常的做法是使用小写字母-> filter（）而不是Filter（）来命名您的方法。

The correct methodology for UICollectionView filtering

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