搜索栏不刷新UIbutton颜色

Question

这是我的头疼...希望有人吃药。

情况-我有一个搜索栏链接到下面的表格视图-Tableview单元由1个标签和1个按钮组成-该按钮是链接到coredata的“收藏夹”按钮-如果标签文字确实存在于coredata中，则其颜色为棕色-如果文本不存在于coredata中，则其颜色为灰色。如果按下该按钮，它将变成棕色，并且该标签的文本已注册在coredata中]

头痛-一切都非常适合第一次过滤（一切都准备就绪，无论是否注册文本，按钮颜色都会正确显示，并且通过单击按钮进行注册非常完美，但是...-当搜索更改时，将完全（取消）过滤单元格，但不会过滤按钮：应显示为灰色的单元格显示为棕色-如果我更改屏幕并返回所有内容，并且按钮的颜色都可以，就可以了

我找不到在搜索过程中如何刷新按钮标题颜色的方法。 Buttons的标题是文本。有提示吗？

CellForRowAt中的代码

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = searchTbv.dequeueReusableCell(withIdentifier: "searchCell", for: indexPath) as! SearchTbvCell

    if searhing {
        cell.searchLbl.text = mySearch[indexPath.row]
    }
    else {
        cell.searchLbl.text = dataSearch.searchItem[indexPath.row]
    }

    return cell
}

搜索栏的代码

extension SearchVC: UISearchBarDelegate {

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {

    searhing = true

    mySearch = dataSearch.searchItem.filter({$0.lowercased().folding(options: .diacriticInsensitive, locale: .current).prefix(searchText.count) == searchText.lowercased()})

    searchTbv.reloadData()

}

func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
    searhing = false
    searchBar.text = ""
    searchTbv.reloadData()

}

设置按钮颜色的代码（位于自定义单元格类中的代码：

class SearchTbvCell: UITableViewCell {

//MARK: OUTLETS
@IBOutlet weak var searchLbl: UILabel!
@IBOutlet weak var searchBtn: UIButton!

override func awakeFromNib() {
    super.awakeFromNib()
    fetchFromCoreData()
}

override func setSelected(_ selected: Bool, animated: Bool) {
    super.setSelected(selected, animated: animated)
    fetchFromCoreData()
}


@IBAction func favoriteBtnTapped(_ sender: UIButton) {

    // Set fav button color to brown if selected/tapped
    searchBtn.setTitleColor(.brown, for: .normal)

    // Permanently record selection as favorite into coredata
    recordPermanently()
}



//MARK: METHODS

// Fetch contents from CoreData and up-date button's color consequently
func fetchFromCoreData () {
    // Create a reference to container
    let appDelegate = UIApplication.shared.delegate as? AppDelegate
    // Create a context from the container
    let managedContext = appDelegate?.persistentContainer.viewContext
    // Prepare a request and sorting
    let myRequest = NSFetchRequest<NSFetchRequestResult>(entityName: "MyFavorites")
    myRequest.predicate = NSPredicate(format:"favoriteWines = %@", searchLbl.text!)
    do {
        let results = (try managedContext?.fetch(myRequest))!
        for _ in results {
            searchBtn.setTitleColor(.brown, for: .normal)
        }
    }
    catch{}
}


// Record permanently in core data and changethe button's color
func recordPermanently(){
    // Create a reference to container
    guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {return}
    // Create a context from the container
    let managedContext = appDelegate.persistentContainer.viewContext
    // Create an entity to manage records
    let recordEntity = NSEntityDescription.entity(forEntityName: "MyFavorites", in: managedContext)!
    // Create a new record
    let newRecord = NSManagedObject(entity: recordEntity, insertInto: managedContext)
    // Pass values to new record
    newRecord.setValue(searchLbl.text!, forKeyPath: "favoriteWines")
    // Save record
    do {
        try managedContext.save()
        searchBtn.setTitleColor(.brown, for: .normal)
    }
    catch let error as NSError{
        print("Failed to save permanently. \(error), \(error.userInfo)" )
    }
}

}

Answer 1

免责声明：在浏览器中键入，未在Xcode中测试

您尚未指示要设置按钮颜色的位置和方式，但是我建议您在willDisplayCell中进行设置：

func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell,  forRowAt indexPath: IndexPath) {
    if cell.label.text.existsInCoreCata() {
         cell.button.setTitleColor(.brown, for: .normal)
    }
    else {
        cell.button.setTitleColor(.grey, for: .normal)
    }
}

existsInCoreCata()是您的代码，在其中检查标签是否存在于CoreData中。