Question

    class ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource,UISearchBarDelegate,UISearchDisplayDelegate{

@IBOutlet weak var recipeTable: UITableView!

// search functionality
@IBOutlet weak var searchbarValue: UISearchBar!

var isSearching = false

func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
    isSearching = true
}

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

    filteredRecipes.removeAll()
    if let searchText = searchBar.text, !searchText.isEmpty {
        self.filteredRecipes = self.recipes.filter { recipe in
            guard let ingredients = recipe.ingredients else { return false }
            return ingredients.contains { $0.range(of: searchText, options: .caseInsensitive) != nil }
        }
    } else {
        self.filteredRecipes = self.recipes

    }

    recipeTable.reloadData();
    recipeTable.reloadInputViews();
    searchBar.resignFirstResponder()
}




//end search parameters


// tableview functionionalitys
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    if isSearching == true{
        return filteredRecipes.count
    }else{
        return recipes.count
    }

}


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

    let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! RecipeTableViewCell
   if isSearching == true {
        cell.recipeLabel.text = self.filteredRecipes[indexPath.row].title


    }else{

        cell.recipeLabel.text = recipes[indexPath.row].title

    }
    return cell

}


// structs for json
struct Root : Decodable {
    let count : Int
    let recipes : [Recipe]
}

struct Recipe : Decodable { // It's highly recommended to declare Recipe in singular form
    let recipeId : String
    let imageUrl, sourceUrl, f2fUrl : URL
    let title : String
    let publisher : String
    let socialRank : Double
    let page : Int?
    let ingredients : [String]?
}

//recipes is array of Recipes
var recipes = [Recipe]() // array of recipes

//unfiltered recipes to put into search
var filteredRecipes = [Recipe]()




fileprivate func getRecipes() {

    let jsonURL = "https://www.food2fork.com/api/search?key=5eab2ddd88c29929467a3bb69a182070"
    //.data(using: .utf8)!



    guard let url = URL(string: jsonURL) else{return}

    URLSession.shared.dataTask(with: url) {(data, response , err) in
        if let response = response as? HTTPURLResponse, response.statusCode != 200 {
            print(response.statusCode)
            return
        }
        DispatchQueue.main.async {

            if let err = err{
                print("failed to get data from URL",err)
                return
            }
            guard let data = data  else{return}
            //print(String(data: data, encoding: .utf8))
            do {
                let decoder = JSONDecoder()
                decoder.keyDecodingStrategy = .convertFromSnakeCase
                let result = try decoder.decode(Root.self, from: data)
                self.recipes = result.recipes
                //print(result.recipes)
                self.recipeTable.reloadData()
            }catch let jsonERR {
                print("Failed to decode",jsonERR)
            }
        }

        }.resume()

}



override func viewDidLoad() {

    super.viewDidLoad()

    //search functionalities



    //call json object
    getRecipes()
}

}

在我的Tableview CellforRowAt中，我在else语句中遇到了线程错误，我不确定它从哪里来。昨晚所有功能都在该函数中运行，但是今天早晨运行时，它将不会超出此错误。我允许任意负荷等。在失眠中解析JSON时，我没有收到错误403。

 cell.recipeLabel.text = recipes[indexPath.row].title  
 Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value

处理JSON到TABLEVIEW中的线程错误

0 个答案: