Question

我有一个项目即将完成。当我将CloudKit记录下载到数组以显示在tableview中时，我的最后一个问题就出现了。这是我的控制器查询部分的代码。

           for result in results!
            {
                let tablerestaurant = Restaurant()
                if let name = result.value(forKey: "Name") as! String? {
                    tablerestaurant.name = name
                }
                // Do same for image
                if let imageAsset = result.object(forKey: "Picture") as! CKAsset? {   
                    if let data = try? Data(contentsOf: imageAsset.fileURL) {
                        tablerestaurant.image =  UIImage(data: data)
                    }
                }
                self.tablerestaurantarray.append(tablerestaurant) // tablerestaurant is an array holding string and image instances of class Restaurant
                self.restaurantArray.append(result) // restaurantArray holds CKRecords to be segued to the next controller 
            OperationQueue.main.addOperation( { () -> Void in
                self.tableView.reloadData()
                self.activity.isHidden = true
            })}

这是我的cellForRowAtIndexPath Tablecell函数，缓存部分与全局数组一起注释

 var tablerestaurantarray: [Restaurant] = []
 let cache = NSCache<NSString, Restaurant>()

-

override func tableView(_ tableView: UITableView, cellForRowAt     indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier:     "restaurantcell") as? RestaurantTableCell


    /////////this is the cache portion//////////////
    var oneRestaurant: Restaurant = tablerestaurantarray[indexPath.row]

    if let cachedVersion = cache.Restaurant(forKey: "image")
        {
            oneRestaurant = cachedVersion
    }
    else
    {
        oneRestaurant = Restaurant()
        cache.setObject(oneRestaurant, forKey: "image")
    }
    //////////////////////////


    let restaurant: Restaurant = tablerestaurantarray[indexPath.row]
    cell?.name?.text = oneRestaurant.name

   // cell?.picture?.image = oneRestaurant.image
    return cell!

我试图从这里https://www.hackingwithswift.com/example-code/system/how-to-cache-data-using-nscache复制这个简单的缓存程序，然后将其转录给我自己使用。但是，调试器声明了

NSCache<NSString, Restaurant> has no member Restaurant

它确实如此。所以我对我的问题感到很沮丧。你有想法吗？

更新2

 var tablerestaurantarray: [Restaurant] = []
 let cache = NSCache<NSString , Restaurant>()


var oneRestaurant: Restaurant = tablerestaurantarray[indexPath.row]


    if let cachedVersion = cache.object(forKey: "image") { } //error is called here
    {
        oneRestaurant = cachedVersion
    }
    else
    {
        oneRestaurant = Restaurant()
        cache.setObject(oneRestaurant, forKey: "image")
    }

使用CloudKit Records首次创建NSCache - 关闭？

0 个答案: