迅捷-CoreData刷新表視圖

Question

我有一個用於顯示產品的表格視圖和一個用於添加新產品的視圖。

在AddProductViewController中，將產品數據添加到coredata后，我關閉了控制器並返回到我的ProductTableView。

navigationController!.popViewControllerAnimated(true)

在ProductTableView中，我添加了refreshcontroller

    override func viewDidLoad() {
            super.viewDidLoad()
            product = fetchProducts()
            refreshControl = UIRefreshControl()
            refreshControl?.addTarget(self, action: "refreshProducts", forControlEvents: UIControlEvents.ValueChanged)
            refreshControl?.beginRefreshing()
    }

    func refreshProducts(){
            product = fetchProducts()
    }

    func fetchProducts() -> [Product] {
            let request = NSFetchRequest(entityName: "Product")

            let sortDescriptor = NSSortDescriptor(key: "productName", ascending: true)
            request.sortDescriptors = [sortDescriptor]

            let product = (try! context!.executeFetchRequest(request)) as! [Product]

            self.view.hideLoading()
            self.refreshControl?.endRefreshing()

            return product
    }

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        self.refreshControl?.beginRefreshing()
        self.tableView.reloadData()
    }

我所擁有的是：
1.關閉第二個ViewController后，不會刷新Tableview
2.有一個凍結的刷新圖標。
3.當我啟動我的應用程序時，我的刷新輪在旋轉並且沒有消失。

Answer 1

override func viewDidLoad() {
        super.viewDidLoad()
        refreshControl = UIRefreshControl()
        refreshControl?.addTarget(self, action: "refreshProducts", forControlEvents: UIControlEvents.ValueChanged)
}

func refreshProducts(){
        product = fetchProducts()
        self.tableView.reloadData()
}

func fetchProducts() -> [Product] {
        let request = NSFetchRequest(entityName: "Product")

        let sortDescriptor = NSSortDescriptor(key: "productName", ascending: true)
        request.sortDescriptors = [sortDescriptor]

        let product = (try! context!.executeFetchRequest(request)) as! [Product]

        self.view.hideLoading()
        self.refreshControl?.endRefreshing()

        return product
}

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    self.refreshControl?.beginRefreshing()
    refreshProducts()
}