supertommy / craft Goto Github PK

    /**
     * Called when the spinner animates
     */
    func refresh(sender:AnyObject)
    {
        println("DataViewController.refresh() : begin")
            API.retrievePosts().then({(value: Value) -> Value in
                dispatch_async(dispatch_get_main_queue()) {
                    self.data += ["It", "Does", "Work"]
                    self.tableView.reloadData()
                    self.refreshControl.endRefreshing()
                }
                println("DataViewController.refresh() : data successfully refreshed")
                return nil
            }, reject: {(value: Value) -> Value in
                dispatch_async(dispatch_get_main_queue()) {
                    self.refreshControl.endRefreshing()
                    self.setMessage(NSLocalizedString("loading_posts_failed", comment: "text saying that posts could not be loaded"))
                }
                println("DataViewController.refresh() : Error while refreshing data : \(value)")
                return nil
            })
// if I wait 3 seconds with the method below instead, the UI does not block
//        var delayInSeconds = 3.0;
//        var popTime = dispatch_time(DISPATCH_TIME_NOW, Int64(delayInSeconds * Double(NSEC_PER_SEC)));
//        dispatch_after(popTime, dispatch_get_main_queue()) { () -> Void in
//            // When done requesting/reloading/processing invoke endRefreshing, to close the control
//            self.refreshControl!.endRefreshing()
//        }
        println("refreshing")
        return
    }

    public static func retrievePosts() -> Promise {
        ++j
        return Craft.promise({(resolve: (value: Value) -> (), reject: (value: Value) -> ()) -> () in
            sleep(3)
            if self.j % 3 == 0 {// fails once every 3 attempt
                reject(value: "Network failure")
            } else {
                resolve(value: nil)
            }
        })
    }