ios - 将 PFObject 查询到 swift 数组中

Question

这是我对数组的初始化:

var restaurantsArray = [String]()

这里是查询函数:

func loadRestaurants(){
    let fetchRestaurantsQuery = PFQuery(className: "Restaurants")
    fetchRestaurantsQuery.findObjectsInBackgroundWithBlock{ (objects: [PFObject]?, error: NSError?) -> Void in
        if error == nil{
            //after successfull fetch
            print("b")
            if let fetchedRestaurants = objects{
                print("c")

                for fetchedRestaurant in fetchedRestaurants{
                    print("a")
                    self.restaurantsArray.append(fetchedRestaurant.objectForKey("Name") as! String)
                    print(fetchedRestaurant.objectForKey("Name") as! String)
                }
            }

        }else{
            // Log details of the failure
            print("Error: \(error!) \(error!.userInfo)")
        }
    }
}

由于某种原因，for 循环中的代码从未被调用。有什么建议可以解决这个问题吗？

Answer 1

自 objects被声明为可选 [PFObject]?正确的可选绑定(bind)语法只是

if let fetchedRestaurants = objects {

和fetchedRestaurant in fetchedRestaurant很奇怪。

for fetchedRestaurant in fetchedRestaurants {