ios - 计算解析类中的对象数量并将其分配给变量

Question

我想检索类中对象的数量，然后在角标(Badge)上显示该数字。

问题是，如果我写 self.totalMessagesInMesagesCount = count 我收到此错误:无法分配“Int32”类型的值？将该变量分配给 applicationIconBadgeNumber

时，设置为“Int”类型的值

所以我有:

var totalMessagesInMesagesCount : Int!

然后:

//MARK: this requires permission for notifications
        UIApplication.sharedApplication().registerUserNotificationSettings(UIUserNotificationSettings(forTypes: UIUserNotificationType.Sound | UIUserNotificationType.Alert |
            UIUserNotificationType.Badge, categories: nil
            ))
        //MARK: this sets the number displayed in the red badge
        UIApplication.sharedApplication().applicationIconBadgeNumber = totalMessagesInMesagesCount

最后我想检索该数字并将其放入变量中

func loadMessagesByObjectData() {

        var findTimeLineDataQuery = PFQuery(className: KeyWords.ParseClassForPublicMessages)

        findTimeLineDataQuery.countObjectsInBackgroundWithBlock {
            (count: Int32, error: NSError?) -> Void in
            if error == nil {
                print("there are \(count) messages")
self.totalMessagesInMesagesCount = //what? count is not working

            }
        }


    }

提前致谢

Answer 1

听起来变量 totalMessagesInMesagesCount 来自类型 Int，而变量 count 是 Int32 类型。很简单，通过像这样的转换来解决它:

    self.totalMessagesInMesagesCount = Int(count)