swift - 如何保存一个整数以在 Swift 中解析

Question

我正在尝试将 integer 值保存到 Parse.com但我收到一个错误。我将 Parse 类中的对象设置为 Number。

这是我的代码:

  if let currentUser = PFUser.currentUser() {

        currentUser.fetchIfNeededInBackgroundWithBlock({ (foundUser: PFObject?, error: NSError?) -> Void in

            // Get and update score

            if foundUser != nil {

                let score = foundUser!["score"] as! Int

                let points = 100 + score

                foundUser!["score"] = points

                foundUser?.saveInBackgroundWithBlock({ (succeeded: Bool, error: NSError?) -> Void in

                    if succeeded {

                        println("score added to user")
                    }
                })

            }

        })

    }

有人可以帮忙吗？

谢谢

Answer 1

发生此错误是因为您将 nil 转换为 Int。

我认为它有效:

if let currentUser = PFUser.currentUser() {

    currentUser.fetchIfNeededInBackgroundWithBlock({ (foundUser: PFObject?, error: NSError?) -> Void in

        // Get and update score

        if let foundUser = foundUser {
            if let score = foundUser["score"] as? Int {
                foundUser["score"] = 100 + score
            } else {
                foundUser["score"] = 0
            }

            foundUser.saveInBackgroundWithBlock({ (succeeded: Bool, error: NSError?) -> Void in

                if succeeded {

                    println("score added to user")
                }
            })

        }
    })
}