如何在Swift中保存整数到Parse

Question

我正在尝试将Number值保存到Parse.com但我收到错误。我将Parse类中的对象设置为 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") } }) } }) } 。

这是我的代码：

{{1}}

有人可以帮忙吗？

由于

Answer 1

发生此错误是因为您向Int。

投了一个nil

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")
                }
            })

        }
    })
}

Answer 2

我认为您应该以这种方式将foundUser!["score"]转换为Int：

let score = foundUser?["score"].integerValue

修改

if let currentUser = PFUser.currentUser() {

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

            // Get and update score

            if foundUser != nil {

                if let score = foundUser?["score"].integerValue {
                    let points = 100 + score

                    foundUser!["score"] = points

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

                        if succeeded {

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

        })

    }

希望它会有所帮助。