Question

我目前正在使用firebase来检索用户信息。一旦我收到数据，我想在所有闭包之外使用数据，我创建一个完成块，问题是我无法将结果变量添加到结果中，因为结果在另一个闭包内。如何解决这个问题。提前感谢您的帮助。

 func userInfo(userId:String,completion:(result:String)->Void){


        fireBaseAPI().childRef("version_one/frontEnd/users/\(fireBaseAPI().currentUserId()!)/email").observeEventType(.Value, withBlock: {snapshot in

            let email = snapshot.value as! String

            //this is incorrect because it is inside a firebase closure how can I make it work I know i have it outside the closure but i will not be able to retrieve the info from firebase
            result = email

        })




    }

Answer 1

据我了解你的问题:: ---

您想要在检索到 completionBlock：时发送用户的emailID，但我仍然不知道fireBaseAPI()是什么： -

func userInfo(userId:String,completion:((result:String)->Void){
fireBaseAPI().childRef("version_one/frontEnd/users/\(fireBaseAPI().currentUserId()!)/email").observeEventType(.Value, withBlock: {snapshot in

        let email = snapshot.value as! String
        completion(result:email)
    })
}

Answer 2

您可以在类中创建一个变量（在闭包之外），然后将snapshot.value结果存储在该变量中，如下所示：

修改

var emailResult: String? func getUserEmail { fireBaseAPI().child("version_one/frontEnd/users/\(fireBaseAPI().currentUserId()!)/email").observeEventType(.Value, withBlock: {snapshot in let email = snapshot.value as! String self.emailResult = email }) }

Firebase和完成处理程序

2 个答案: