将FIRDataSnapshot转换为自定义类型 [英] convert FIRDataSnapshot to custom type

问题描述

我试图将一个FIRDataSnapshot转换为自定义类型（即我知道每个孩子
将有一个名称，数字和电子邮件）

I am trying to convert a FIRDataSnapshot to a custom type (i.e. I know that each child will have a Name, Number, and Email )

当我运行下面的代码，每个孩子包含一个名称，数字和电子邮件的JSON树打印到控制台。

When I run the code below, a JSON tree with the each child containing a Name, Number, and Email prints to the console.

因此，我想将快照存储为具有每个属性的自定义类型PersonInfo。这样我可以在我的应用程序中改变这些数据。我需要使用PersonInfo变量我将这些数据存储在我的应用程序的各个部分。

So I want to store the snapshot as a custom type "PersonInfo" that has each of those properties. That way I can alter this data within my app. I need to use the "PersonInfo" variable I store this data into in various parts of my app.

    ref.observeSingleEventOfType(.Value, withBlock: { (snapshot: FIRDataSnapshot) in

        print(snapshot)

    })

推荐答案

您可以定义一个自定义类PersonInfo作为模型。

You can define a custom class PersonInfo that will act as a model.

class PersonInfo: NSObject {
    var pName: String
    var pNumber :String
    var pEmail: String
    let ref: FIRDatabaseReference?

    init( name: String, number: String, email: String) {
        self.pName = name
        self.pNumber = number
        self.pEmail = email
        self.ref = nil
    }

    init(snapshot: FIRDataSnapshot) {
        pName = snapshot.value!["pName"] as! String
        pNumber = snapshot.value!["pNumber"] as! String
        pEmail = snapshot.value!["pEmail"] as! String
        ref = snapshot.ref
    }

    convenience override init() {
        self.init(name:"",number: "", email: "")
    }
}

observeSingleEventOfType 当您有快照时，您可以遍历其子代并获取每个Person：

And inside your observeSingleEventOfType when you have snapshot, you can iterate over its children and fetch each Person as:

for item in snapshot.children{
  var person = PersonInfo(snapshot:item);
  yourList.append(person);
}

因此，您将有一个 PersonInfo 模型对象，您可以稍后访问。

So, you will have a list of PersonInfo model objects that you can access later.

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