在Swift中为Firebase DataStructure创建类

本文介绍了在Swift中为Firebase DataStructure创建类的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我是Firebase的新手，我创建了一个Firebase结构供我使用，基本上我想做的是列出所有用户FirebaseDB.

I am new to firebase, a Firebase structure was created for me to work on, what i want to do basically is to list all users the FirebaseDB.

我想快速创建一个对应的类到下面的firebase数据结构.

I want to create a corresponding class in swift to the firebase data structure below.

"users" : { "A654tdC5uBPoKQzJnpZIpwOfsaJ3" : { "groups" : { "-KZ7fl3I4W7YWuGk6l9k" : true, "-KclzmvvJF54cAg14P92" : true, "-KclzpzrJOhCOWL5_jvw" : true, "-Kcm33N1B_oiVYrQWh3n" : true, "-Kcm3GfRaaGfztEBmflp" : true }, "location" : { "coordinates" : [ 6.59086, 3.3914267 ], "name" : "Oyebanjo Solarin Street, Lagos", "visibility" : true }, "photoUrl" : "pbs.twimg/profile_images/511567946351923201/YBqqKc78_normal.jpeg", "username" : "Kamiye", "visibilityToSelectContacts" : { "contacts" : { "gFTCpzgSJDOsrVKWbAJp0Z1JFXp1" : true, "rRxT6x87kgSjTwZfa7M8ZwzdFkC3" : true }, "visibility" : true } },

这是我尝试过的并且无法正常工作

class LContact { var visibliityToSelectedContacts: VisibilityToSelectContacts? var photoUrl: String? let username: String var location: LALocation? var groudId = [String]() init (value: [String: Any] ) { self.username = value["username"] as! String self.photoUrl = value["photoUrl"] as? String self.location = LALocation(value: value["coordinates"] as? [String:Any] ?? [:]) self.groudId = (value["groups"] as? [String])! } } class VisibilityToSelectContacts { var contacts = [String]() var visibility: Bool init(value: [String: Any]) { self.contacts = [value["contacts"] as! String] self.visibility = value["visibility"] as! Bool } } struct LALocation { var long: Double var lat: Double var address: String! var visibility: Bool! init(long: Double, lat: Double, address: String?, visibility: Bool) { self.long = long self.lat = lat self.address = address self.visibility = visibility } init?(value: [String: Any]) { guard let long = value["0"] as? Double, let lat = value["1"] as? Double else {return nil} self.long = long self.lat = lat self.address = value["name"] as? String self.visibility = value["visibility"] as? Bool } }

推荐答案

让我开始一些可能有用的代码.它不是整个课程，但所有概念都在那里.我还使用了简化的Firebase结构，但是概念仍然相同:

Let me get you going with some code that may help. It's not the entire class but all of the concepts are there. I also am using a simplified Firebase structure, but again, the concepts are the same:

这是Firebase结构

Here's the Firebase structure

users a_uid email: "some email" groups group_1: true group_2: true location coords: "[52.5, 67.1]" name: "Oyebanjo Solarin Street, Lagos" visibility: true username: "some username"

首先，每个用户似乎都有一个位置，这有助于使自己成为一个结构.

First there's appears to be a Location for each user thats lends itself to being a structure.

struct LocationStruct { var coords: String? var name: String? var visibility: Bool? }

然后我们在用户类中使用该结构.在此示例中，我们为单个用户传递快照以初始化类，并对其进行解构以填充类变量.

We then use that structure within our user class. In this example, we pass in a snapshot for a single user to initialize the class and deconstruct it to populate the class variables.

class UserClass { var email = "" var username = "" var groupsDict: [String: Any] var loc = LocationStruct() init(snap: FIRDataSnapshot) { let userDict = snap.value as! [String: Any] self.email = userDict["email"] as! String self.username = userDict["username"] as! String self.groupsDict = userDict["groups"] as! [String: Any] let locationDict = userDict["location"] as! [String: Any] self.loc.coords = locationDict["coords"] as? String self.loc.name = locationDict["name"] as? String self.loc.visibility = locationDict["visibility"] as? Bool } }

这是在单个用户中读取并填充UserClass的代码

Here's the code to read in a single user and populate a UserClass

ref.child("users").child("a_uid") .observeSingleEvent(of: .value, with: { snapshot in let user = UserClass(snap: snapshot) //this code is just to show the UserClass was populated. print(user.email) print(user.username) for group in user.groupsDict { //iterate over groups print(group) //and print each one } print(user.loc.coords!) //print the location data print(user.loc.name!) print(user.loc.visibility!) })

结构中唯一剩下的问题是一个visibleToSelectContacts节点，该节点具有一个子节点联系人.

The only remaining issue in your structure, theres a visibilityToSelectContacts node, which has a child node contacts.

因此，从本质上讲，UserClass中的userDict高层词典将具有一个称为visibleToSelectContacts的子级，然后该子级具有一个具有以下子级词典的子联系人:"gFTCpzgSJDOsrVKWbAJp0Z1JFXp1"值对:true.像这样

So essentially the high level dictionary of userDict in the UserClass will have a child called visibilityToSelectContacts which then has a child contacts which has a child dictionary of key:value pairs of "gFTCpzgSJDOsrVKWbAJp0Z1JFXp1" : true. Like this

userDict visibilityToSelectContacts contacts contant_0: true contant_1: true

我将离开您，让该结构敲定(提示:这是相同的设计模式)

I will leave you to get that structure hammered out (hint: it's the same design pattern)